JP5148768B2 - IMAGING DEVICE, IMAGING DEVICE OPERATING METHOD, AND ENDOSCOPE DEVICE - Google Patents

Description

  Embodiments described herein relate generally to a head-separated imaging apparatus, imaging method, and endoscope apparatus in which a head unit that images a subject and a main body unit that processes an image signal transmitted from the head unit are separated.

  In a conventional imaging device, a camera device (head portion) including an image sensor (for example, a charge coupled device (CCD) sensor or a complementary metal oxide semiconductor (CMOS) sensor) that captures an object is a host device (main body portion). When the camera device is used with the camera device detached from the host device, the image signal of the image captured by the camera device is transmitted to the host device by wireless communication, and the camera device is attached to the host device. When used in a state, there is one that transmits an image signal of an image captured by a camera device to a host device by wired communication (for example, Patent Document 1).

JP 2001-28740 A

Some conventional imaging devices store correction data for correcting an image signal of an image captured by an image sensor in a head unit. In such an imaging apparatus, correction data is transferred from the head unit to the main unit after the apparatus is started up. If data communication is switched from wired to wireless or wireless to wired during this transfer, the correction data is transferred from the beginning. I was starting over. For this reason, if the communication is switched during the transmission of the correction data, it is necessary to transfer the correction data once transferred again, resulting in a problem that the convenience for the user is lowered.
The present invention has been made to solve such a conventional problem, and provides an imaging apparatus, an imaging method, and an endoscope apparatus in which data transfer is performed from the continuation of the transferred data even when the communication state is switched. The purpose is to do.

  An imaging apparatus according to an embodiment of the present invention is a head-separated imaging apparatus in which a head unit and a main body unit that processes an image signal transmitted from the head unit are separated, and the head unit includes a rechargeable battery. The main body unit includes a terminal for charging the rechargeable battery of the head unit. When the main unit detects that the head unit is connected to the terminal, the main body unit performs data transmission / reception with the head unit by wired communication.

It is a lineblock diagram of the endoscope apparatus concerning a 1st embodiment. It is a block diagram of a head. It is explanatory drawing of correction data. It is explanatory drawing of the correction method. It is a block diagram of CCU. It is a flowchart which shows operation | movement of an endoscope apparatus. It is a block diagram of the endoscope apparatus which concerns on 2nd Embodiment. It is a block diagram of a head. It is a block diagram of CCU. It is a block diagram of the endoscope apparatus which concerns on 3rd Embodiment. It is a block diagram of a head. It is a block diagram of CCU. It is a flowchart which shows operation | movement of an endoscope apparatus.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
In the first embodiment, the configuration of a head-separated endoscope apparatus will be described as an example of an imaging apparatus. Although an embodiment using a CMOS (Complementary Metal Oxide Semiconductor) sensor as an image sensor (imaging device) will be described, other sensors such as a CCD (Charge Coupled Device) sensor may be used instead of the CMOS sensor.

  FIG. 1 is a configuration diagram of an endoscope apparatus 1 according to the first embodiment. The endoscope apparatus 1 is provided with an objective lens 10a at the tip, and an image signal picked up by a scope 10 to be inserted into a body to be inspected and an image sensor 21 (imaging means) located on an image forming surface of the objective lens 10a. From the head 20 that transmits the image signal by wireless communication or wired communication, the CCU (camera control unit) 30 that processes the image signal transmitted from the head 20, the light source 40 (light source) that exposes the imaging range, and the light source 40 Is provided with an optical fiber 60 for introducing the light into the distal end of the scope 10. The scope 10 is detachably attached to the head 20. The camera cable 50 is a cable for wired communication between the head 20 and the CCU 30 and accommodates a signal line for transmitting and receiving correction data, an image signal, a control signal, and the like.

(Configuration of the head 20)
FIG. 2 is a configuration diagram of the head 20.
The head 20 includes an image sensor 21, a memory 22, a wired communication unit 23, a wireless communication unit 24, a built-in antenna 25, a battery 27, a connection terminal T1, and a charging terminal T2. The image sensor 21 is a three-plate image sensor, and a prism 21a that separates light from the objective lens 10a into three colors of R (Red), G (Green), and B (Blue), and the R, G, and B It is composed of CMOS sensors 21b to 21d that convert color-separated light into electrical signals. The three-plate type image sensor has a characteristic of excellent color reproducibility because it retains RGB information for each pixel. The image sensor 21 is a color image sensor that supports full HD (high definition).

  The image sensor 21 may be a single plate type instead of a three plate type. In a single-plate image sensor, a color filter is provided on each pixel of the CMOS sensor, and an electrical signal output from the CMOS sensor is color-separated into R, G, and B signals by a circuit. Since it is not necessary to bond a prism and a CMOS sensor together, it can be manufactured at low cost. The color filter array includes, for example, a color difference line sequential array, a Bayer array, and the like. However, in the first embodiment, various arrangement methods are not limited to the color difference line sequential array and the Bayer array. it can.

  The memory 22 is an electrically rewritable non-volatile memory (for example, a flash memory), and includes correction data (correction information) and setting conditions (for example, frame rate, gain, sensitivity, etc.), ID ( Identifier) and the like are stored. Note that a memory other than the flash memory may be used as the memory for storing the correction data, the setting conditions, and the like as long as the memory can be rewritten.

(Correction data)
The image sensor 21 includes two types of noise called fixed pattern noise (FPN) and random noise. In the first embodiment, fixed pattern noise correction data (correction information) is stored in the memory 20 in the head 20. Remember. The correction data is transferred from the head 20 to the CCU 30 when the endoscope apparatus 1 is activated, and the image signal transmitted from the image sensor 21 is corrected using the transferred correction data.

