CN112782718B - Perspective glass imaging method and system based on laser gating - Google Patents
Perspective glass imaging method and system based on laser gating Download PDFInfo
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- CN112782718B CN112782718B CN202110002027.4A CN202110002027A CN112782718B CN 112782718 B CN112782718 B CN 112782718B CN 202110002027 A CN202110002027 A CN 202110002027A CN 112782718 B CN112782718 B CN 112782718B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 92
- 239000011521 glass Substances 0.000 title claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims description 10
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 230000005693 optoelectronics Effects 0.000 claims description 2
- 230000002411 adverse Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000087 laser glass Substances 0.000 description 1
- 238000002356 laser light scattering Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
- H04N25/71—Charge-coupled device [CCD] sensors; Charge-transfer registers specially adapted for CCD sensors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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Abstract
The application relates to a perspective glass imaging method and system based on laser gating. The perspective glass imaging method based on laser gating comprises the steps of obtaining a required detection distance through a distance measuring machine; generating a detection distance, wherein the detection distance is greater than the detection distance of the target window to be detected, and adjusting the pulse laser emitting parameter of a non-visible light pulse laser and the exposure delay time of a photoelectric imaging sensor according to the detection distance; controlling the invisible light pulse laser to irradiate the target window to be detected; and the photoelectric imaging sensor starts exposure after time delay and receives laser echo formed by the invisible light pulse laser and generates image information according to the laser echo. The perspective glass imaging method based on laser gating reduces adverse factors such as interference of laser backscattering and glass reflection.
Description
Technical Field
The application relates to the technical field of laser perspective imaging, in particular to a laser gating-based perspective glass imaging method and a laser gating-based perspective glass imaging system.
Background
The existing laser glass transmission equipment solves the problem of glass obstruction to a certain extent, but is easily influenced by laser backscattering and glass reflection. There is a need for an apparatus that reduces the effects of laser light scattering and glass reflection.
Disclosure of Invention
It is an object of the present application to provide a method of laser-gating based see-through glass imaging that overcomes or at least alleviates at least one of the above-mentioned deficiencies of the prior art.
The application firstly provides a perspective glass imaging method based on laser gating, which comprises the following steps:
acquiring the detection distance of a target window to be detected through a distance measuring machine;
generating a detection distance, wherein the detection distance is greater than the detection distance of the target window to be detected, and adjusting the pulse laser emission parameter of the invisible light pulse laser, the interval time between laser emission and photoelectric imaging sensor exposure and the photoelectric imaging sensor exposure time according to the detection distance;
controlling the invisible light pulse laser to irradiate the target window to be detected;
and the photoelectric imaging sensor starts to expose after delaying the interval time, receives the laser echo formed by the invisible light pulse laser and generates image information according to the laser echo.
Optionally, the method for imaging a perspective glass based on laser gating further comprises:
and the display control device acquires the image information and displays according to the image information.
Optionally, the optical pulse laser emission parameter comprises a laser divergence angle.
Optionally, the detection distance is adjusted according to the image information, the pulse laser emission parameter and the exposure delay time of the photoelectric imaging sensor are adjusted according to the adjusted detection distance, and the invisible light pulse laser is controlled again to irradiate the window of the target to be detected, so that the image information of the adjusted detection distance is obtained.
The present application further provides a laser-gating-based see-through glass imaging system, comprising: the system comprises a non-visible light pulse laser, a distance measuring machine and a photoelectric imaging sensor; wherein,
the range finder is used for obtaining the detection distance of a target window to be detected;
the invisible light pulse laser is used for irradiating a target window to be detected according to preset parameters;
the photoelectric imaging sensor is used for starting exposure after delaying the interval time, receiving laser echo formed by the invisible light pulse laser and generating image information according to the laser echo.
Optionally, the laser gating-based perspective glass imaging system further includes a display control device, and the display control device is configured to acquire the image information and display according to the image information.
Optionally, the laser gating-based perspective glass imaging system further includes a master controller, and the master controller is connected to the distance measuring machine, the invisible light pulse laser, and the photoelectric imaging sensor, respectively, and is configured to control the distance measuring machine, the invisible light pulse laser, and the photoelectric imaging sensor to operate and receive an instruction sent by the display control device.
Optionally, the photo-imaging sensor is an EMCCD (electron multiplying charge coupled device).
