CN112911172A - Target scene distance extraction device and method based on InGaAs camera - Google Patents

Target scene distance extraction device and method based on InGaAs camera Download PDF

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CN112911172A
CN112911172A CN202110099083.4A CN202110099083A CN112911172A CN 112911172 A CN112911172 A CN 112911172A CN 202110099083 A CN202110099083 A CN 202110099083A CN 112911172 A CN112911172 A CN 112911172A
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ingaas camera
laser
processing module
time
target scene
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CN112911172B (en
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黎伟
万强
米朝伟
韦尚方
曹海源
初华
刘云
田方涛
王赛
黄国俊
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Army Engineering University of PLA
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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
    • H04N25/50—Control of the SSIS exposure
    • H04N25/57—Control of the dynamic range
    • H04N25/58—Control of the dynamic range involving two or more exposures
    • H04N25/581—Control of the dynamic range involving two or more exposures acquired simultaneously
    • H04N25/583—Control of the dynamic range involving two or more exposures acquired simultaneously with different integration times
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules

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Abstract

The invention discloses a target scene distance extraction device based on an InGaAs camera, which comprises a laser, a time sequence control and image acquisition processing module, an emission lens, a receiving lens and the InGaAs camera. The invention adopts a high-precision time delay and image difference method, can effectively extract a distance value while extracting a target scene, and the distance precision can be matched with an internal clock of a camera to achieve a pixel integral counting clock. The invention solves the problem that the laser gating imaging precision is limited by the minimum integration time of the device.