  The fixed pattern noise includes a base noise whose level (intensity) does not change depending on the external environment (for example, temperature and luminance), and a defect noise (for example, white scratch and black scratch) whose level changes depending on the external environment. The memory 22 stores the two types of noise correction data. Hereinafter, correction data for each base noise and defect noise will be described.

(Substrate noise correction data)
FIG. 3 is an explanatory diagram of correction data for the base noise.
The base noise always generates a constant noise regardless of the external environment. For this reason, the background noise of the CMOS sensor included in the image sensor 21 is measured in advance for each pixel, and correction data for canceling the background noise is stored in the memory 22 for each pixel as shown in FIG. The base noise correction data is stored in the memory 22 in the order of pixel addresses.

(Correction data for defective pixels)
White scratches, which are defect noises, refer to pixel defects in which pixel data having a value higher than the value that should be output is output, and pixels corresponding to the light receiving element appear white, and are mainly caused by dark current. . The dark current is a weak current that flows even when light is not irradiated in the CMOS sensor, and is mainly generated due to a thermal factor or insulation failure. A large dark current causes image noise.

  Also, the black defect, which is a defect noise, is a pixel defect in which pixel data having a value lower than the value that should be output is output and the pixel corresponding to the light receiving element appears black. It is caused by the dust inside. This dust is a defect that occurs when light incident on the pixel to the CMOS sensor is blocked or the circuit of the CMOS sensor is short-circuited.

  Of all the pixels of the CMOS sensor included in the image sensor 21, addresses at which pixel defects such as white defects and black defects occur are stored in the memory 22 as correction data for the defective pixels. FIG. 4 is an explanatory diagram of a defective pixel correction method. As shown in FIG. 4, the defective pixel is corrected by correcting the image signal of the defective pixel using a value obtained by adding the image signals of the pixels adjacent to the left and right sides of the defective pixel and dividing the result by 2 as a defective pixel image signal.

As described above, the memory 22 stores the following information in the same order as correction data. When the correction data stored in the memory 22 is read, it is read in the same order (1 → 2 → 3).
1: Number of correction data.
2: Correction data (a plurality) of substrate noise.
3: Correction data (plural) of defective pixels.

  The correction data for the background noise stores the correction data for each pixel of the CMOS sensor of the image sensor 21 together with the address in the order of the pixel address, and the correction data for the defective pixel stores the address of the defective pixel in the order of the pixel address. Yes.

  The wired communication unit 23 includes a serializer, an LVDS (low voltage differential signaling) conversion circuit, and the like, and a camera cable in which correction data stored in the memory 22 and an image signal output from the image sensor 21 are connected to the connection terminal T1. 50 to the CCU 30. Also, initialization data (for example, resolution, clock, mode, etc.) transmitted from the CCU 30 described later is received. The image signal is transmitted to the CCU 30 as a digital signal.

  The wireless communication unit 24 transmits the correction data stored in the memory 22 and the image signal output from the image sensor 21 to the CCU 30 via the built-in antenna 25. Also, initialization data transmitted from the CCU 30 described later is received. For wireless communication, for example, a method defined by IEEE802.11a / b / g / n or WirelessHD may be used.

  The transfer control unit 26 transfers data such as correction data and pixel signals to the CCU 30 based on an instruction from the CCU 30.

  The battery 27 is a power source that supplies electric power to each circuit (image sensor 21, memory 22, wired communication unit 23, wireless communication unit 24, built-in antenna 25, transfer control unit 26, etc.) provided in the head 20. The battery 27 is charged by an external power source (for example, an outlet) connected to the charging terminal T2. Note that a power line for supplying power to the head 20 may be accommodated in the camera cable 50, and the battery 27 may be charged by the power supplied via the camera cable 50.

(Configuration of CCU30)
FIG. 5 is a diagram illustrating the configuration of the CCU 30.
A connection terminal T3, a wired communication unit 31, a built-in antenna 32, a wireless communication unit 33, an image signal processing circuit 34, an image output circuit 35, a system control circuit 36, a power supply circuit 37, and a communication establishment determination unit 38 are provided. A camera cable 50 is connected to the connection terminal T3.

  The wired communication unit 31 includes a deserializer and an LVDS conversion circuit (not shown). When the power of the CCU 30 is turned on, the wired communication unit 31 starts establishment of communication with the wired communication unit 23 of the head 20. When the communication is established, the wired communication unit 31 outputs a correction signal transmitted from the head 20 via the camera cable 50. The image signal is output to the system control circuit 36 to the image signal processing circuit 34. The wired communication unit 31 transmits a control signal output from the system control circuit 36 and initialization data described later to the head 20 via the camera cable 50 connected to the connection terminal T3.

  When the power of the CCU 30 is turned on, the wireless communication unit 33 starts establishing communication with the wireless communication unit 24 of the head 20, and when communication is established, the correction signal received by the built-in antenna 32 is sent to the system control circuit 36. The image signal is output to the image signal processing circuit 34. In addition, the wireless communication unit 33 transmits a control signal and initialization data output from the system control circuit 36 to the head 20 via the built-in antenna 32. The wireless communication unit 33 periodically transmits a signal to the wireless communication unit 24 of the head 20 when the wireless communication is established, and the wireless communication unit 24 and the wireless communication maintain the established state.

  The image signal processing circuit 34 includes an image signal processing unit 34a and a synchronization signal generating unit 34b. The image signal processing unit 34 a processes the image signal output from the wired communication unit 31 and outputs the processed image signal to the image output circuit 35. The image signal processing unit 34a rearranges the image signals output from the wired communication unit 31 in the order of pixel addresses, and then reads out from the memory 22 of the head 20 by the MPU 36c described later and stores the correction data in the memory 36a. Correct the image signal.

(Correction of substrate noise)
The image signal processing unit 34a corrects the image signal by rearranging the image signals in the order of addresses and then adding the correction data stored in the memory 36a to the image signal having the same address. Since the correction data stored in the memory 36a by the MPU 36c is created so as to cancel the background noise of the CMOS sensor included in the image sensor 21, the correction signal is added to the image signal at the same address to correct the image signal. be able to.