The perspective glass imaging method based on laser gating reduces adverse factors such as interference of laser backscattering and glass reflection, and has important application value. The method and the device have the advantages that objects between the window and an observer are not imaged by setting the time delay, and only the objects with the preset distance behind the glass are imaged, so that the interference without the selected distance is eliminated.
Drawings
FIG. 1 is a schematic flow chart of a method for imaging a speed-filtering-based laser-gated see-through glass according to an embodiment of the present application;
FIG. 2 is a system diagram of a laser gating-based see-through glass imaging system in an embodiment of the present application;
description of the drawings:
1. an imaging display control device; 2. a master controller; 3. a distance measuring machine; 4. a non-visible light pulse laser; 5. an EMCCD.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic main flow diagram of a method for imaging a see-through glass based on laser gating according to an embodiment of the present application.
The perspective glass imaging method based on laser gating shown in fig. 1 comprises the following steps:
step S1: acquiring the detection distance of a target window to be detected through a distance measuring machine;
step S2: generating a detection distance, wherein the detection distance is greater than the detection distance of the target window to be detected, and adjusting the pulse laser emitting parameter of the invisible light pulse laser, the interval time between laser emitting and photoelectric imaging sensor exposure and the photoelectric imaging sensor exposure time according to the detection distance;
and step S3: controlling the invisible light pulse laser to irradiate the target window to be detected;
and step S4: and the photoelectric imaging sensor starts to expose and receive laser echo formed by the invisible light pulse laser after delaying the interval time and generates image information according to the laser echo.
The application can effectively solve the problem that the glass blocks the sight, reduces adverse factors such as interference of laser backscattering and glass reflection, and has important application value. The method and the device have the advantages that objects between the window and an observer are not imaged by setting the time delay, and only the objects with the preset distance behind the glass are imaged, so that the interference without the selected distance is eliminated.
In this embodiment, in step S2, the detection distance is a distance from the laser-gating-based perspective glass imaging apparatus of the present application to any position behind the window of the target to be measured.
In this embodiment, the laser echo is a laser echo formed after the invisible light pulse laser irradiates the window of the target to be measured.
In this embodiment, the method for imaging a laser-gated see-through glass further comprises:
and the display control device acquires the image information and displays according to the image information.
In this embodiment, the pulse laser emission parameter includes a laser divergence angle.
In this embodiment, the detection distance is adjusted according to the image information, the pulse laser emission parameter and the interval time between laser emission and exposure of the photoelectric imaging sensor are adjusted according to the adjusted detection distance, and the invisible light pulse laser is controlled again to irradiate the window of the target to be detected, so as to obtain the image information of the adjusted detection distance.
The present application further provides a laser-gating-based see-through glass imaging system, comprising: the system comprises a non-visible light pulse laser, a distance measuring machine and a photoelectric imaging sensor; wherein,
the distance measuring machine is used for acquiring a required detection distance;
the invisible light pulse laser is used for irradiating a target window to be detected according to preset parameters;
the photoelectric imaging sensor is used for starting exposure after time delay and receiving laser echo formed by the invisible light pulse laser and generating image information according to the laser echo.
In this embodiment, the laser gating-based imaging system for a glass-on-glass further includes a display control device, and the display control device is configured to acquire the image information and display the image information according to the image information.
In this embodiment, the laser gating-based imaging system for a see-through glass further includes a master controller, and the master controller is configured to control the connection with the distance measuring machine, the invisible light pulse laser, and the photoelectric imaging sensor, respectively, and is configured to control the distance measuring machine, the invisible light pulse laser, and the photoelectric imaging sensor to work and receive an instruction sent by the display control device.
In this embodiment, the optoelectronic imaging sensor is an EMCCD.
A laser gating-based see-through glass imaging system comprising: the device comprises an imaging display control device 1, a master controller 2, a distance measuring machine 3, a non-visible light pulse laser 4, an EMCCD5 and the like. Specifically, the perspective glass imaging method based on laser gating can comprise the following steps:
first step ranging of target
Specifically, the user powers on the device for operation. The user aims at the target window with equipment, controls the distance measuring machine 3 to measure the distance of the window through the imaging display control device 1, returns the distance value to the master controller 2 through the distance measuring machine 3, and sends the distance value to the imaging display control device 1 to display after the master controller 2 analyzes the distance value.
Second step setting parameters
Specifically, the user can set the delay between the emission of the pulse laser and the start of the exposure of the EMCCD5 to 666.7ns (corresponding to a distance of 200 meters in two passes) and the exposure time of the EMCCD5 to 20ns (corresponding to a depth of field of 3 m) by the acquired distance, such as a distance of 100 meters.
