JPH07322070A - Fax machine - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a facsimile apparatus, and an object of the present invention is to enable reception on the receiving side according to the device configuration of the receiving side and to transmit image data of a multi-tone image in a suitable form. [Structure] The bit-plane expanding means 202 expands the input multi-valued image data into bit-planes and writes it in the plane memories 205 _{0 to} 205 _n . The compression encoding unit 207 compression encodes the bit plane data read from the plane memory. The transmission unit 209 transmits the compression-encoded image data. Communication means 206
Acquires the memory amount on the receiving side as the device information on the receiving side by communicating with the device on the receiving side. The transmission control unit 203 controls reading or transmission from the plane memory according to the device information on the receiving side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine, and more particularly to a facsimile machine for transmitting multi-gradation images.

[0002]

2. Description of the Related Art An example of a conventional facsimile machine is shown in FIG.
Shown in. This facsimile machine has a system controller 100.
4 which controls the entire facsimile. At the time of transmission, the image data is read by the scanner 1002, compression-encoded by the encoding / decoding unit 1006, temporarily stored in the image memory 1005, and transmitted via the communication control unit 1007, the modem 1008, and the network control device 1009. To the other station. At the time of reception, code data is received from the line via the network control device 1009, the modem 1008, and the communication control unit 1007, temporarily stored in the image memory 1005, and then the coding / decoding unit 10
The original image data is decoded by 06, and the plotter 100
It is recorded and discharged according to 3. Data is exchanged between the blocks in the facsimile apparatus via a data bus 1010. The operation / display unit 1001 includes operation keys and a display device necessary for operating the facsimile apparatus.

The above-mentioned facsimile machine handles binary image data. That is, the image data is binary black and white, but in recent years, it has become possible to record one pixel with a plurality of gradations due to the development of the recording system. Therefore, also in the transmission system, a method of compressing and encoding the multi-valued image data and transmitting it has been considered.

Adaptive discrete cosine transform (ADCT) is used for compression coding of multi-valued image data, and a method of entropy coding after converting the image, or a method of decomposing the image into bit planes and then normalizing each plane There is a method of compressing with a binary coding method. For example, JP-A-5-3
In the encoding method shown in Japanese Patent No. 00382, a configuration in which an arithmetic code is used as an encoding method in the latter case is shown.

In the above-mentioned conventional encoding method, image data is expanded into bit planes, compression-encoded and transmitted for each plane in order from the MSB or LSB side.

[0006]

According to the conventional encoding method, in a facsimile apparatus which receives a transmitted image signal, the image is reconstructed after receiving the image signals of all planes. A plain memory that can expand the data of is required.

However, in practice, depending on the recording system on the receiving side, it is not always necessary to transmit on a plane-by-plane basis. For example, in a facsimile apparatus such as a thermal recording system in which thermal control is performed to obtain a required density. Since it is often performed in recording line units, transmission can also be performed in line units. In this case, what is required at the time of recording is a multi-valued image memory for one line, which also causes a reduction in device cost. At this time, the problem is, for example, that the entire surface of an image of A4 size, 200 dpi is 8
From a facsimile machine having a memory capable of storing in bits / pixel, as described above, only in line units is received,
When transmitting to a non-recordable facsimile device, or when transmitting to a facsimile device capable of recording only 4 bits / pixel, it is naturally impossible to transmit the data for each plane as it is.

The present invention has been made in view of the above points, and provides a facsimile apparatus that can be received by the receiving side according to the device configuration of the receiving side and that can transmit image data of a multi-tone image in a suitable form. The purpose is to

[0009]

The invention according to claim 1 is
An image data input means for reading an image and inputting multivalued image data, a bitplane expanding means for expanding the input multivalued image data into a bitplane, and a plane memory into which the bitplane expanded bitplane data is written, Compression encoding means for compressing encoding the bit plane data read from the plane memory,
Transmission means for transmitting compression-encoded image data, communication means for obtaining the memory amount on the receiving side as device information on the receiving side by communicating with the device on the receiving side, and the plane according to the device information on the receiving side. And a transmission control means for controlling reading from the memory or transmission.

According to the second aspect of the present invention, the communication means obtains the recording system on the receiving side as the device information on the receiving side.