(Correction of defective pixel noise)
The image signal processing unit 34a recognizes the image signal of the defective pixel from the address of the defective pixel stored in the memory 36a, adds the image signals of the pixels adjacent to the left and right sides of the defective pixel, and divides the value by 2 to obtain the value of the defective pixel. Let it be an image signal. The image signal of the defective pixel is corrected.

  The image signal processing unit 34 a performs enhancement processing such as demosaicing processing, knee correction, gamma correction, detail and matrix processing on the corrected image signal, and inputs the processed image signal to the image output circuit 35.

  The synchronization signal generation unit 34 b generates a synchronization signal used for imaging by the image sensor 21. The synchronization signal is generated at a predetermined interval corresponding to the set frame rate. The generated synchronization signal is output to the MPU 36 c and transmitted from the wired communication unit 31 or the wireless communication unit 33 to the head 20.

  The image output circuit 35 includes a D / A converter 35a and a DVI (digital visual interface) transmitter 35b, and externally converts the image signal processed by the image signal processing circuit 34 as analog and digital RGB (red, green, blue) signals. Output to a monitor (not shown). Instead of the DVI transmitter 35b, an HD-SDI (high definition serial digital interface) transmitter or an HD-DVI (high definition digital visual interface) may be provided.

  The system control circuit 36 includes a memory 36a, an on-screen display (OSD) controller 36b, a micro processing unit (MPU) 36c, a receiving unit 36d, and an operation receiving unit 36e, and controls the entire endoscope apparatus 1. The memory 36a is an electrically rewritable EEPROM. The memory 36a stores setting conditions (for example, exposure period and gain) of the CCU 30, initialization data of the head 20, and the number of initialization data (hereinafter referred to as initialization data number).

  The exposure period is a parameter for adjusting the brightness of an image captured by the image sensor 21, and corresponds to the shutter speed. There may be several types of exposure periods (for example, 1/240 seconds, 1/120 seconds, etc.). The setting of the exposure period can be changed by an external PC (personal computer) or operation keys described later.

  As a memory for storing the setting conditions, a memory other than the EEPROM can be used as long as it can be rewritten. The OSD controller 36b superimposes text data, a bitmap, etc. on the image of the image signal processed by the image signal processor 34a.

  The MPU 36c controls the head 20, the CCU 30, and the light source 40 based on the remote control signal received by the receiving unit 36d, the processing content received by the operation receiving unit, and the setting information stored in the memory 36a.

(Transfer correction data)
Further, the MPU 36c designates whether to transmit by wired communication or wireless communication, and instructs the transfer control unit 26 of the head 20 to transmit the ID and correction data stored in the memory 22 of the head 20. . The MPU 36c stores the ID and correction data transmitted from the transfer control unit 26 of the head 20 in the memory 26a.

  First, the MPU 36c instructs the transfer control unit 26 to transmit the ID stored in the memory 22 of the head 20, and stores the transmitted ID in the memory 36a. Next, the MPU 36c instructs the transfer control unit 26 to transmit the number of correction data stored in the memory 22 of the head 20, and stores the number of correction data to be transmitted in the memory 36a.

  Further, the MPU 36c instructs the transfer control unit 26 to transmit the ground noise correction data and the pixel address from the memory 22 of the head 20, and stores the transmitted ground noise correction data and the pixel address in the memory 36a. To do.

  Next, the MPU 36 c instructs the transfer control unit 26 to transmit defective pixel correction data (pixel address) from the memory 22 of the head 20, and stores the transmitted defective pixel correction data in the memory 36 a of the CCU 30. To do. The MPU 36c stores the read pixel defect noise correction data (defective pixel addresses) in the order of reading, that is, in the order of addresses.

  The MPU 36c increments the value of the built-in counter each time the transmitted correction data is stored in the memory 36a, and the correction data is read when the value of the built-in counter becomes equal to the number of correction data in the memory 36a. Judge that it is finished, reset the value of the built-in counter.

(Transfer initialization data)
The MPU 36 c further transmits initialization data stored in the memory 36 a to the head 20 via the wired communication unit 31 or the wireless communication unit 33. The transmitted initialization data is stored in the memory 22 by the transfer control unit 26. The MPU 36c increments the value of the built-in counter each time the initialization data is read and transferred to the head 20, and when the value of the built-in counter becomes equal to the number of initialization data stored in the memory 36a. It is determined that the initialization data has been transmitted, and the built-in counter value is reset.

  In general, wired communication has a higher communication speed and higher communication stability than wireless communication. Therefore, when both wireless communication and wired communication are established, the MPU 36c gives priority to wired communication. use.

  The receiving unit 36d receives a control signal for remote control transmitted from an external PC or the like and outputs it to the MPU 36c. Note that communication with an external PC is performed via an RS232-C serial port. The operation accepting unit 36e accepts a process operated by an external operation key and outputs it to the MPU 36c. Examples of operations accepted by the operation accepting unit 36e include operations for performing / not performing image signal correction (correction ON / OFF operation), operations for setting a gain value, and the like.

  The power supply circuit 37 converts electric power supplied from the outside into a predetermined voltage and supplies it to each circuit in the CCU 30. The power is also supplied to the head 20 via the camera cable 50 connected to the connection terminal T3.

  The communication establishment determination unit 38 determines whether wired communication and wireless communication are established with the head 20. Various methods can be used for determining communication establishment by the communication establishment determining unit 38. For example, in the first embodiment, LVDS is used when an image signal is transmitted by wired communication. In LVDS, since an image signal is transmitted by a differential signal, whether wired communication is established between the wired communication unit 31 and the wired communication unit 23 of the head 20 based on the presence or absence of a voltage between two transmission paths. You can determine whether or not.