For example, if the detection distance is 100 meters, the distance is equal to the speed of light multiplied by time (here, since the distance is the distance of the laser movement, the actual movement distance of the laser from the exit to the light reflected into the EMCCD at the detection distance of 100 meters is 200 m), i.e., 200/c = t, i.e., t =666.7ns.
In the present application, it is also necessary to set the depth of field distance, and when the depth of field in the present application is set to 3m, the depth of field × 2= c × exposure time, that is, the exposure time of the EMCCD5 is 20ns.
Thirdly, irradiation and imaging display
Specifically, the user controls the invisible light pulse laser 4 to irradiate the target window through the imaging display control device 1. Laser irradiates a target to form a laser echo, the EMCCD5 starts exposure after delaying and receives the target echo within a certain distance range, the EMCCD5 generates an image and then transmits the image to the imaging display control device 1, and the imaging display control device 1 displays the acquired image.
Fourth step of adjusting parameters
And resetting parameters such as time delay, exposure time and the like according to the acquired image by a user, adjusting the laser divergence angle of the invisible light pulse laser 4, and repeating the third step. For example, whether or not another distance is required is considered from the image, and if another distance is required, the image at the other distance is acquired by adjusting the laser emission angle and the interval time between the laser emission and the exposure of the photoelectric imaging sensor.
In a second aspect, the perspective glass imaging device based on laser gating is used for realizing the perspective glass imaging method based on laser gating; specifically, the laser gating-based perspective glass imaging device can comprise an imaging display control device 1, a general controller 2, a distance measuring machine 3, a non-visible light pulse laser 4, an EMCCD5 and the like.
Specifically, as shown in fig. 1, the distance measuring machine 3 is parallel to the optical axes of the non-visible light pulse laser 4 and the EMCCD5, and can irradiate the same target irradiated with the non-visible light pulse laser 4 and imaged by the EMCCD 5. The laser wave band used by the invisible light pulse laser 4 is a near-infrared wave band, so that human eyes cannot find laser spots, and the divergence angle of the laser is adjustable. The EMCCD5 includes an imaging objective lens and an EMCCD sensor.
The present application is described in further detail below by way of examples, it being understood that this example is not intended to be limiting in any way.
Referring to fig. 2, assuming a window is located 100 meters away from the laser-gated based see-through glass imaging apparatus of the present application, and someone is present behind the window, it is desirable to use the method of the present application for imaging.
The method comprises the steps of firstly obtaining the detection distance of a window of a target to be detected through a distance measuring machine, and detecting to obtain the distance between the distance measuring machine and the window of the application, wherein the distance is 100 meters.
The detection distance is generated, for example, if the user considers that a presentation near 110 meters needs to be acquired, and the depth of field is 3m, the detection distance is set to 110 meters, and the depth of field is 3m. Adjusting the pulse laser emitting divergence angle of the invisible light pulse laser, the interval time between laser emitting and photoelectric imaging sensor exposure and the exposure time according to the detection distance and the depth of field of 110 meters;
controlling a non-visible light pulse laser to irradiate a target window to be detected;
and the photoelectric imaging sensor starts exposure after delaying the interval time, receives laser echo formed by the invisible light pulse laser and generates image information according to the laser echo, so that the image information at the position of 110 meters can be acquired.
If the user determines that detection is needed after acquiring the image information at 110 meters, for example, the user needs to acquire the image information at 120 meters, the user resets the detection distance, which is set to 120 meters, adjusts the pulse laser emission parameter and the exposure delay time of the photoelectric imaging sensor according to the detection distance, and repeats the steps after adjustment.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (6)
1. A perspective glass imaging method based on laser gating is characterized by comprising the following steps:
acquiring a detection distance of a target window to be detected through a distance measuring machine;
generating a detection distance, wherein the detection distance is greater than the detection distance of the target window to be detected, and adjusting the pulse laser emission parameter of the invisible light pulse laser, the interval time between laser emission and photoelectric imaging sensor exposure and the photoelectric imaging sensor exposure time according to the detection distance;
controlling the invisible light pulse laser to irradiate the target window to be detected;
the photoelectric imaging sensor begins to expose after delaying the interval time and receives the laser echo formed by the invisible light pulse laser and generates image information according to the laser echo;
the pulse laser emission parameters comprise laser divergence angles;
after the photoelectric imaging sensor starts exposure after delaying the interval time and receives the laser echo formed by the invisible light pulse laser and generates image information according to the laser echo, the method further comprises the following steps:
adjusting the detection distance according to the image information, adjusting the pulse laser emission parameters and the interval time between laser emission and photoelectric imaging sensor exposure according to the adjusted detection distance, and controlling the invisible light pulse laser to irradiate a window of a target to be detected again so as to obtain the image information of the adjusted detection distance;
the interval time between the laser emission and the exposure of the photoelectric imaging sensor is calculated by the following formula:
wherein t is the interval time between the laser emission and the exposure of the photoelectric imaging sensor, l is the detection distance, and c is the light speed;
the exposure time of the photoelectric imaging sensor is calculated by the following formula:
t′*c＝2*L
in the formula, t' is the exposure time of the photoelectric imaging sensor, L is the depth of field, and c is the speed of light.