Description

Target scene distance extraction device and method based on InGaAs camera
Technical Field
The invention relates to the field of photoelectric detection, in particular to a target scene distance extraction device based on an InGaAs camera, and further relates to a target scene distance extraction method based on the InGaAs camera, and the method is suitable for high-precision extraction of target scene distances.
Background
The development of the photoelectric technology promotes the rapid development of photoelectric passive observation equipment, promotes the wide application of passive observation equipment mainly based on visible light imaging, short wave infrared imaging, middle and far infrared imaging and the like in the aspects of national defense, military, security protection and the like, however, the passive imaging is difficult to obtain the distance value of a target area, the laser active imaging technology represented by laser radar can rapidly obtain the target distance value to be rapidly developed, but the imaging speed and the imaging detail resolution are not the same as those of a passive imaging combination, so that the laser gating imaging technology with the advantages of the two technologies is generated, the details of a target can be obtained, and the distance value of the target area can also be obtained.
The existing laser range gating method is limited by spectral response and integration time of an imaging device, generally adopts near-infrared laser as a lighting source, uses an ICCD device to carry out laser range gating research, and utilizes the short integration time characteristic of the ICCD to realize range gating.
Chinese patent CN 106506996B teaches a short-wave infrared imaging system based on linear array laser illumination and its working method, which uses linear array InGaAs detector and linear array light source to carry out laser gating imaging, but there is no explanation on the key problem of detector integral turn-on time, only mentions calculating integral delay of integral circuit according to the beam flight time of laser pulse, and only knowing the beam flight time under the condition of determining the target distance.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a target scene distance extraction device based on an InGaAs camera and a target scene distance extraction method based on the InGaAs camera. By adopting a high-precision time delay and image difference method, the distance value of the target scene can be effectively extracted while the target scene is extracted.
In order to achieve the purpose, the invention adopts the following technical measures:
the target scene distance extraction device based on the InGaAs camera comprises a laser, a time sequence control and image acquisition processing module, a transmitting lens, a receiving lens and the InGaAs camera,
the time sequence control and image acquisition processing module is used for acquiring digital image data output by the InGaAs camera, setting the total integration time of the InGaAs camera, triggering the InGaAs camera to start integration and controlling the laser to emit light;
the laser generates a laser beam required by illuminating a target scene under the triggering of the time sequence control and image acquisition processing module;
the InGaAs camera collects the optical signal output by the receiving lens under the setting and triggering of the time sequence control and image collection processing module and converts the optical signal into an electric signal, and forms digital image data output after the total integration time is finished,
an emission lens for projecting the laser beam output by the laser to a target area,
and the receiving lens is used for receiving the optical signal reflected by the target scene.
The target scene distance extraction method based on the InGaAs camera comprises the following steps:
the time sequence control and image acquisition processing module sets the total integration time of the InGaAs camera to be T for the ith timec-ΔT×(i-1)，TcThe initial total integration time is delta T delay step number, then the laser is started to emit light, and the delay T is delayed after the laser is started to emit light0+ Δ T (i-1) starts the InGaAs camera integration, T0As the initial value of time interval, the InGaAs camera outputs digital data after integrationImage data, time sequence control and image acquisition processing module for acquiring digital image data PiAnd finish storing, then use the digital image data Pi-1Subtracting digital image data PiObtaining a difference data image delta Pi-1Difference data image Δ Pi-1Corresponding target scene distance of
Figure BDA0002915368900000021
And c is the speed of light.
Compared with the prior art, the invention has the following beneficial effects:
1. the minimum target scene distance is irrelevant to the minimum integration time of the InGaAs camera and relevant to the clock period inside the InGaAs camera, and the highest precision of the InGaAs camera is achieved;
2. a scene three-dimensional image in a laser beam range is formed through multiple times of imaging, and the target details can reach a passive imaging level;
3. the method is suitable for any range gating imaging system, and is simple and high in practicability.
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FIG. 1 is a view showing the constitution of the apparatus of the present invention.
FIG. 2 is a timing diagram illustrating the method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples for the purpose of facilitating understanding and practice of the invention by those of ordinary skill in the art, and it is to be understood that the present invention has been described in the illustrative embodiments and is not to be construed as limited thereto.
As shown in fig. 1, the target scene distance extraction device based on InGaAs camera gating imaging includes a timing control and image acquisition processing module, a laser, a transmitting lens, a receiving lens and an InGaAs camera.
The time sequence control and image acquisition processing module is used for acquiring digital image data output by the InGaAs camera, setting working parameters and total integration time of the InGaAs camera, triggering the InGaAs camera to start integration, controlling the laser to emit light,
the laser generates a laser beam required by illuminating a target scene under the triggering of the time sequence control and image acquisition processing module,
the InGaAs camera collects the optical signal output by the receiving lens under the setting and triggering of the time sequence control and image collection processing module, converts the optical signal into an electric signal, forms digital image data output after the total integration time is finished,
an emission lens for projecting the laser beam output by the laser to a target area,
and the receiving lens is used for receiving the optical signal reflected by the target scene.
And the time sequence control and image acquisition processing module controls the laser to output laser beams and triggers the InGaAs camera to start up integrally according to the following time sequence.
Time interval initial value T between light emitting time of laser and integration starting time of InGaAs camera01us, the laser outputs light, the delay step number delta T is 100ns, and the initial total integration time T of the InGaAs camerac＝100us。
The time sequence control and image acquisition processing module sets the total integration time of the InGaAs camera to be T for the first timecThe laser is started to emit light, and the delay T is realized after the laser is started to emit light0Starting the integration of the InGaAs camera, outputting digital image data after the integration of the InGaAs camera is finished, and acquiring the digital image data P by the time sequence control and image acquisition processing module1And finishing the storage;
the time sequence control and image acquisition processing module sets the total integration time of the InGaAs camera to be T for the second timecDelta T, then starting the laser to emit light, and delaying T after the laser is started to emit light0+ delta T starts the InGaAs camera integration, digital image data is output after the InGaAs camera integration is finished, and the time sequence control and image acquisition processing module acquires the digital image data P2And the storage is completed,
then using the digital image data P1Subtracting digital image data P2Obtaining difference digital image data delta P1Difference digital image data Δ P1Corresponding target scene distance of
Figure BDA0002915368900000041
And c is the speed of light.
The target scene distance extraction method based on the gated imaging of the InGaAs camera comprises the following steps:
the time sequence control and image acquisition processing module sets the total integration time of the InGaAs camera to be T for the ith timec- Δ T × (i-1), then the laser is activated to emit light with a delay T0Starting the InGaAs camera integration after + delta T (i-1), outputting digital image data after the InGaAs camera integration is finished, and acquiring the digital image data P by the time sequence control and image acquisition processing moduleiAnd finish storing, then use the digital image data Pi-1Subtracting digital image data PiObtaining a difference data image delta Pi-1Is recorded as Δ Pi-1The difference data image Δ Pi-1Corresponding target scene distance of
Figure BDA0002915368900000042
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims (2)