  The communication establishment determination unit 38 outputs a “wired communication establishment signal” to the MPU 36 c of the system control circuit 36 when the wired communication is established from the state where the wired communication is not established. Further, the communication establishment determination unit 38 outputs a “wired communication disconnection signal” to the MPU 36 c of the system control circuit 36 when the wired communication is not established from the state where the wired communication is established.

  When determining communication establishment in wireless communication, for example, data transmission for connection confirmation defined by IEEE802.11a / b / g / n or WirelessHD is performed, and response data from the wireless communication unit 24 of the head 20 ( Whether or not wireless communication is established between the wireless communication unit 33 and the wireless communication unit 24 of the head 20 can be determined from the presence or absence of Ack).

  The communication establishment determination unit 38 outputs a “wireless communication establishment signal” to the MPU 36 c of the system control circuit 36 when the wireless communication is established from the state where the wireless communication is not established. Further, the communication establishment determination unit 38 outputs a “wireless communication disconnection signal” to the MPU 36 c of the system control circuit 36 when the wireless communication is not established from the state where the wireless communication is established.

  The light source 40 includes a lamp and a lens. An optical fiber 60 is connected to the light source 40. The lamp is, for example, a xenon lamp, and emits light for exposing the imaging range of the image sensor 21. The lens introduces light emitted from the lamp into the optical fiber 60. The light introduced into the optical fiber 60 is guided to the distal end portion of the scope 10 and exposes the imaging range of the image sensor 21.

(Operation when the endoscope apparatus 1 is started)
FIG. 6 is a flowchart showing the operation of the endoscope apparatus 1 according to the first embodiment. Hereinafter, the operation of the endoscope apparatus 1 according to the first embodiment will be described with reference to FIG. In the following description, the operation of the endoscope apparatus 1 will be described by taking as an example the case where either wired communication or wireless communication is established. In FIG. 6, the initialization data is transferred after the correction data is transferred. However, the correction data may be transferred after the initialization data is transferred.

(Step S101)
When the power of the CCU 30 is turned on, the MPU 36c resets the image signal processing circuit 34 and the image output circuit 35. The term “reset” here means specifically initialization of video processing settings. The light source 40 causes the lamp to emit light based on a control signal from the MPU 36c. Light from the lamp is introduced into the optical fiber 60 and irradiated from the tip of the scope 10 to expose the imaging range of the image sensor 21.

(Step S102)
The MPU 36c reads the setting conditions (for example, exposure period and gain) of the CCU 30 from the memory 36a, and changes the setting values of the image signal processing circuit 34 and the image output circuit 35 to values read from the memory 36a.

(Step S103)
The wired communication unit 31 of the CCU 30 starts communication with the wired communication unit 23 of the head 20. Further, the wireless communication unit 33 of the CCU 30 starts communication with the wireless communication unit 24 of the head 20. The communication establishment determination unit 38 outputs a “wired communication establishment signal” when communication between the wired communication unit 31 of the CCU 30 and the wired communication unit 23 of the head 20 is established. The communication establishment determination unit 38 outputs a “wireless communication establishment signal” when communication between the wireless communication unit 33 of the CCU 30 and the wireless communication unit 24 of the head 20 is established.

(Step S104)
Based on the “wired communication establishment signal” or “wireless communication establishment signal” output from the communication establishment determination unit 38, the MPU 36c determines whether communication has been established by wire or wireless.

(Step S105)
When the “wired communication establishment signal” or the “wireless communication establishment signal” is output from the communication establishment determination unit 38, the MPU 36c starts acquiring correction data from the memory 22 of the head 20. At this time, if the “wired communication establishment signal” is output from the communication establishment determination unit 38, the MPU 36c instructs the transfer control unit 26 to transmit the correction data from the memory 22 of the head 20 through wired communication. When the “wireless communication establishment signal” is output from the communication establishment determination unit 38, the MPU 36c instructs the transfer control unit 26 to transmit the correction data from the memory 22 of the head 20 through wireless communication.

(Step S106)
First, the MPU 36c instructs the transfer control unit 26 to transmit the ID and the number of correction data, and stores the transmitted ID and the number of correction data in the memory 36a. Next, the MPU 36c instructs the transfer control unit 26 to sequentially transmit the correction data, and stores the transmitted correction data in the memory 36a. At this time, the MPU 36c increments the value of the built-in counter each time one correction data is stored in the memory 22.

(Step S107)
The MPU 36c determines whether or not the correction data stored in step S106 is the last correction data. Specifically, the MPU 36c determines whether or not the value of the built-in counter is the same as the number of correction data stored in the memory 36a.

  If the value of the built-in counter is not the same as the number of correction data stored in the memory 36a (No in step S107), the MPU 36c starts from step S10 until the value of the built-in counter becomes the same as the number of correction data stored in the memory 36a. The operation in step S107 is repeated.

(Step S108)
When the value of the built-in counter is the same as the number of correction data stored in the memory 36a (Yes in step S107), the MPU 36c receives initialization data (for example, resolution, clock, mode, etc.) from the memory 36a. Read out and transmit to head 20. The processed data transmitted to the head 20 is stored in the memory 22 by the transfer control unit 26.

(Step S109)
The MPU 36c increments the value of the built-in counter each time initialization data is transferred.

(Step S110)
The MPU 36c determines whether or not the initialization data transferred in step S108 is the last initialization data. Specifically, the MPU 36c determines whether or not the value of the built-in counter is the same as the number of initialization data stored in the memory 36a.

  If the value of the built-in counter is not the same as the number of initialization data stored in the memory 36a (No in step S110), the MPU 36c steps until the value of the built-in counter becomes the same as the number of initialization data stored in the memory 36a. The operation from S108 to step S110 is repeated.

  When the value of the built-in counter is the same as the number of initialization data stored in the memory 36a (Yes in step S110), the MPU 36c proceeds to the next step.