2. The laser-gating-based fluoroscope imaging method of claim 1, wherein said laser-gating-based fluoroscope imaging method further comprises:
and the display control device acquires the image information and displays according to the image information.
3. A laser-gating-based fluoroscope imaging system, comprising: the system comprises a non-visible light pulse laser, a distance measuring machine and a photoelectric imaging sensor; wherein,
the range finder is used for obtaining the detection distance of a target window to be detected;
the invisible light pulse laser is used for irradiating a target window to be detected according to preset parameters;
the photoelectric imaging sensor is used for starting exposure according to exposure time after delaying interval time, receiving laser echo formed by the invisible light pulse laser and generating image information according to the laser echo;
the preset parameters of the invisible light pulse laser comprise a laser divergence angle;
the photoelectric imaging sensor is further used for adjusting the detection distance according to the image information, adjusting the laser divergence angle and the interval time between laser emission and photoelectric imaging sensor exposure according to the adjusted detection distance, and controlling the invisible light pulse laser to irradiate the window of the target to be detected again so as to obtain the image information of the adjusted detection distance;
the interval time is calculated by the following formula:
wherein t is the interval time between the laser emission and the exposure of the photoelectric imaging sensor, l is the detection distance, and c is the light speed;
the exposure time is calculated by the following formula:
t′*c＝2*L
wherein t' is the exposure time of the photoelectric imaging sensor, L is the depth of field, and c is the speed of light.
4. The laser-gating based fluoroscope imaging system of claim 3, wherein said laser-gating based fluoroscope imaging system further comprises a display control means for acquiring said image information and displaying based on said image information.
5. The laser-gating based perspective glass imaging system of claim 4, wherein the laser-gating based perspective glass imaging system further comprises an overall controller, and the overall controller is respectively connected with the distance measuring machine, the invisible light pulse laser and the photoelectric imaging sensor, and is used for controlling the distance measuring machine, the invisible light pulse laser and the photoelectric imaging sensor to work and receiving instructions sent by the display control device.
6. The laser-gating based fluoroscope imaging system of claim 5, wherein said optoelectronic imaging sensor is an EMCCD.
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| US8731240B1 (en) * | 2010-08-05 | 2014-05-20 | Lockheed Martin Corporation | System and method for optics detection |
| CN109975828A (en) * | 2019-04-25 | 2019-07-05 | 长春理工大学 | From triggering strobed laser imaging method |
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| US9182491B2 (en) * | 2011-05-06 | 2015-11-10 | Waikatolink Limited | Selective distance range imaging |
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| US9482617B2 (en) * | 2012-06-07 | 2016-11-01 | Jeffrey M. Smith | Method for optical detection of surveillance and sniper personnel |
| CN102749625A (en) * | 2012-06-28 | 2012-10-24 | 北京航空航天大学 | Range-gating laser-imaging detection method for cat-eye effect target |
| CN106094195A (en) * | 2016-06-21 | 2016-11-09 | 河南平原光电有限公司 | A kind of possess window see take aim at, the hand-held passive binoculars of camera function |
| CN108120990B (en) * | 2017-12-29 | 2021-03-23 | 山东神戎电子股份有限公司 | Method for improving range finding precision of range gating night vision device |
| CN110609298B (en) * | 2019-09-26 | 2020-06-30 | 湖南国天电子科技有限公司 | Distance gate control method and device suitable for detecting complex scene |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8731240B1 (en) * | 2010-08-05 | 2014-05-20 | Lockheed Martin Corporation | System and method for optics detection |
| CN109975828A (en) * | 2019-04-25 | 2019-07-05 | 长春理工大学 | From triggering strobed laser imaging method |
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