1. The target scene distance extraction device based on the InGaAs camera comprises a laser, and is characterized by also comprising a time sequence control and image acquisition processing module, a transmitting lens, a receiving lens and the InGaAs camera,
the time sequence control and image acquisition processing module is used for acquiring digital image data output by the InGaAs camera, setting the total integration time of the InGaAs camera, triggering the InGaAs camera to start integration and controlling the laser to emit light;
the laser generates a laser beam required by illuminating a target scene under the triggering of the time sequence control and image acquisition processing module;
the InGaAs camera collects the optical signal output by the receiving lens under the setting and triggering of the time sequence control and image collection processing module and converts the optical signal into an electric signal, and forms digital image data output after the total integration time is finished,
an emission lens for projecting the laser beam output by the laser to a target area,
and the receiving lens is used for receiving the optical signal reflected by the target scene.
2. The method for extracting the distance between the target scenes based on the InGaAs camera, which utilizes the device for extracting the distance between the target scenes based on the InGaAs camera of claim 1, comprises the following steps:
the time sequence control and image acquisition processing module sets the total integration time of the InGaAs camera to be T for the ith timec-ΔT×(i-1)，TcThe initial total integration time is delta T delay step number, then the laser is started to emit light, and the delay T is delayed after the laser is started to emit light0+ Δ T (i-1) starts the InGaAs camera integration, T0The time interval is an initial value, digital image data is output after the InGaAs camera is integrated, and the time sequence control and image acquisition processing module acquires the digital image data PiAnd finish storing, then use the digital image data Pi-1Subtracting digital image data PiObtaining a difference data image delta Pi-1Difference data image Δ Pi-1Corresponding target scene distance of
Figure FDA0002915368890000011
And c is the speed of light.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4963024A (en) * 1988-07-07 1990-10-16 Kaman Aerospace Corporation Method and apparatus for determining K factor
CN104135625A (en) * 2014-07-23 2014-11-05 北京控制工程研究所 Adjusting method of exposure time of intersection measurement camera
CN107241533A (en) * 2016-03-29 2017-10-10 中国人民解放军92232部队 A kind of battle array scanning laser imaging device and method under water
CN107615486A (en) * 2015-03-26 2018-01-19 松下知识产权经营株式会社 Solid-state imager and the camera device for possessing the solid-state imager
CN110651200A (en) * 2017-03-28 2020-01-03 卢米诺技术公司 Active short wave infrared four-dimensional camera

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4963024A (en) * 1988-07-07 1990-10-16 Kaman Aerospace Corporation Method and apparatus for determining K factor
CN104135625A (en) * 2014-07-23 2014-11-05 北京控制工程研究所 Adjusting method of exposure time of intersection measurement camera
CN107615486A (en) * 2015-03-26 2018-01-19 松下知识产权经营株式会社 Solid-state imager and the camera device for possessing the solid-state imager
CN107241533A (en) * 2016-03-29 2017-10-10 中国人民解放军92232部队 A kind of battle array scanning laser imaging device and method under water
CN110651200A (en) * 2017-03-28 2020-01-03 卢米诺技术公司 Active short wave infrared four-dimensional camera

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