According to the third aspect of the invention, the communication means obtains the number of gradations that can be recorded on the receiving side as the device information on the receiving side.

According to another aspect of the invention, the communication means obtains the number of dots that can be received at one time on the receiving side as the device information on the receiving side.

In the invention of claim 5, the communication means is
As the device information of the receiving side, the number of lines that the receiving side can receive at one time is obtained.

According to the sixth aspect of the present invention, the communication means obtains the number of planes that can be received at one time on the receiving side as the device information on the receiving side. According to a seventh aspect of the present invention, the communication means uses, as device information of the receiving side, a memory amount on the receiving side, a recording method, a recordable gradation number, a dot number that can be received at one time, and a line number that can be received at one time. , Get any combination of the number of planes that can be received at one time.

According to an eighth aspect of the present invention, the transmission control means sets the data transmission order for reading and transmitting from the plane memory in units of one dot, one line, and a plurality of lines.
It is either a block unit to be a block or a plane unit.

According to a ninth aspect of the invention, the transmission control means controls the number of planes to be transmitted according to the device information on the receiving side.

[0017]

According to the first aspect of the present invention, by performing transmission / control according to the memory amount on the receiving side, it is possible to perform transmission according to the device configuration on the receiving side, and to increase the compression rate for data transmission. The amount can be reduced.

According to the second aspect of the present invention, by controlling the transmission according to the recording system on the receiving side, it is possible to perform transmission according to the device configuration on the receiving side, and increase the compression rate to increase the data transmission amount. Can be reduced.

According to the third aspect of the invention, the transmission / control is performed according to the number of gradations that can be recorded on the receiving side, so that the transmission can be performed according to the number of gradations on the receiving side.

In the invention according to claim 4, the transmission control is performed according to the number of dots that can be received at one time on the receiving side, so that the transmission can be performed according to the number of dots that can be received at one time on the receiving side. .

According to the invention of claim 5, by performing transmission / control according to the number of lines that can be received at one time on the receiving side, it is possible to perform transmission according to the number of lines that can be received at one time on the receiving side. Become.

In the sixth aspect of the invention, the transmission control is performed according to the number of planes that can be received at one time on the receiving side, so that the transmission can be performed according to the number of planes that can be received at one time on the receiving side. .

According to the seventh aspect of the invention, the transmission control is performed according to the combination of the memory amount on the receiving side, the recording method, the number of gradations, the number of dots or lines or planes that can be received at one time, It is possible to perform transmission according to the detailed conditions of the device configuration on the receiving side, and it is possible to increase the compression rate and reduce the amount of data transmission.

According to an eighth aspect of the invention, the data transmission order is 1 dot unit, 1 line unit, block unit,
Since it is set to one plane unit, it is possible to reduce the amount of communication of device information.

In the ninth aspect of the invention, since the number of planes to be transmitted is controlled according to the device information on the receiving side,
It is possible to prevent unnecessary transmission by transmitting image data by the number of planes that can be received by the receiving side, and prevent communication failure.

[0026]

1 is a block diagram of an embodiment of the device of the present invention. In the figure, an image data input means 201 reads an image to be transmitted and inputs it as image data. This image data is multi-valued data represented by n bits per pixel. The bit plane expanding means 202 expands the multi-valued image data into bit planes of respective positions, and the expanded bit plane data is prepared in a plane memory for the number of planes (in other words, the number of bits per pixel of the image data). It is written in 205 _{0 to} 205 _n .

Here, as shown in FIG. 2, for example, in the case of multi-valued image data of 8 bits / pixel, it is possible to decompose the binary image into eight planes in which binary equal bits representing one pixel are collected. it can. Each of them is called a bit plane, and ordinary bit plane coding performs coding for a binary image on each surface. In this case, the binary number indicating the density of the image may be a normal natural binary number, but the compression rate may be improved by using the Gray code (alternating binary code).

The transmission control means 203 communicates with the receiving side facsimile machine of the other party who intends to transmit the image data.
06, the device information of the facsimile machine on the receiving side is acquired, and based on this device information, the plane memories 205 _{0 to} 205 _n are read out, encoded, and controlled for transmission.

The compression encoding means 207 is the transmission control means 20.
The bit plane data read from each of the plane memories 205 _{0 to} 205 _{n under} the control of No. 3 is compression-encoded under the control of the transmission control means 203. The compression-encoded image data is transmitted by the transmission means 208 to the receiving side facsimile apparatus under the control of the transmission control means.

