CN115103197B - Intensity coding type wide-spectrum dual-channel compression imaging method and system - Google Patents
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Abstract
The invention discloses an intensity coding type wide-spectrum dual-channel compression imaging method and system, and belongs to the technical field of computational imaging. According to the invention, through intensity coding type wide-spectrum dual-channel compression imaging, single exposure is realized, dual-channel images are captured at the same time, the time resolution of a dual-channel compression imaging system is doubled, and the data size is doubled under the same imaging time resolution precision requirement. The invention separates the mixed images acquired by the two-channel shared image plane in a coding compression mode, and enlarges the imaging field of view without adding a scanning device. The invention adopts total reflection imaging to realize the imaging of the double-channel wide spectrum. The invention realizes the concurrent imaging of a large view field and a long focal length through the intensity coding type wide-spectrum dual-channel compression imaging, can be applied to ultraviolet, visible and infrared full-band imaging, and has the advantages of high resolution, narrow bandwidth, simple adjustment, low computational complexity, wide imaging spectrum, compact structure, high stability and good economy of an imaging system.
Description
Technical Field
The invention belongs to the technical field of computational imaging, and relates to an intensity coding type wide-spectrum dual-channel compression imaging method and system.
Background
At present, the scientific technology is continuously developed, the times of high-speed development bring new requirements to the optical system, but the design of the traditional optical system faces serious bottlenecks, the needs of the times cannot be completely solved, and the computational imaging is generated. The computational imaging fully utilizes the advantages of high communication bandwidth and high floating point computational efficiency at present, relieves the pressure of an optical system, and has great application value in reducing the cost of the optical system and improving the performance and index of the optical system. Currently, the optical system has great application in the monitoring field and has wide prospect in various fields such as industrial production, smart cities, intelligent manufacturing, automation, sports games, urban public security and the like. These fields of application also continually place new demands and indices on the design of optical systems.
At present, an optical lens for monitoring is continuously pursued with a larger and larger field of view and a longer and longer focal length, wherein the larger and larger field of view means that a larger range can be monitored to acquire more abundant object information, and the longer and longer focal length improves the working distance and the spatial resolution of an optical system. But is limited by the theory of traditional optical design, the field of view and focal length are always a pair of contradictory quantities, and cannot be effectively improved at the same time. The traditional methods for solving the problems include detector splicing, compound eye, scanning and the like. However, the geometric multiple of the information amount is inevitably increased due to the splicing of the detectors, and in addition, the fields of view are lost due to the spliced parts of the detectors, so that the monitoring is not facilitated; the compound eye is difficult to design, and the tooling adjustment has great difficulty, so that the information quantity is greatly increased, and the cost is increased; the optical scanning can be carried out by adding an optical scanning mechanism, a steering engine and the like into an optical system, the reliability of the system can be greatly reduced by a complex motor system and a rotating mechanism, the volume and the weight of the system are obviously improved, and the time resolution is reduced. Therefore, there is a need for an optical solution that can properly solve the contradiction between the field of view and the focal length without introducing other contradictions.
In 2016, cheng Dewen et al of Beijing university, design of all-REFLECTIVE DUAL-channel foveated IMAGING SYSTEMS based on freeform optics, proposed a reflective dual-channel concave imaging optical system, which uses one channel for large-field imaging and the other channel for long focal length, so that both large-field imaging and long focal length are achieved, but the dual detectors are adopted, so that the system bandwidth is greatly increased, and global high resolution cannot be realized. In 2021, zhu Jun et al, university of Qinghai, in Simultaneous improvement of field-of-view and resolution IN AN IMAGING optical system, proposed a design method that simultaneously increased the field of view and focal length of the optical system, but that expanded the field of view by reducing the focal length of the fringe field of view, the resolution of the reduced fringe field of view more similar to that of the field of view by design distortion, and the resulting image was therefore not visually observable to the human eye. In addition, in the field of recompression imaging, patents similar to the patent are CN201210172731.5 and CN201210193244.7, but the method is mainly applied to the field of spectrum and is realized through two area array detectors, so that the system volume, weight, calculation burden and system bandwidth are increased.
