Single-pixel cross-band imaging system and method

Abstract

The invention provides a single-pixel cross-band imaging system and method, and the system comprises an imaging lens which is used for the distortionless imaging of a target object; the first dichroscope is used for transmitting and reflecting light beams with different wave bands; the disc coding mask is used for modulating a light field to obtain a modulated first light signal and a modulated second light signal; the driving device is used for driving the disc coding mask to rotate at a constant speed; the second dichroscope is used for transmitting and reflecting light beams with different wave bands; the photoelectric detector is used for carrying out photoelectric conversion to obtain a linear photocurrent signal; the adjusting circuit is used for converting the linear light current signal into a linear voltage signal; the linear light source is used for emitting a light beam according to a linear voltage signal; and the camera is used for imaging the light beam reflected by the second dichroscope. The technical problems that in the prior art, a single-pixel imaging technology is low in imaging speed and high in cost in an invisible light wave band can be solved.

Description

Technical Field

[0001] The present invention relates to the technical fields of photoelectric detection, computational imaging and digital image processing, and in particular to a single-pixel cross-band imaging system and method. Background Art

[0002] In technologies such as computational correlation imaging, computational ghost imaging, computational quantum imaging, single-pixel cameras, structured light illumination imaging, or three-dimensional single-pixel lidar imaging, spatial light modulation devices are core devices. Spatial light modulators are used to realize the encoding of light fields, so that imaging technologies that were originally only possible with two-dimensional arrays or point-by-point scanning can be realized with a single-pixel detector. Existing single-pixel cameras generally use digital micromirror devices as modulation encoders for light fields. In recent years, some people have proposed using two-dimensional disk encoding as a spatial light field modulation device. Compared with the complex circuit system of digital micromirror devices, the cost of using the rotating disk to switch encoding is lower and the manufacturing method is easier. Therefore, compared with the imaging of array photosensitive chips, the technical advantage of single-pixel imaging is that the process of manufacturing the imaging system is simple and does not require the complex process of chip manufacturing.

[0003] Of course, imaging in the visible light band hardly requires single-pixel imaging technology. Imaging technology in the visible light band has matured. From camera chips to digital cameras, images acquired are becoming clearer and clearer, with higher resolutions. Existing visible light band cameras are relatively low-cost and have been widely used in industry, military, and daily life. However, in terms of temporal resolution, existing visible light cameras still have shortcomings. For example, in range-gated imaging, it is difficult for ordinary cameras to detect the flight time of a 10 nanosecond light pulse, and array cameras with high temporal resolution are not yet mature. Single-pixel imaging will have an advantage in this regard.

[0004] Compared with the visible light band, the existing array camera imaging technology for non-visible light bands has not yet been popularized. For example, the prices of cameras in the near-infrared and mid-wave infrared bands are still relatively high and are mainly used in industrial and military fields.

[0005] Therefore, reducing the cost of existing imaging technology in the non-visible light band and developing technical potential that existing array cameras do not have but can be achieved by single-pixel imaging are new demands facing existing imaging technology. Summary of the invention

[0006] The present invention provides a single-pixel cross-band imaging system and method, which can solve the technical problems of slow imaging speed and high cost of single-pixel imaging technology in the prior art in the non-visible light band.

[0007] According to one aspect of the present invention, a single-pixel cross-band imaging system is provided, the system comprising:

[0008] Imaging lens, used for distortion-free imaging of target objects;

[0009] A first dichroic mirror, used for transmitting an undistorted image of the target object onto the disc code mask, and also for reflecting a light beam emitted by a linear light source onto the disc code mask;

[0010] a disc coding mask having an orthogonal coding matrix engraved thereon, for modulating the light beam transmitted by the first dichroic mirror using the orthogonal coding matrix to obtain a modulated first light signal, and for modulating the light beam reflected by the first dichroic mirror using the orthogonal coding matrix to obtain a modulated second light signal;

[0011] A driving device, used for driving the disc coding mask to rotate at a constant speed;

[0012] a second dichroic mirror, for transmitting the modulated first light signal to the photodetector, and for reflecting the modulated second light signal to the camera;

[0013] a photodetector, configured to perform photoelectric conversion on the modulated first light signal transmitted through the second dichroic mirror to obtain a linear photocurrent signal;

[0014] A regulating circuit, used for converting a linear photocurrent signal into a linear voltage signal;

[0015] A linear light source, used to emit a light beam according to a linear voltage signal;

[0016] A camera is used to image the light beam reflected by the second dichroic mirror.

[0017] Preferably, the exposure time of the camera is an integer multiple of the time required for the disk code mask to rotate one circle.

[0018] Preferably, the imaging light beam of the imaging lens overlaps with the light beam emitted by the linear light source in space, and is modulated by the disk code mask in time synchronization.