Next, each method of transmission control performed by the transmission control means 203 will be described assuming that image data is 8 bits / pixel.

FIG. 3 is an explanatory diagram of a method of reading bit plane data in dot units. In the figure, first, the first of the 7th bit plane of MSB (memory plane 205 ₇ )
After reading the first dot of the line, the first dot of the first line of the sixth bit plane (memory plane 206 ₆ ) is read, and similarly, the first line of the 0th bit plane (memory plane 205 ₀ ) of the LSB is sequentially read. Read up to 1 dot. Next, the second dot of the first line of the seventh bit plane (memory plane 205 ₇ ) is read, and thereafter, the lower bit planes are sequentially read in the same manner, compression encoded in the order of reading, and transmitted.

FIG. 4 is an explanatory diagram of a method of reading bit plane data in units of one line. In the figure, first, the first line of the seventh bit plane (memory plane 205 ₇ ) is read in order from the first dot, and then the first line of the sixth bit plane (memory plane 205 ₆ ) is read in order from the first dot. . Similarly, the first line of the 0th bit plane (memory plane 205 ₀ ) is sequentially read out. After this, the seventh bit plane (memory plane 20
5 ₇ ), the second line is sequentially read from the first dot, and thereafter, the lower bit planes are similarly read in order, compression-coded in the order of reading, and transmitted.

FIG. 5 is an explanatory diagram of a method of reading bit plane data in block units having a plurality of lines (for example, 3 lines) as blocks. In the figure, first, the first line to the third line of the seventh bit plane (memory plane 205 ₇ ) are sequentially read from the first dot, and then the first line to the third line of the sixth bit plane (memory plane 205 ₆ ). The line is sequentially read from the first dot. Similarly, the 0th bit plane (memory plane 205 ₀ )
From the first line to the third line. Thereafter, the fourth line to the sixth line of the seventh bit plane (memory plane 205 ₇ ) are sequentially read from the first dot, and thereafter, the lower bit planes are sequentially read in the same manner, compression-coded in the order of reading, and transmitted. .

FIG. 6 is an explanatory diagram of a method of reading bit plane data in plane units. In the figure, first, the seventh bit plane (memory plane 205 ₇ ) is read in order from the first dot of the first line to the last line, and then the sixth bit plane (memory plane 205 ₆ ) is read first.
Read from the first dot of the line to the last line in order. Similarly, the first dot to the last line of the first line of the 0th bit plane (memory plane 205 ₀ ) are sequentially read out, compression-encoded in the order of reading and transmitted.

Any of these reading methods can be adopted, but it can be said that it basically depends on the memory amount on the receiving side. That is, the dot-unit transmission requires the least amount of receiving memory, and conversely, the plane-unit transmission method requires the most amount of memory. This is because the receiving side repeats the process of restoring the image for each transmission unit and recording (or displaying) the restored image.

Further, in actuality, when recording is performed in the electrophotographic system, recording is performed in page units, and therefore the receiver side has at least a plane memory for one page. On the other hand, in the case of a receiver that performs thermal recording, the process of recording one line and sending the recording paper is repeated, so the processing unit is basically one line. It can be said that the above plane memory is not necessary, and the plane memory for one line is the minimum.

That is, regarding bit plane data, there is an optimum transmission order (dot unit, line unit, block unit, plane unit, etc.) depending on the device configuration on the receiving side.

7 and 8 are flow charts of the respective embodiments of the transmission processing executed by the facsimile apparatus of FIG.

The flow chart of FIG. 7 assumes memory transmission. In the figure, in step S10, the image is read by the image data input means 201. Next in step S20
Then, the bit plane expansion means 202 expands the bit plane.

After this, in step S30, the communication means 206
The device information of the receiving side facsimile device is received by.
Then, in step S40, based on this device information, as shown in FIG.
The plane memories 205 ₀ to 205 ₀ through the method shown in FIG.
The bit plane data is sequentially read from 205 _n ,
The data is compression-encoded by the compression-encoding means 207, and step S5
At 0, the image data is transmitted from the transmission means 209 to the receiving side facsimile apparatus. If it is determined in step S60 that the transmission has not ended, the process proceeds to step S40, steps S40 to S60 are repeated, and when the transmission ends, this process ends.