Disclosure of Invention
In order to solve the contradiction problem of optical imaging view field and focal length, the invention discloses an intensity coding type wide-spectrum dual-channel compression imaging method and system. The technical problems to be solved are as follows: through intensity coding type wide-spectrum dual-channel compression imaging, single exposure is realized, simultaneously images without chromatic aberration and wide-spectrum images are captured, the contradiction between an optical imaging view field and a focal length is solved, large-view-field and long-focal-length concurrent imaging is realized, and the imaging system has the advantages of high resolution, narrow bandwidth, wide imaging spectrum, compact structure, high stability and good economy.
The aim of the invention is achieved by the following technical scheme.
According to the intensity coding type wide-spectrum dual-channel compression imaging method disclosed by the invention, single exposure is realized and dual-channel images are captured simultaneously through intensity coding type wide-spectrum dual-channel compression imaging, and under the condition of the same detector, compared with a traditional alternately-operated dual-channel imaging system, the time resolution of the dual-channel compression imaging system is doubled, and the data size is doubled under the same imaging time resolution precision requirement. The mixed images acquired by the two-channel shared image surface are separated in a coding compression mode, and the imaging view field is enlarged without adding a scanning device, so that the structural compactness, stability and economical efficiency of an imaging system are improved. The intermediate image plane intensity coding mode is adopted for compression coding, a clear image plane can be obtained at the image plane, the image is convenient to mount and tune, the image restoration is carried out in a space domain, multiple Fourier transformation and convolution operation are not needed, and the computational complexity is low. And realizing double-channel wide-spectrum imaging by adopting total reflection imaging. In summary, the invention solves the contradiction between the optical imaging field of view and the focal length by the intensity encoding type wide-spectrum dual-channel compression imaging, realizes concurrent imaging of a large field of view and a long focal length, can be used in ultraviolet, visible and infrared full-band imaging applications, and has the advantages of high resolution, narrow bandwidth, simple adjustment, low computational complexity, wide imaging spectrum, compact structure, high stability and good economy of an imaging system.
The invention discloses an intensity coding type wide-spectrum dual-channel compression imaging method, which expands intensity coding type wide-spectrum dual-channel compression imaging into intensity coding type wide-spectrum multi-channel compression imaging, further expands imaging view field, improves the structural compactness, economy and resolution of an imaging system and compresses the bandwidth of the imaging system.
The method for the two-channel compression imaging of the intensity coding type wide spectrum adopts the two-channel compression mode of the intensity coding type wide spectrum to separate and image, and comprises the following realization steps:
Step one: the method comprises the steps of encoding imaging light beams acquired by an intensity encoding type wide-spectrum dual-channel compression imaging light path on an intermediate image plane, wherein encoding modulation is realized through an encoding plate placed on the intermediate image plane, and two intermediate image planes in the intensity encoding type wide-spectrum dual-channel compression imaging light path are required to be coplanar and cannot be completely overlapped, so that encoded imaging light beams are obtained.
Step two: and (3) exposing the coded imaging light beam obtained in the step one through a double-channel shared image plane to obtain a double-channel shared image plane mixed image.
The dual-channel shared image plane refers to that the dual channels share one area array photoelectric detector to capture a mixed image.
The intensity information i (x, y) of the mixed image captured by the area array photodetector is simplified into
i(x,y)＝f1(x,y)·coding1(x,y)+f2(x,y)·coding2(x,y) (1)
Where, represents a point multiplication, f 1(x,y)、f2 (x, y) represents object space information captured by two channels of the intensity-coded wide-band dual-channel compression imaging optical system, coding 1(x,y)、coding2 (x, y) represents a region binary model of an encoded plate passed by two channels of the intensity-coded wide-band dual-channel compression imaging optical system.
Step three: denoising the two-channel shared image surface mixed image obtained in the step two, carrying out image restoration on the shared image surface mixed image through a compressed sensing restoration algorithm, and respectively restoring object side images of two imaging channels from one image, namely realizing coding compression separation imaging.