(Step S111)
The synchronization signal generator 34b generates a synchronization signal and transmits the generated synchronization signal to the head 20 at a predetermined time interval.

(Step S112)
When receiving the synchronization signal transmitted from the synchronization signal generator 34b, the image sensor 21 accumulates charges in the phototransistors for each scanning line, converts the charges accumulated in the phototransistors into voltages, amplifies and reads them. .

(Step S113)
The charge accumulated in each phototransistor of the image sensor 21 is converted into a voltage for each scanning line, amplified and read, and transmitted to the CCU 30 as an image signal.

(Step S114)
The image signal processing unit 34a of the image signal processing circuit 34 rearranges the pixel information with respect to the image signal transmitted from the head 20, and corrects the rearranged image signal. The image signal processing unit 34a corrects the image signal based on the correction data stored in the memory 36a. Further, the image signal processing unit 34 a performs enhancement processing or the like on the corrected image signal and then outputs it to the image output circuit 35.

(Step S115)
The image output circuit 35 outputs the image signal output from the image signal processing unit 34a to an external monitor (not shown) as analog and digital RGB (red, green, blue) signals, and is corrected by the monitor. An image is displayed.

(Operation at the time of data transfer of the endoscope apparatus 1)
Next, the operation at the time of data transfer of the endoscope apparatus 1 according to the first embodiment will be described by dividing it into the following three cases.
Case 1: Wired communication is established after wireless communication is established.
Case 2: When wireless communication is established after wired communication is established.
Case 3: When wireless communication is established after wired communication is established, and then wired communication is disconnected.

(Case 1)
The case 1 will be described. As a situation where wired communication is established after wireless communication is established, for example, after the endoscope apparatus 1 is activated with the camera cable 50 disconnected, the head 20 and the CCU 30 are connected by the camera cable 50. The case is considered.

  In step S103 of FIG. 6, when the wireless communication is established first, the communication establishment determination unit 38 outputs a “wireless communication establishment signal”. The MPU 36c determines that communication has been established wirelessly based on the “wireless communication establishment signal” output from the communication establishment determination unit 38, and instructs the transfer control unit 26 to transmit the ID and the correction data by wireless communication. To do.

  When the communication establishment determination unit 38 outputs a “wired communication establishment signal” when wired communication is established while acquiring ID and correction data by wireless communication, the MPU 36 c is output from the communication establishment determination unit 38. Based on the “wired communication establishment signal”, it is determined that wired communication has been established, and the transfer control unit 26 is instructed to switch communication with the head 20 from wireless communication to wired communication.

The MPU 36c instructs the transfer control unit 26 to transmit the ID by wired communication. The MPU 36c determines whether the ID transmitted from the transfer control unit 26 is the same as the ID acquired when the wired communication is established. When the IDs are the same, the MPU 36c
It is determined how much correction data has been transferred from the value of the built-in counter, and the transfer control unit 26 is instructed to transfer the remaining correction data by wired communication. If the IDs are not the same, the MPU 36c resets the value of the built-in counter and instructs the transfer control unit 26 to transfer the correction data from the beginning.

  In the above description, the operation at the time of transferring the correction data has been described. However, the operation at the time of transferring the initialization data and the image signal is the same. That is, when wired communication is established at the time of transfer of initialization data, the MPU 36c switches the communication with the head 20 from wireless communication to wired communication, and determines how far the initialization data has been transferred from the value of the built-in counter. Transfer the remaining initialization data via wired communication. If wired communication is established when the image signal is transferred, the MPU 36c instructs the transfer control unit 26 to switch the communication with the head 20 from wireless communication to wired communication and transmit the image signal by wired communication.

(Case 2)
The case 2 will be described. As a situation where the wireless communication is established after the wired communication is established, for example, the case where the endoscope apparatus 1 is activated with the camera cable 50 attached can be considered. Usually, since the communication speed of wired communication is faster than that of wireless communication, when the endoscope apparatus 1 is activated with the camera cable 50 attached, it is considered that wired communication is established first.

  In step S103 of FIG. 6, when the wired communication is established first, the communication establishment determining unit 38 outputs a “wired communication establishment signal”. Based on the “wired communication establishment signal” output from the communication establishment determination unit 38, the MPU 36c determines that communication has been established by wire, and instructs the transfer control unit 26 to transmit ID and correction data by wire communication. . When wireless communication is established while transmitting ID and correction data by wired communication, the communication establishment determination unit 38 outputs a “wireless communication establishment signal”.

  The MPU 36c determines that communication is established wirelessly based on the “wireless communication establishment signal” output from the communication establishment determination unit 38. However, the wired communication has a higher communication speed than the wireless communication, and the communication Since the stability is high, the MPU 36c does not switch the communication and continues the correction data while maintaining the wired communication.

  In the above description, the operation at the time of transferring the correction data has been described. However, the operation at the time of transferring the initialization data and the image signal is the same. That is, even when wireless communication is established at the time of transfer of initialization data or image signal, transfer of the remaining initialization data or image signal is continued without changing the communication, without changing the communication.

(Case 3)
The case 3 will be described. As a situation in which wireless communication is established after wired communication is established and then wired communication is interrupted, for example, the endoscope apparatus 1 is activated with the camera cable 50 attached, and then the camera cable 50 is connected. It can be removed.

  In step S103 of FIG. 6, when the wired communication is established first, the communication establishment determining unit 38 outputs a “wired communication establishment signal”. Based on the “wired communication establishment signal” output from the communication establishment determination unit 38, the MPU 36c determines that communication has been established by wire, and instructs the transfer control unit 26 to transmit ID and correction data by wire communication. . When wireless communication is established while transmitting ID and correction data by wired communication, the communication establishment determination unit 38 outputs a “wireless communication establishment signal”.