The flow chart of FIG. 8 assumes direct transmission. In the figure, in step S110, the communication means 206 receives the device information of the receiving side facsimile device. Then, in step S120, the image is read by the image data input unit 201 based on the device information. Next, in step S130, the bit plane expansion means 202 expands the bit plane. Further, in step S140, bit plane data is sequentially read from the plane memories 205 _{0 to} 205 _{n according} to the method shown in FIGS. 4 to 7 according to the device information, and the compression encoding means 207 performs compression encoding. Next, in step S150, the image data is transmitted from the transmission means 209 to the receiving side facsimile device.

Thereafter, if it is determined in step S160 that the transmission has not ended, the process proceeds to step S120, steps S120 to S160 are repeated, and when the transmission ends, this process ends.

By the way, in the G3 facsimile protocol, when there is a call from the transmitting side facsimile apparatus to the receiving side facsimile apparatus, the receiving side facsimile apparatus sends a reception start notification to the transmitting side, and then the type of its own modem,
A signal frame such as DIS (Digital Identification Signal) for informing the functions of the device such as input / output speed and recording paper width is returned to the transmitting side.

The device information described above is notified from the receiving side (which becomes NSF in the non-standard mode) to the transmitting side as this DIS signal. FIG. 9 shows the frame format of this DIS signal. In the figure, the head FLAG represents the head of the frame with an 8-bit fixed code "01111110". The next address field (AF) is an 8-bit fixed code “11111111”. The control field (CF) is an 8-bit code "110".
0X000 ", X = 0 indicates that the frame is not the final frame, and X = 1 indicates that the frame is the final frame. This is because the signal frame in FIG. It is provided in.

The next facsimile control field (FCF) is an 8-bit fixed code "00000100" indicating that it is a device information signal frame. In the facsimile control field (FIF), device information such as memory capacity, number of lines that can be received at one time, and plane number information is represented by a bit number that is a multiple of 8 bits. The next frame check field (FCF) is AF
16 bits of CRC (Cyclic Redundancy Check) code of data from to FIF are stored. 8-bit FLAG that indicates the end of the frame
“01111110” is provided.

In the first embodiment, the device information is transmitted to the memory amount on the receiving side, and the transmission is controlled so that the receiving side can receive it according to its size. At the time of transmission, the number of lines that can be transmitted at one time can be defined by this information, so the transmission side controls transmission accordingly.

As a modification of this, when transmitting the memory amount from the receiving side to the transmitting side, a plurality of memory amounts are arranged between the transmitting and receiving devices and transmitted by a code indicating which one of them. Is also good. As an example, if the actual memory amount is transmitted, 12 bits are required when the maximum value of the memory amount (in other words, the maximum value of the information that needs to be transmitted) is 4096 bytes.
32 bits are required for transmission in the SCII code. On the other hand, the amount of memory on the receiving side is 409
It is determined that there are four types of 6 bytes, 2048 bytes, 1024 bytes, and 512 bytes, and the amount of information required to indicate which of them is 2 bits. Even if there are about 100 types, only 7 bits are required. Also, in the device on the sending side that receives information at the same time, it is necessary to select from a limited amount of memory the register that is used when using that information rather than when the actual amount of memory is transmitted. Since the length and the memory are small, the device configuration such as the circuit configuration can be simplified as a result.

In the second embodiment, the information transmitted as the device information transmits the recording system on the receiving side. If the recording system on the receiving side is the electrophotographic system, there is at least one page of plane memory, while if it is the thermal recording system, there is at least one line of plane memory. That is, if the recording method on the receiving side is known, the optimum transmission method is naturally determined.

When a plane memory for one page exists on the receiving side, it is possible to transmit one line at a time, but generally, the previous line such as MR code, MMR code or arithmetic coding, or the peripheral pixels are transmitted. Since the compression rate tends to increase when the same plane is continuously compression-encoded by the encoding method performed with reference, the optimal transmission method is a method of continuously transmitting a certain bit plane.

When the receiving side has a plane memory for at least one line, it is possible to transmit one pixel at a time, but it is preferable to continuously perform compression coding for each line because the transmission amount is small. Is a transmission method of.