[0019] Preferably, the area of ​​the spatially overlapping region between the imaging beam of the imaging lens and the beam emitted by the linear light source is less than or equal to the area of ​​the sub-code on the disc code mask, or the area of ​​the spatially overlapping region between the imaging beam of the imaging lens and the beam emitted by the linear light source is less than or equal to the number of pixels of the sub-code on the disc code mask.

[0020] Preferably, the type of the orthogonal coding matrix is ​​a cyclic orthogonal type.

[0021] Preferably, the driving device is a servo motor; the camera is a visible light camera, and the visible light camera is also used for display, storage or post-processing; and the photodetector is a photodetector of any light band.

[0022] According to another aspect of the present invention, a single-pixel cross-band imaging method is provided, wherein the method uses any of the above-mentioned systems to perform imaging, and the method comprises:

[0023] The imaging lens forms an image of the target object without distortion;

[0024] The first dichroic mirror transmits an undistorted image of the target object onto the disk-coded mask;

[0025] The driving device drives the disc coding mask to rotate at a constant speed;

[0026] The disc coding mask uses an orthogonal coding matrix to modulate the light beam transmitted through the first dichroic mirror to obtain a modulated first light signal;

[0027] The second dichroic mirror transmits the modulated first light signal to the photodetector;

[0028] The photodetector performs photoelectric conversion on the modulated first light signal transmitted through the second dichroic mirror to obtain a linear photocurrent signal;

[0029] The regulating circuit converts the linear photocurrent signal into a linear voltage signal;

[0030] The linear light source emits a light beam according to a linear voltage signal;

[0031] The first dichroic mirror reflects the light beam emitted by the linear light source onto the disk code mask;

[0032] The disc coding mask uses an orthogonal coding matrix to modulate the light beam reflected by the first dichroic mirror to obtain a modulated second light signal;

[0033] The second dichroic mirror reflects the modulated second light signal to the camera;

[0034] The camera images the light beam reflected by the second dichroic mirror.

[0035] Preferably, the disk code mask modulates the light beam transmitted through the first dichroic mirror using an orthogonal coding matrix to obtain a modulated first light signal, comprising: the disk code mask optically multiplies the transmittance of the target object with each sub-code in the orthogonal coding matrix in sequence to obtain the modulated first light signal;

[0036] The disk coding mask uses an orthogonal coding matrix to modulate the light beam reflected by the first dichroic mirror to obtain a modulated second light signal, including: the disk coding mask optically multiplies the reflectivity of the target object with each sub-code in the orthogonal coding matrix in turn to obtain a modulated second light signal.

[0037] Preferably, a linear photocurrent signal is obtained by the following formula:

[0038]

[0039] In the formula, I i is the linear photocurrent signal, h i (x, y) is the i-th sub-code of the orthogonal coding matrix, O(x, y) is the image feature of the target object, x is the horizontal pixel, and y is the vertical pixel.

[0040] Preferably, the light intensity distribution of the visible light band of the camera is obtained by the following formula:

[0041]

[0042] Where P is the light intensity distribution in the visible light band, k is a constant proportional coefficient related to the conversion circuit in the photodetector and the linear light source, and h is i (x, y) is the i-th sub-code of the orthogonal coding matrix, O(x, y) is the image feature of the target object, x is the horizontal pixel, and y is the vertical pixel.

[0043] The technical solution of the present invention is applied, and a disk mask is used as a modulation device, and encoding is performed according to a cyclic orthogonal matrix, which can save encoding space, reduce the size of the disk, and realize rapid measurement and imaging; non-visible light is converted into visible light for detection, which is not limited by the wavelength conversion range, and can realize the conversion of any band to the visible light band. The conversion circuit is simple and easy to realize, and only through optical-electrical and electro-optical conversion, the electro-optical conversion only requires ordinary incandescent lamps or LEDs; the image reconstruction is completed in the visible light camera, and the image output by the camera is the image of the object in the non-visible light band. The imaging solution process does not occupy computing resources, and only relies on the exposure time control of the visible light camera to output real-time images. The imaging system of the present invention utilizes the advantage that single-pixel imaging can be realized by all-optical computing, and uses a single-pixel detector to convert the non-visible light band through optical-electrical and electro-optical conversion, and converts the non-visible light into the visible light band to realize single-pixel imaging. This method does not require complex computing resources and has the advantages of fast speed and low cost. The imaging system of the present invention uses a visible light camera to realize imaging of non-visible light bands, such as special bands such as near-infrared, terahertz, X-rays or neutrons. Specific application scenarios include, but are not limited to, detection and imaging of methane gas, security inspection and flaw detection in the terahertz and X-ray bands, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 A schematic structural diagram of a single-pixel cross-band imaging system provided according to an embodiment of the present invention is shown;

[0046] Figure 2 A schematic diagram of a measurement basis coding pattern of size 13×153 generated by a 153-column circulant Hadamard matrix provided according to an embodiment of the present invention is shown;

[0047] Figure 3 Shows Figure 2 Each time the middle pattern moves one column to the right, a schematic diagram of a new measurement base coding pattern is formed;

[0048] Figure 4 A schematic diagram showing all measurement basis patterns of a circulant Hadamard matrix provided according to an embodiment of the present invention is shown;

[0049] Figure 5 A schematic diagram showing a measurement base coding pattern provided according to an embodiment of the present invention after being arranged in 31×927 on a disc coding mask;

[0050] Figure 6 A schematic diagram of a simulated target to be imaged with 29×31 pixels provided according to an embodiment of the present invention is shown;

[0051] Figure 7 A schematic diagram showing a target simulation imaging result of 29×31 pixels provided according to an embodiment of the present invention is shown.