The inverse problem of intensity-coded wide-band dual-channel compression imaging is converted into a compressed sensing restoration problem:
And (3) taking the compressed sensing restoration problem shown in the formula (2) as an objective function of image restoration, carrying out image restoration on the mixed image of the common image plane through a compressed sensing restoration algorithm, and respectively restoring object side images of two imaging channels from one image, namely realizing coding compression separation imaging.
By adopting the intensity coding type wide-spectrum dual-channel compression mode for separation imaging, two separation images can be obtained, and preferably, the two separation images are spliced according to the dual-channel visual field relation, so that the visual effect of imaging is improved on the basis of expanding the visual field.
The invention also discloses an intensity coding type wide-spectrum dual-channel compression imaging system which is used for realizing the intensity coding type wide-spectrum dual-channel compression imaging method. The intensity coding type wide-spectrum dual-channel compression imaging system comprises a main mirror, a first secondary mirror, a second secondary mirror, a three-mirror, a coding plate, four mirrors, five mirrors, an area array photoelectric detector and an image restoration system. The individual components are arranged in sequence in the direction of propagation of the light.
The primary mirror is positioned at the forefront end of the optical system and is used for providing certain optical power and aberration correcting capability for the two optical channels.
The first secondary mirror is positioned behind the main mirror in the light path and is an aperture diaphragm of the first secondary mirror and is used for dividing two channels and simultaneously providing certain focal power and aberration correcting capability for the first secondary mirror.
The second secondary mirror is positioned behind the main mirror in the light path and is an aperture diaphragm of the second secondary mirror and is used for dividing two channels and providing certain optical power and aberration correcting capability for the second secondary mirror.
The three mirrors are positioned behind the first secondary mirror and the second secondary mirror in the light path, are shared by the first secondary mirror and the second secondary mirror, and are used for providing certain optical power and the capability of correcting aberration for the two channels, converging light beams and imaging on an intermediate image plane.
The coding plate is positioned on the image surface of the front off-axis three-mirror system in the light path, and is equivalent to the situation that the image surface of the middle of the imaging system is increased or decreased as appropriate, the image surfaces of the middle of the first secondary mirror and the second secondary mirror are on the same plane, but cannot be overlapped, a certain offset is required, the coding plate is overlapped with the image surface, and a certain offset is provided at the position where the image surfaces of the first secondary mirror and the second secondary mirror are overlapped with the coding plate. The code board is a binary code board with random codes, and is used for providing respective coding modes for different channels.
The four mirrors are positioned behind the coding plate in the light path and form a reflective relay system together with the five mirrors for secondary imaging.
The five mirrors are positioned behind the four mirrors in the light path and form a reflective relay optical system together with the four mirrors, the reflective relay optical system needs to meet the relation of two sets of object images, and the image surfaces of the first secondary mirror and the second secondary mirror are overlapped together for secondary imaging. This requirement is easier to implement when the image plane position deviation of the first and second sub-mirrors is not large.
The area array photoelectric detector is positioned behind the imaging objective lens, is a commonly used photoelectric sensor such as CMOS or CCD, and the photosensitive surface of the area array photoelectric detector coincides with the image surface of the imaging objective lens, converts optical signals into electric signals and transmits the electric signals to the image restoration module.
The image restoration module is a single chip microcomputer, a notebook computer and other computing terminals comprising an image restoration algorithm, can restore digital images transmitted by photoelectric detectors such as CCD (charge coupled device) or CMOS (complementary metal oxide semiconductor) and the like through a compressed sensing restoration algorithm, respectively restores object side images of two imaging channels from one image, adopts an algorithm to be matched with the coding mode, and adopts a compressed sensing restoration algorithm, convex optimization, deep learning and the like.
The beneficial effects are that:
1. the two-channel image plane sharing is adopted, so that under the condition of limited detector area array, the focal length and the view field of an optical system can be improved, wide-area high-resolution monitoring of a target scene can be realized, more target details can be captured by high resolution, the target recognition probability can be greatly improved, the monitoring range can be greatly improved in wide area, the target tracking is facilitated, and particularly, the target recognition probability of a monitoring tracking system is remarkably improved for targets with high maneuvering performance.