  The MPU 36c determines that communication is established wirelessly based on the “wireless communication establishment signal” output from the communication establishment determination unit 38. However, the wired communication has a higher communication speed than the wireless communication, and the communication Since the stability is high, the MPU 36c continues to transfer the remaining correction data while maintaining the wired communication without switching the communication.

  Thereafter, when the camera cable 50 is removed during the transfer of the correction data, the communication establishment determination unit 38 detects the disconnection of the wired communication and outputs a “wired communication disconnection signal”. The MPU 36c determines that the wired communication has been disconnected based on the “wired communication disconnection signal” output from the communication establishment determination unit 38, and switches the communication with the head 20 from the wired communication to the wireless communication.

  After switching the communication, the MPU 36c instructs the transfer control unit 26 to transmit the ID by wireless communication. The MPU 36c determines whether the ID transmitted from the transfer control unit 26 is the same as the ID acquired when the wired communication is established. If the IDs are the same, the MPU 36c determines how far the correction data has been transferred from the value of the built-in counter, and instructs the transfer control unit 26 to transfer the remaining correction data by wireless communication. If the IDs are not the same, the MPU 36c resets the value of the built-in counter and instructs the transfer control unit 26 to transfer the correction data from the beginning.

  In the above description, the operation at the time of transferring the correction data has been described. However, the operation at the time of transferring the initialization data and the image signal is the same. That is, when the wired communication is disconnected during the transfer of the initialization data, the MPU 36c switches the communication with the head 20 from the wired communication to the wireless communication, and determines how far the initialization data has been transferred from the value of the built-in counter. The remaining initialization data is transmitted by wireless communication. If the wired communication is disconnected during the transfer of the image signal, the MPU 36c instructs the transfer control unit 26 to switch the communication with the head 20 from the wired communication to the wireless communication and transmit the image signal by the wireless communication.

  As described above, since the endoscope apparatus 1 according to the first embodiment stores how far the correction data and the initialization data have been transferred using the counter, the communication state is changed from wireless to wired. Or, even when switching from wired to wireless, it is not necessary to transfer correction data and initialization data from the beginning, and efficient data transfer is possible.

  In the endoscope apparatus 1 according to the first embodiment, wired communication is preferentially used. Usually, wired communication has a higher communication speed and higher communication stability than wireless communication. For this reason, communication speed and stability can be secured by giving priority to wired communication.

  Furthermore, even when wired communication is established first, wireless communication is established, so that even when wired communication is disconnected during data transfer, it is possible to immediately switch to wireless communication and continue data transfer.

(Second Embodiment)
In the second embodiment, an embodiment will be described in which correction data and initialization data are transferred in different file formats by wired communication and wireless communication. In addition, about the structure same as the structure of the endoscope apparatus 1 which concerns on 1st Embodiment demonstrated in FIG.1, FIG.2, FIG.5, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  FIG. 7 is a configuration diagram of the endoscope apparatus 2 according to the second embodiment. As shown in FIG. 7, the endoscope apparatus 2 according to the second embodiment 2 is provided with a head 20A and a CCU 30A. The endoscope apparatus 1 according to the first embodiment described with reference to FIG. The configuration is different.

  FIG. 8 is a configuration diagram of the head 20A provided in the endoscope apparatus 2 according to the second embodiment. As shown in FIG. 8, the head 20A of the endoscope apparatus 2 according to the second embodiment is provided with an encoding / decoding unit 28. The head 20 of the endoscope apparatus 1 according to the first embodiment is the same. And different.

  Based on an instruction from the transfer control unit 26, the encoding / decoding unit 28 of the head 20A reversibly compresses correction data and image signal data transferred from the memory 22 to the CCU 30A. Further, the encoding / decoding unit 28 decodes the initialization data transferred from the CCU 30 </ b> A to the memory 22 based on an instruction from the transfer control unit 26.

  Specifically, when correction data and image signal data are transferred to the CCU 30A using wireless communication, the transfer control unit 26 reversibly compresses (encodes) the correction data and image signal data to be transferred to the CCU 30A. Thus, the encoding / decoding unit 28 is instructed to transmit the correction data and the image signal data losslessly compressed by the encoding / decoding unit 28 to the head 20A. In addition, when the initialization data is transmitted from the CCU 30A using wireless communication, the transfer control unit 26 encodes / decodes the lossless-compressed initialization data so as to restore the data before compression. The instruction is sent to the conversion unit 28, and the decoded initialization data is stored in the memory 22.

  FIG. 9 is a configuration diagram of the CCU 30A included in the endoscope apparatus 2 according to the second embodiment. As shown in FIG. 9, the endoscope apparatus according to the first embodiment is that a system control circuit 36A provided in the CCU 30A of the endoscope apparatus 2 according to the second embodiment includes an encoding / decoding unit 36f. 1 different from CCU30A.

  The encoding / decoding unit 36f of the CCU 30A reversibly compresses initialization data transferred from the memory 36a to the head 20A based on an instruction from the MPU 36c. In addition, the encoding / decoding unit 36f decodes the reversibly compressed correction data and image signal data transferred from the head 20A based on an instruction from the MPU 36c.

  Specifically, when transmitting initialization data to the head 20A using wireless communication, the MPU 36c instructs the encoding / decoding unit 36f to perform lossless compression of the initialization data to be transmitted, and performs encoding / decoding. The initialization data reversibly compressed by the conversion unit 36f is transmitted to the head 20A. Further, when the correction data and the image signal data are transmitted to the CCU 30A using wireless communication, the encoding / decoding unit 36f is configured to decode the correction data and the image signal data and return the data to the data before compression. The decoded correction data and image signal data are stored in the memory 236a.

  As described above, the endoscope apparatus 2 according to the second embodiment transfers reversibly compressed data when transferring data (correction data, initialization data, image signal data) by wireless communication. Normally, wireless communication has a slower communication speed than wired communication. However, during wireless communication, the data to be transferred is reversibly compressed to reduce the data capacity, so that the time required for data transfer can be shortened.