Further, it is considered that the facsimile device does not need to have all the functions from image input to recording discharge. That is, when transmitting or receiving a facsimile document from a personal computer, an operation is performed such that an image is not actually input or is not output as a hard copy. In the case of such a form of communication, it is stored in the storage device in the form of a file until it is finally printed. When considering the file format of image data in a personal computer, a multi-valued image is rarely recorded for each plane, and basically, a method of arranging density or luminance data dot by dot is often used. Considering this, when the receiving side is a personal computer, it is easier to form a file by transmitting in dot units, and transmission in dot units is optimal.

As a modification of this, the recording system on the receiving side is preliminarily agreed between the devices, and is transmitted by a code indicating which one of them. For example, when there are four types of recording (including display) methods of electrophotography, heat-sensitive, thermal transfer, and CRT, the amount of information for indicating which is 2 is 2
Is a bit. Therefore, it is possible to specify the recording method with a significantly smaller number of bits as compared with the case where these pieces of information are directly transmitted by the ASCII code or the like, and the device configuration is simplified.

In this case, for example, line transfer is performed for heat-sensitive and thermal transfer, and plane unit is performed for CRT and electrophotography. This is because a plane memory is inevitably necessary in a facsimile machine that displays multi-valued images on a CRT. However, since the size depends on the screen size, one page is not necessarily required.

By the way, the facsimile apparatus is not always configured to eject the hard copy, and when the facsimile is stored in the memory and then displayed on the CRT, the user (operator) determines that it is necessary. There is a configuration that only records are discharged. Also, instead of the CRT, there is one having a display device such as a liquid crystal display or a plasma display.

In the third embodiment, the number of gradations that can be recorded on the receiving side is transmitted as device information. For example, if the gradation reproducibility of the recording means is 16 gradations, the number of planes that can be transmitted is 4 and the receiving side need not have more memory. Therefore, by transmitting the number of recordable gradations to the transmitting side, data can be transmitted by the number of planes according to the capability of the receiving side. However, in this case, the size of image data per plane that can be received at one time must be determined in advance by both the transmitting and receiving sides.

As a modified example, a plurality of gradation numbers that can be recorded by the receiving side as the transmitted device information are preliminarily agreed among the devices, and the number of gradations is transmitted by a code indicating which one of them. This makes it possible to specify the gradation with a small number of bits, which simplifies the device configuration.

In the fourth embodiment, the number of dots that the receiving side can receive at one time is transmitted as the device information. For example, in the case of thermal recording, there is one that performs 4-division recording for one line from the viewpoint of power supply capability. In this case, assuming that the number of dots per line is 1728 dots, printing of 432 dots is performed for one printing, so that transmission control such that image data is transmitted in units of 432 dots becomes possible.

As a modified example, a plurality of dots are prearranged among the devices in advance regarding the number of dots that can be received at one time by the receiving side as the device information to be transmitted, and the dots are transmitted by a code indicating which one of them. As a result, the number of dots can be specified with a small number of bits, and the device configuration becomes simple.

In the fifth embodiment, the number of lines that the receiving side can receive at one time is transmitted as device information. For example, in the case of thermal recording or the like, the number of lines that can be received at one time is 1 in a device having a bit plane for 1 line,
In the case of electronic photography, the number of lines for one page is the number of lines that can be received at one time.

Further, in a facsimile apparatus for thermal recording, which has a bit plane memory for only 128 lines, 128 lines are transmitted for each plane so that the compression rate of image data becomes higher. When the number of planes is transmitted, a multi-valued image of 128 lines is reproduced on the receiving side. Considering a device in which the receiving side performs a recording operation at that time, the optimum transmission method is block unit transmission. In the case of such a device, line unit transmission is possible, but depending on the compression method, line unit transmission may have a lower compression rate than block unit transmission. Of course, the operation at the time of recording is also 1
It is possible to perform recording faster than waiting for reception of image data line by line. The transmitting side can transmit the image data by the optimal transmitting method based on the number of lines that the receiving side can receive at one time.

As a modified example, regarding the number of lines that can be received at one time by the receiving side as the transmitted device information, a plurality of devices are arranged in advance between the devices, and the number of lines is transmitted by a code indicating which one of them. As a result, the number of lines that can be received at one time can be specified with a small number of bits, and the device configuration becomes simple.