2. According to the intensity coding type wide-spectrum dual-channel compression imaging method and system disclosed by the invention, the compressed sensing theory is adopted, and the object side images of the two channels are separated from the single Zhang Gongyong image plane mixed image through the compressed sensing restoration algorithm, so that the simultaneous promotion of the view field and the focal length is realized, and the time resolution of the system is not reduced. In addition, as the two-channel image surfaces are shared, the detector can obtain double light energy in the traditional imaging, the loss of the illumination of the image surface caused by intensity coding in the traditional compression coding imaging is compensated, and the high signal-to-noise ratio image with lower exposure time can be realized, so that the method has great benefit for tracking the target with high maneuvering performance. The target tracking efficiency of the monitoring tracking system is remarkably improved.
3. According to the intensity coding type wide-spectrum dual-channel compression imaging method and system disclosed by the invention, through image plane sharing, dual-channel simultaneous working and combined with compressed sensing algorithm restoration, the respective object side images of the two channels at the same moment are separated from a shared image plane mixed image, so that the effect of reducing the data volume by half is realized. The method can effectively solve the defects of high bandwidth requirement of the existing high-definition lens and short storage time of the monitoring video, and provides a new solution for a video transmission scheme of large-view-field high-definition monitoring.
4. The intensity coding type wide-spectrum dual-channel compression imaging method and system disclosed by the invention have the advantages that intensity coding is carried out on the middle image surface, compared with frequency domain coding, a clear image surface can be obtained at the image surface, accurate guidance is conveniently provided for the adjustment of the system, and the adjustment is facilitated. In addition, because intensity coding is adopted, image restoration completely occurs in a spatial domain, fourier transformation and convolution operation with high complexity are not needed, the algorithm calculation complexity is low, and the calculation force requirement is low.
Drawings
FIG. 1 is a flow chart of an intensity encoding type wide spectrum dual-channel compression imaging method disclosed by the invention;
FIG. 2 is a flowchart of an image restoration algorithm for implementing the method of the present invention;
FIG. 3 is a schematic diagram of a system structure according to an embodiment of the present invention;
FIG. 4 is an image for algorithm simulation in an embodiment of the present invention, which represents object information collected by two channels, respectively;
FIG. 5 is a diagram of a binary code plate through which two channels pass in an embodiment of the present invention, the two images being different portions of the same code plate;
FIG. 6 is a blended image obtained by two channels operating simultaneously in which information collected by the two channels is blended together in an embodiment of the present invention;
fig. 7 illustrates object information captured by the two channels recovered from fig. 6 by the image recovery system in accordance with an embodiment of the present invention.
Wherein: 1-main mirror, 2-primary mirror, 3-secondary mirror, 4-three mirrors, 5-coding plate, 6-four mirrors, 7-five mirrors, 8-area array photoelectric detector and 9-image restoration system
Detailed Description
For a better description of the objects and advantages of the present invention, the following description will be given with reference to the accompanying drawings and examples.
Example 1:
As shown in fig. 1, the embodiment discloses an intensity encoding type wide spectrum dual-channel compression imaging method, which specifically comprises the following implementation steps:
The method for the two-channel compression imaging of the intensity coding type wide spectrum adopts the two-channel compression mode of the intensity coding type wide spectrum to separate and image, and comprises the following realization steps:
Step one: the method comprises the steps of encoding imaging light beams acquired by an intensity encoding type wide-spectrum dual-channel compression imaging light path on an intermediate image plane, wherein encoding modulation is realized through an encoding plate placed on the intermediate image plane, and two intermediate image planes in the intensity encoding type wide-spectrum dual-channel compression imaging light path are required to be coplanar and cannot be completely overlapped, so that encoded imaging light beams are obtained.
Step two: and (3) exposing the coded imaging light beam obtained in the step one through a double-channel shared image plane to obtain a double-channel shared image plane mixed image. The blended image is shown in fig. 6.
The dual-channel shared image plane refers to that the dual channels share one area array photoelectric detector to capture a mixed image.
The intensity information i (x, y) of the mixed image captured by the area array photodetector is simplified into
i(x,y)＝f1(x,y)·coding1(x,y)+f2(x,y)·coding2(x,y) (3)
Wherein, representing the point multiplication, f 1(x,y)、f2 (x, y) represents the object space information captured by two channels of the intensity-coded broad-band dual-channel compression imaging optical system, as shown in fig. 4; coding 1(x,y)、coding2 (x, y) represents a region binary model of the code plate passed by two channels of the intensity-coded wide-band dual-channel compression imaging optical system, as shown in fig. 5.