(Third embodiment)
FIG. 10 is a configuration diagram of the endoscope apparatus 3 according to the third embodiment. Hereinafter, the endoscope apparatus 3 according to the third embodiment will be described. The same configuration as that of the endoscope apparatus 1 according to the first embodiment described with reference to FIGS. The same reference numerals are assigned and duplicate descriptions are omitted.

  The endoscope apparatus 3 according to the third embodiment includes a plurality of heads 20a and 20b and a CCU 30B used in common by the heads 20a and 20b. The CCU 30B includes a plurality of terminals 30a and 30b for charging a battery built in the heads 20a and 20b, and correction data and initial values are charged during charging of the batteries of the heads 20a and 20b connected to the terminals 30a and 30b. Complete the data transfer.

  In the third embodiment, the head in use (head 20a in FIG. 10) communicates with CCU 30B by wireless communication, and the other heads (head 20b in FIG. 10) are connected to CCU 30B. The battery is charged by being connected to one of the terminals 30a and 30b.

FIG. 11 is a configuration diagram of the head 20a. Since the heads 20a and 20b have the same configuration, only the head 20a will be described here.
As shown in FIG. 11, the head 20a of the endoscope apparatus 3 according to the third embodiment includes a terminal T3 in which a connection terminal of the wired communication unit 23 and a charging terminal of the battery 27 are integrated. However, it is different from the head 20 of the endoscope apparatus 1 according to the first embodiment described in FIG. By connecting this terminal T3 to one of the terminals 30a and 30b of the CCU 30B, wired communication with the CCU 30B and charging of the battery 27 are possible. Note that different IDs (identifiers) are stored in the memories 22 of the heads 20a and 20b, respectively.
Note that the connection terminal of the wired communication unit 23 and the charging terminal of the battery 27 do not necessarily have to be integrated, and may be configured as separate terminals as long as the head comes into contact with both terminals when contacting the CCU 30B. May be.

FIG. 12 is a configuration diagram of the CCU 30B.
As illustrated in FIG. 12, the CCU 30 </ b> B includes a plurality of terminals 30 a and 30 b and a connection detection circuit 39. Each terminal 30a, 30b is a terminal in which the connection terminal of the wired communication unit 31 and the charging terminal of the battery 27 built in the heads 20a, 20b are integrated. The terminals 30a and 30b are respectively connected to the wired communication unit 31 and the power supply circuit 37. When the terminal T3 of the heads 20a and 20b is connected, the wired communication with the heads 20a and 20b and the battery 27 of the heads 20a and 20b are connected. Charging becomes possible.

  The connection detection circuit 39 detects connection to the terminals 30a and 30b of the heads 20a and 20b. When the terminal T3 of the heads 20a and 20b is connected to the terminals 30a and 30b, the connection detection circuit 39 notifies the MPU 36c and the power supply circuit 37 of the terminal to which the heads 20a and 20b are connected.

  Next, an operation during charging of the heads 20a and 20b included in the endoscope apparatus 3 according to the third embodiment will be described. FIG. 13 is a flowchart showing the operation of the endoscope apparatus 3 according to the third embodiment. In the following description, the operation when the head 20a is in use and the head 20b is connected to the terminal 30b of the CCU 30B will be described.

(Step S201)
When the terminal T3 of the head 20b is connected to the terminal 30b included in the CCU 30B, the connection detection circuit 39 detects that either the head 20a or the head 20b is connected to the terminal 30b. The connection detection circuit 39 notifies the MPU 36c and the power supply circuit 37 that the head is connected to the terminal 30b.

(Step S202)
Based on the notification from the connection detection circuit 39, the power supply circuit 37 is supplied with power to the notified terminal 30b, and charging of the battery 27 of the head 20b is started.

(Step S203)
Based on the notification from the connection detection circuit 39, the MPU 36c instructs the wired communication unit 31 to establish wired communication with the head 20b. The wired communication unit 31 establishes wired communication with the wired communication unit 23 of the head 20b via the terminal 30b based on an instruction from the MPU 36c.

(Step S204)
When the wired communication is established, the MPU 36c instructs the transfer control unit 26 to transmit the ID from the memory 22 of the head 20b, and stores the transmitted ID in the memory 36a.

(Step S205)
After storing the ID, the MPU 36c instructs the transfer control unit 26 to transmit the correction data from the memory 22 of the head 20b, and associates the transmitted correction data with the previously read ID to the memory 36a. Remember.

(Step S206)
First, the MPU 36c instructs the transfer control unit 26 to transmit the number of correction data, and stores the transmitted number of correction data in the memory 36a. Next, the MPU 36c instructs the transfer control unit 26 to sequentially transmit the correction data stored in the memory 22, and stores the transmitted correction data in the memory 36a. At this time, the MPU 36c increments the value of the built-in counter every time correction data is stored in the memory 36a.

(Step S207)
The MPU 36c determines whether or not the correction data stored in the memory 36a in step S106 is the last correction data. Specifically, the MPU 36c determines whether or not the value of the built-in counter is the same as the number of correction data stored in the memory 36a.

  When the value of the built-in counter is not the same as the number of correction data stored in the memory 36a (No in step S207), the MPU 36c starts from step S205 until the value of the built-in counter becomes the same as the number of correction data stored in the memory 36a. The operation in step S207 is repeated.

(Step S208)
When the value of the built-in counter is the same as the number of correction data stored in the memory 36a (Yes in step S207), the MPU 36c receives initialization data (for example, resolution, clock, mode, etc.) from the memory 36a. Read out and transmit to head 20. The initialization data transmitted to the head 20 is stored in the memory 22 by the transfer control unit 26.

(Step S209)
The MPU 36c increments the value of the built-in counter each time initialization data is transferred.