In the sixth embodiment, the number of planes that the receiving side can receive at one time is transmitted as the device information. For example, when the number of gradations that can be recorded on the receiving side is 16 gradations, it notifies that transmission of 4 planes is required. This allows the transmission side to perform transmission control based on the number of planes that the reception side can receive at one time.

As a modification of this, regarding the number of planes that can be received at one time by the receiving side as the transmitted device information,
A plurality of devices are arranged in advance and a code indicating which one is transmitted is transmitted. As a result, the number of planes that can be received at one time can be specified with a small number of bits, and the device configuration becomes simple.

In the seventh embodiment, as the device information, the memory amount on the receiving side, the recording method, the number of recordable gradations, the number of dots that can be received at one time, the number of lines that can be received at one time, and the plane that can be received at one time. The numbers or some of the codes indicating these are combined and transmitted. This enables detailed notification of the device information on the receiving side.

By the way, as described above, the transmission control means 203 is based on the device information on the receiving side, and is set to the transmission method by reading in bit units shown in FIG. 4, or the transmission method by reading in line units shown in FIG. Or FIG. 6
It is determined whether to use the transmission method by reading in block units in which the unit of a plurality of lines shown in FIG. 1 is one block or the transmission method by reading in plane units shown in FIG. 7, and the plane memory 205 according to the determined method. ₀
˜205 _n read control, compression encoding, and transmission control are performed.

It can be said that it is significant to use the dot unit, the line unit, the block unit, or the plane unit as the data transmission order in view of control at the time of recording. It is conceivable that the configuration and control of the system will become complicated with control units other than these. Also, when the transmitting side returns the information of the transmission method of the image data to the receiving side, the amount of information is limited (2 bits are sufficient), and it can be simplified in terms of device configuration or control. For example, when selecting to transmit in block units from the memory amount on the receiving side, it is necessary to make a prior arrangement such as setting 128 lines to one block. If the block unit is not selected, it is necessary to negotiate how many lines one block is composed of by using the method described in the fifth embodiment.

Further, the transmission control means 203 determines the number of planes to be transmitted based on the device information on the receiving side, that is, the number of recordable gradations on the receiving side, or the number of receivable planes, and performs transmission control. Therefore, it is possible to transmit the image data by the number of planes according to the condition of the receiving side, it is possible to prevent wasteful transmission of the image data, and it is possible to prevent the communication from being impossible due to the limitation of the receiving side device. .

FIG. 10 shows an embodiment of the communication procedure of the facsimile apparatus of the present invention. Here, the device data to be notified is the number of lines and the number of planes that can be received at one time. The facsimile machine on the receiving side in this example has 12 bits at 4 bits / pixel.
It has a receiving memory for eight lines, the main scanning size is known, and the processing unit is the above-mentioned block unit.

First, the reception side notifies the start of reception by calling from the transmission side, and then notifies the device information of the reception side, that is, the number of receivable lines (128 lines) and the number of planes (4 planes). From the device information, the transmission side notifies the reception side of the transmission method of transmitting 4 planes in a block-based transmission method in which 1 block is 128 lines. After this, compression-encoded image data of 128 lines of the 3rd bit plane of the MSB is transmitted, then 128 lines of the 2nd bit plane are transmitted, and 128 lines of the 0th bit plane are transmitted in the same manner. After that, the next 128 lines of the third bit plane are transmitted, and the same transmission is performed thereafter.

When all image data is transmitted by this,
The transmission side notifies the reception side of the end of transmission. Upon receiving this notification, the receiving side notifies the transmitting side of the reception result, and if the receiving result is normal, the transmitting side disconnects the call and ends the communication.

[0071]

As described above, according to the first aspect of the present invention, by performing transmission / control according to the memory amount on the receiving side, it is possible to perform transmission according to the device configuration on the receiving side and to compress the data. The rate can be increased to reduce the amount of data transmission.

According to the second aspect of the present invention, by performing the transmission control according to the recording system on the receiving side, it is possible to perform the transmission according to the device configuration on the receiving side, and the data transmission is performed by increasing the compression rate. The amount can be reduced.

According to the third aspect of the invention, the transmission / control is performed according to the number of gradations that can be recorded on the receiving side.
Transmission according to the number of gradations on the receiving side becomes possible.