Step three: denoising the two-channel shared image surface mixed image obtained in the step two, carrying out image restoration on the shared image surface mixed image through a compressed sensing restoration algorithm, and respectively restoring object side images of two imaging channels from one image, namely realizing coding compression separation imaging. The algorithm restoration flow is shown in fig. 2, and in this embodiment, the TWIST algorithm is adopted for restoration.
The inverse problem of intensity-coded wide-band dual-channel compression imaging is converted into a compressed sensing restoration problem:
And (3) taking the compressed sensing restoration problem shown in the formula (4) as an objective function of image restoration, carrying out image restoration on the common image plane mixed image through a compressed sensing restoration algorithm, and respectively restoring object side images of two imaging channels from one image, namely realizing coding compression separation imaging. The restoration effect is shown in fig. 7.
By adopting the intensity coding type wide-spectrum dual-channel compression mode for separation imaging, two separation images can be obtained, and preferably, the two separation images are spliced according to the dual-channel visual field relation, so that the visual effect of imaging is improved on the basis of expanding the visual field.
As shown in fig. 3, the invention also discloses an intensity coding type wide-spectrum dual-channel compression imaging system, which is used for realizing the intensity coding type wide-spectrum dual-channel compression imaging method. The intensity coding type wide-spectrum dual-channel compression imaging system comprises a main mirror, a first secondary mirror, a second secondary mirror, a three-mirror, a coding plate, four mirrors, five mirrors, an area array photoelectric detector and an image restoration system. The individual components are arranged in sequence in the direction of propagation of the light.
The primary mirror is positioned at the forefront end of the optical system and is used for providing certain optical power and aberration correcting capability for the two optical channels.
The first secondary mirror is positioned behind the main mirror in the light path and is an aperture diaphragm of the first secondary mirror and is used for dividing two channels and simultaneously providing certain focal power and aberration correcting capability for the first secondary mirror.
The second secondary mirror is positioned behind the main mirror in the light path and is an aperture diaphragm of the second secondary mirror and is used for dividing two channels and providing certain optical power and aberration correcting capability for the second secondary mirror.
The three mirrors are positioned behind the first secondary mirror and the second secondary mirror in the light path, are shared by the first secondary mirror and the second secondary mirror, and are used for providing certain optical power and the capability of correcting aberration for the two channels, converging light beams and imaging on an intermediate image plane.
The coding plate is positioned on the image surface of the front off-axis three-mirror system in the light path, and is equivalent to the situation that the image surface of the middle of the imaging system is increased or decreased as appropriate, the image surfaces of the middle of the first secondary mirror and the second secondary mirror are on the same plane, but cannot be overlapped, a certain offset is required, the coding plate is overlapped with the image surface, and a certain offset is provided at the position where the image surfaces of the first secondary mirror and the second secondary mirror are overlapped with the coding plate. The code board is a binary code board with random codes, and is used for providing respective coding modes for different channels.
The four mirrors are positioned behind the coding plate in the light path and form a reflective relay system together with the five mirrors for secondary imaging.
The five mirrors are positioned behind the four mirrors in the light path and form a reflective relay optical system together with the four mirrors, the reflective relay optical system needs to meet the relation of two sets of object images, and the image surfaces of the first secondary mirror and the second secondary mirror are overlapped together for secondary imaging. This requirement is easier to implement when the image plane position deviation of the first and second sub-mirrors is not large.
The area array photoelectric detector is positioned behind the imaging objective lens, is a commonly used photoelectric sensor such as CMOS or CCD, and the photosensitive surface of the area array photoelectric detector coincides with the image surface of the imaging objective lens, converts optical signals into electric signals and transmits the electric signals to the image restoration module.