(Step S210)
The MPU 36c determines whether or not the initialization data transferred in step S208 is the last initialization data. Specifically, the MPU 36c determines whether or not the value of the built-in counter is the same as the number of initialization data stored in the memory 36a.

  If the value of the built-in counter is not the same as the number of initialization data stored in the memory 36a (No in step S210), the MPU 36c steps until the value of the built-in counter becomes the same as the number of initialization data stored in the memory 36a. The operations from S208 to step S210 are repeated.

  When the value of the built-in counter is the same as the number of initialization data stored in the memory 36a (Yes in step S210), the MPU 36c ends the initialization data transfer.

  As described above, the endoscope apparatus 3 according to the third embodiment includes the plurality of heads 20a and 20b and the CCU 30B commonly used by the heads 20a and 20b, and is connected to the terminals 30a and 30b of the CCU 30. Since the correction data and the initialization data are transferred while the batteries of the heads 20a and 20b are charged, the correction data and the initialization data are transmitted at a slower communication speed than the wired communication when the heads 20a and 20b are used. Therefore, it is possible to obtain a clear image by correcting the image signal transferred immediately from the heads 20a and 20b, thereby improving user convenience.

(Other embodiments)
Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. For example, in the first embodiment, establishment of wired communication and wireless communication is started from the CCU 30 side. However, establishment of wired communication and wireless communication may be started from the head 20 side.

  DESCRIPTION OF SYMBOLS 1-3 ... Endoscope apparatus (imaging apparatus), 10 ... Scope, 10a ... Objective lens, 20 ... Head (head part), 21 ... Image sensor, 21a ... Prism, 22 ... Memory, 23 ... Wired communication part, 24 DESCRIPTION OF SYMBOLS ... Wireless communication part, 25 ... Built-in antenna, 26 ... Transfer control part, 27 ... Battery, 28 ... Encoding / decoding part, 30 ... CCU (main part), 31 ... Wired communication part, 32 ... Built-in antenna, 33 ... Wireless communication unit 34 ... Image signal processing circuit 34a ... Image signal processing unit 34b ... Synchronization signal generating unit 35 ... Image output circuit 35a ... Converter 35b ... Transmitter 36 ... System control circuit 36a ... Memory 36b ... Controller, 36d ... Receiving part, 36e ... Operation accepting part, 36f ... Decoding part, 37 ... Power supply circuit, 38 ... Communication establishment determination part, 40 ... Light source, 50 ... Camera cable Bull, 60 ... optical fiber.

Claims (12)

A head-separated imaging apparatus in which a head unit and a main body unit that processes an image signal transmitted from the head unit are separated,
The head portion is
A rechargeable battery ;
A first storage unit for storing correction data of the image signal;
Comprising
The main body is
A first terminal for connecting the head unit and receiving the image signal;
Provided at a position different from said first terminal, and a plurality of second terminals for charging a rechargeable battery of the head portion,
When it is detected that the head unit is connected to any of the plurality of second terminals , wired communication is established with the head unit, and the correction from the first storage unit is performed while the head unit is being charged. A control unit for acquiring data in advance;
An imaging apparatus comprising: An identifier is stored in the first storage unit of the head unit,
The controller is
The imaging apparatus according to claim 1 , wherein the correction data is acquired after acquiring the identifier from the first storage unit . The main body is
The imaging apparatus according to claim 1, further comprising a counter that counts the number of data transmitted by the wired communication, and continuously transmitting and receiving the data based on the count number of the counter. The main body is
A second storage unit for storing initialization data of the head unit;
The controller is
The imaging apparatus according to claim 1, wherein when the correction data is acquired from the first storage unit, the initialization data in the second storage unit is transferred to the head unit. An operation method of a head-separated imaging apparatus in which a head part and a main body part for processing an image signal transmitted from the head part are separated,
Connected to the head unit and provided at a position different from the first terminal for receiving the image signal, a plurality of second batteries for charging a rechargeable battery included in the head unit provided in the main body unit . When it is detected that the head unit is connected to one of the two terminals , wired communication is established with the head unit, and the image signal stored in the head unit is corrected while the head unit is being charged. An operation method of an imaging apparatus that acquires data in advance . The operation method of the imaging apparatus according to claim 5 , wherein the correction data is acquired after acquiring the identifier stored in the head unit . The main body is
The operation method of the imaging apparatus according to claim 5 , further comprising a counter that counts the number of data transmitted by the wired communication, and continuously transmitting and receiving the data based on the count number of the counter. The operation method of the imaging apparatus according to claim 5, wherein when the correction data is acquired, initialization data of the head unit stored in the main body unit is transferred to the head unit. A head-separated endoscope apparatus that includes a scope that is inserted into a subject and has a head unit that images the inside of the subject and a main body unit that processes an image signal transmitted from the head unit. And
The head portion is
A rechargeable battery ;
A first storage unit for storing correction data of the image signal;
Comprising
The main body is
A first terminal for connecting the head unit and receiving the image signal;
Provided at a position different from said first terminal, and a plurality of second terminals for charging a rechargeable battery of the head portion,
When detecting that the head portion to one of said plurality of second terminals are connected to establish the head portion and the wire communication, during charging of said head portion, said from said first storage portion A control unit for obtaining correction data in advance;
An endoscope apparatus comprising: An identifier is stored in the first storage unit of the head unit,
The controller is
The endoscope apparatus according to claim 9 , wherein the correction data is acquired after the identifier is acquired from the first storage unit . The main body is
The endoscope apparatus according to claim 9 , further comprising a counter that counts the number of data transmitted by the wired communication, and continuously transmitting and receiving the data based on the count number of the counter. The main body is
A second storage unit for storing initialization data of the head unit;
The controller is
The endoscope apparatus according to claim 9, wherein when the correction data is acquired from the first storage unit, the initialization data in the second storage unit is transferred to the head unit.

Images