According to the fourth aspect of the invention, the transmission control is performed according to the number of dots that can be received at one time on the receiving side, so that the transmission can be performed according to the number of dots that can be received at one time on the receiving side. Become.

According to the invention described in claim 5, by performing transmission / control according to the number of lines that can be received at one time on the receiving side, it is possible to perform transmission according to the number of lines that can be received at one time on the receiving side. Becomes

According to the sixth aspect of the invention, the transmission control is performed according to the number of planes that can be received at one time on the receiving side, so that the transmission can be performed according to the number of planes that can be received at one time on the receiving side. Become.

According to the invention described in claim 7, the transmission control is performed according to the combination of the memory amount on the receiving side, the recording method, the number of gradations, the number of dots or lines or the number of planes that can be received at one time. It is possible to perform transmission according to the detailed conditions of the device configuration on the receiving side, and it is possible to reduce the amount of data transmission by increasing the compression rate.

According to the invention described in claim 8, the data transmission order is 1 dot unit, 1 line unit, block unit, 1
Since the number of planes is set, the amount of communication of device information can be reduced.

According to the ninth aspect of the invention, since the number of planes to be transmitted is controlled according to the device information on the receiving side, image data is transmitted by the number of planes that can be received on the receiving side to prevent wasteful transmission. It is possible to prevent the communication from being disabled, which is extremely useful in practice.

[Brief description of drawings]

FIG. 1 is a block diagram of a device of the present invention.

FIG. 2 is a diagram showing a configuration of a bit plane.

FIG. 3 is a diagram for explaining a method of reading bit plane data.

FIG. 4 is a diagram for explaining a method of reading bit plane data.

FIG. 5 is a diagram illustrating a method of reading bit plane data.

FIG. 6 is a diagram for explaining a method of reading bit plane data.

FIG. 7 is a flowchart of a transmission process.

FIG. 8 is a flowchart of a transmission process.

FIG. 9 is a diagram showing a frame format of device information.

FIG. 10 is a diagram showing a transmission procedure of the device of the present invention.

FIG. 11 is a block diagram of a conventional device.

[Explanation of symbols]

201 image data input means 202 bit plane expansion means 203 transmission control means 205 _{0 to} 205 _n plane memory 206 communication means 207 compression encoding means 209 transmission means

Claims (9)

[Claims] 1. An image data input means for reading an image and inputting multi-valued image data, a bit plane expanding means for expanding the input multi-valued image data into a bit plane, and writing the bit plane expanded bit plane data. Received by communicating with the receiving side device, the plane memory that is compressed, the compression encoding means that compresses and encodes the bit plane data read from the plane memory, the transmission means that transmits the compression encoded image data, and the receiving side device. A facsimile apparatus comprising: a communication unit that obtains a memory amount on the receiving side as the device information on the receiving side; and a transmission control unit that controls reading or transmission from the plane memory according to the device information on the receiving side. 2. The facsimile apparatus according to claim 1, wherein the communication means obtains a recording system on the receiving side as device information on the receiving side. 3. The facsimile apparatus according to claim 1, wherein the communication unit obtains the number of gradations that can be recorded on the receiving side as the device information on the receiving side. 4. The facsimile apparatus according to claim 1, wherein the communication unit obtains, as the device information of the receiving side, the number of dots that can be received at the receiving side at one time. 5. The facsimile apparatus according to claim 1, wherein the communication unit obtains the number of lines that can be received at one time on the receiving side as device information on the receiving side. 6. The facsimile apparatus according to claim 1, wherein the communication unit obtains, as the device information of the receiving side, the number of planes that the receiving side can receive at one time. 7. The communication means, as device information of the receiving side, a memory amount on the receiving side, a recording system, a recordable gradation number, a dot number receivable at one time, a line number receivable at one time,
2. The facsimile apparatus according to claim 1, wherein any combination of plane numbers that can be received at one time is obtained. 8. The transmission control means sets the data transmission order of reading and transmitting from the plane memory in 1 dot units,
8. The facsimile apparatus according to claim 1, wherein one line unit or one plane unit including a plurality of lines as one block is used as one plane unit. 9. The facsimile apparatus according to claim 1, wherein the transmission control unit controls the number of planes to be transmitted according to the device information on the receiving side.