The image restoration module is a single-chip microcomputer, a notebook computer and other computing terminals comprising an image restoration algorithm, and can restore digital images transmitted by photoelectric detectors such as CCD (charge coupled device) or CMOS (complementary metal oxide semiconductor) and the like through a compressed sensing restoration algorithm, so that object side images of two imaging channels are restored from one image respectively, and the algorithm is matched with the coding mode, and in the embodiment, a TWIST algorithm is adopted.
The specific optical surface parameters of the system used in this example are shown in table 1:
table 1 optical system parameter table unit: mm (mm)
| Radius of radius | Conic coefficients | y | x2 | y2 | |
| Main mirror | -210.6027 | 5.8142 | 0.1324 | 0.0025 | 0.0030 |
| First mirror | -586.9227 | -2.4033 | 0 | 0 | 0 |
| Secondary mirror | -586.9227 | -2.4033 | 0 | 0 | 0 |
| Three mirrors | -35.0819 | -0.9165 | 0.0122 | 0.0096 | 0.0097 |
| Four mirrors | 80 | 1.2441 | 0 | 0 | 0 |
| Five mirrors | -80 | -0.6724 | 0 | 0 | 0 |
The global coordinates of the optical surface in this embodiment are shown in table 2:
Table 2 optical system surface global coordinate table unit: mm (mm)
| XSC | YSC | ZSC | ASC | BSC | CSC | |
| Main mirror | 0 | 11.3090 | 72.6567 | 5.2478 | 0 | 0 |
| First mirror | 0 | -20.0000 | -0.0511 | 0 | 0 | 0 |
| Secondary mirror | 0 | -39.0000 | -0.0511 | 0 | 0 | 0 |
| Three mirrors | 0 | -44.9351 | 61.8403 | -5.0687 | 0 | 0 |
| Coding plate | 0 | 1.9179 | 15.0867 | -17.7488 | 0 | 0 |
| Four mirrors | 0 | -58.8427 | -41.1107 | -9.488 | 0 | 0 |
| Five mirrors | 0 | -80.3593 | 8.2557 | -9.488 | 0 | 0 |
| Image plane | 0 | -59.0869 | -33.1144 | 7.2512 | 0 | 0 |
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (3)
1. An intensity coding type wide-spectrum dual-channel compression imaging method is characterized in that: through intensity coding type wide-spectrum dual-channel compression imaging, single exposure is realized, dual-channel images are captured at the same time, and under the condition of the same detector, compared with a traditional alternately-operated dual-channel imaging system, the time resolution of the dual-channel compression imaging system is doubled, and under the requirement of the same imaging time resolution precision, the data size is doubled; the mixed images acquired by the two-channel shared image surface are separated in a coding compression mode, and the imaging view field is enlarged without adding a scanning device, so that the structural compactness, stability and economy of an imaging system are improved; realizing double-channel wide-spectrum imaging by adopting total reflection imaging; through intensity coding type wide-spectrum dual-channel compression imaging with a real exit pupil, the contradiction between an optical imaging view field and a focal length is solved, and concurrent imaging of a large view field and a long focal length is realized;
adopts an intensity coding type wide spectrum dual-channel compression mode for separation imaging, and the implementation method is as follows,
Step one: encoding the imaging light beams acquired by the intensity encoding type wide-spectrum dual-channel compression imaging light path on the intermediate image plane, wherein encoding modulation is realized through an encoding plate placed on the intermediate image plane, and the two intermediate image planes in the intensity encoding type wide-spectrum dual-channel compression imaging light path are required to be coplanar and cannot be completely overlapped to obtain encoded imaging light beams;
Step two: exposing the coded imaging light beam obtained in the step one through a double-channel shared image plane to obtain a double-channel shared image plane mixed image;
Step three: denoising the two-channel shared image surface mixed image obtained in the step two, carrying out image restoration on the shared image surface mixed image through a compressed sensing restoration algorithm, and respectively restoring object side images of two imaging channels from one image to realize coding compression separation imaging;
The dual-channel shared image plane refers to a dual-channel shared area array photoelectric detector for capturing a mixed image;
The intensity information i (x, y) of the mixed image captured by the area array photodetector is simplified into
i(x,y)＝f1(x,y)·coding1(x,y)+f2(x,y)·coding2(x,y) (1)
Wherein, representing point multiplication, f 1(x,y)、f2 (x, y) represents object space information captured by two channels of the intensity-coded wide-band dual-channel compression imaging optical system, coding 1(x,y)、coding2 (x, y) represents a region binary model of an encoded plate through which the two channels of the intensity-coded wide-band dual-channel compression imaging optical system pass;
In the third step, the first step is performed,
The inverse problem of intensity-coded wide-band dual-channel compression imaging is converted into a compressed sensing restoration problem:
And (3) taking the compressed sensing restoration problem shown in the formula (2) as an objective function of image restoration, carrying out image restoration on the mixed image of the common image plane through a compressed sensing restoration algorithm, and respectively restoring object side images of two imaging channels from one image, namely realizing coding compression separation imaging.
2. The intensity-coded broad-band dual-channel compression imaging method of claim 1, wherein: through the adoption of the intensity coding type wide-spectrum dual-channel compression mode for separation imaging, two separation images can be obtained, the two separation images are spliced according to the dual-channel view field relation, and the visual effect of imaging is improved on the basis of expanding the view field.
3. An intensity-coded broad-spectrum dual-channel compression imaging system for implementing an intensity-coded broad-spectrum dual-channel compression imaging method as claimed in claim 1 or 2, characterized in that: the device comprises a main mirror, a first secondary mirror, a second secondary mirror, a third mirror, a coding plate, four mirrors, five mirrors, an area array photoelectric detector and an image restoration module; in the propagation direction of the light, the components are arranged in sequence;
The main mirror is positioned at the forefront end of the optical system and is used for providing certain focal power and the capability of correcting aberration for the two optical channels;
The first secondary mirror is positioned behind the main mirror in the light path and is an aperture diaphragm of the first secondary mirror and is used for dividing two channels and simultaneously providing the first secondary mirror with preset focal power and the capability of correcting aberration;
The second secondary mirror is positioned behind the main mirror in the light path and is an aperture diaphragm of the second secondary mirror and is used for dividing two channels and simultaneously providing the second secondary mirror with preset focal power and the capability of correcting aberration;
the three mirrors are positioned behind the first secondary mirror and the second secondary mirror in the light path, are shared by the first secondary mirror and the second secondary mirror, and are used for providing preset focal power and aberration correcting capability for the two channels, converging light beams and imaging on an intermediate image surface;
The coding plate is positioned on the image surface of the front off-axis three-mirror system in the light path, the lenses of the front group of primary imaging optical lens groups are increased or decreased as appropriate according to the condition of the middle image surface of the visible system, the middle image surfaces of the first secondary lens and the second secondary lens are on the same plane but cannot be overlapped, a certain offset is required, the coding plate is overlapped with the image surface, and a certain offset exists at the position where the image surfaces of the first secondary lens and the second secondary lens are overlapped with the coding plate; the coding plate is a binary coding plate with random coding and is used for providing respective coding modes for different channels;
the four mirrors are positioned behind the coding plate in the light path and form a reflective relay system together with the five mirrors for secondary imaging;
The five mirrors are positioned behind the four mirrors in the light path and form a reflective relay optical system together with the four mirrors, the reflective relay optical system needs to meet the relation of two sets of object images, and the image surfaces of the first secondary mirror and the second secondary mirror are overlapped together for secondary imaging;
The area array photoelectric detector is positioned behind the imaging objective lens, the photosensitive surface of the area array photoelectric detector coincides with the image surface of the imaging objective lens, and optical signals are converted into electric signals and transmitted to the image restoration module;
The image restoration module comprises a singlechip and a notebook of an image restoration algorithm, restores the digital image transmitted by the photoelectric detector through the compressed sensing restoration algorithm, and respectively restores the object side images of two imaging channels from one image, wherein the algorithm is matched with the coding mode.
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| CN112665720A (en) * | 2020-12-29 | 2021-04-16 | 北京理工大学重庆创新中心 | Dual-channel tunable hyperspectral imager and method based on complementary compressed coding |
| CN113532646A (en) * | 2021-06-17 | 2021-10-22 | 北京空间机电研究所 | Full-spectrum-segment hyperspectral imaging system with high sensitivity and low distortion of static track |
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