[0052] The above drawings include the following reference numerals:

[0053] 1. Imaging lens; 2. Dichroic mirror; 3. Disc code mask; 4. Driving device; 5. Dichroic mirror; 6. Photodetector; 7. Adjustment circuit; 8. Linear light source; 9. Camera; 10. Target object. DETAILED DESCRIPTION

[0054] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0056] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0057] like Figure 1 As shown, the present invention provides a single-pixel cross-band imaging system, the system comprising:

[0058] An imaging lens 1, used for distortion-free imaging of a target object 10;

[0059] The first dichroic mirror 2 is used to transmit the undistorted image of the target object 10 onto the disc code mask 3, and is also used to reflect the light beam emitted by the linear light source 8 onto the disc code mask 3;

[0060] The disc coding mask 3 is engraved with an orthogonal coding matrix, which is used to modulate the light beam transmitted by the first dichroic mirror 2 using the orthogonal coding matrix to obtain a modulated first light signal, and is also used to modulate the light beam reflected by the first dichroic mirror 2 using the orthogonal coding matrix to obtain a modulated second light signal; wherein the N sub-coding h in the orthogonal coding matrix H i (i=1,2,3...N) are switched in sequence, where N is the total number of subcodes;

[0061] A driving device 4 is used to drive the disc code mask 3 to rotate at a constant speed; wherein the driving device 4 can be a servo motor;

[0062] A second dichroic mirror 5 is used to transmit the modulated first light signal to the photodetector 6, and is also used to reflect the modulated second light signal to the camera 9;

[0063] A photodetector 6, used for performing photoelectric conversion on the modulated first light signal transmitted through the second dichroic mirror 5 to obtain a linear photocurrent signal; wherein the photodetector 6 is a photodetector 6 of any light band;

[0064] A regulating circuit 7, used for converting a linear photocurrent signal into a linear voltage signal;

[0065] The linear light source 8 is used to emit a light beam according to a linear voltage signal; wherein the luminous intensity kI of the linear light source 8 is i Linearly related to the input voltage;

[0066] The camera 9 is used to image the light beam reflected by the second dichroic mirror 5; wherein the camera 9 can adopt a low-cost visible light camera 9, and the output port of the visible light camera 9 is a universal camera 9 data line output, which is also used for display, storage or post-processing.

[0067] The present invention also provides a single-pixel cross-band imaging method, which uses the above system to perform imaging, and the method comprises:

[0068] The imaging lens 1 performs distortion-free imaging of the target object 10;

[0069] The first dichroic mirror 2 transmits the undistorted image of the target object 10 onto the disc code mask 3;

[0070] The driving device 4 drives the disc coding mask 3 to rotate at a constant speed;

[0071] The disk coding mask 3 modulates the light beam transmitted through the first dichroic mirror 2 using an orthogonal coding matrix to obtain a modulated first light signal;

[0072] The second dichroic mirror 5 transmits the modulated first light signal to the photodetector 6;

[0073] The photodetector 6 performs photoelectric conversion on the modulated first light signal transmitted by the second dichroic mirror 5 to obtain a linear photocurrent signal;

[0074] The regulating circuit 7 converts the linear photocurrent signal into a linear voltage signal;

[0075] The linear light source 8 emits a light beam according to a linear voltage signal;

[0076] The first dichroic mirror 2 reflects the light beam emitted by the linear light source 8 onto the disc code mask 3;

[0077] The disc coding mask 3 modulates the light beam reflected by the first dichroic mirror 2 using an orthogonal coding matrix to obtain a modulated second light signal;

[0078] The second dichroic mirror 5 reflects the modulated second light signal to the camera 9;

[0079] The camera 9 images the light beam reflected by the second dichroic mirror 5 .

[0080] The present invention uses a disk mask as a modulation device and encodes according to a cyclic orthogonal matrix, which can save encoding space, reduce the size of the disk, and realize rapid measurement and imaging; converting non-visible light into visible light for detection, which is not limited by the wavelength conversion range and can realize the conversion of any band to the visible light band. The conversion circuit is simple and easy to realize, and only requires optical-electrical and electrical-optical conversion. The electrical-optical conversion only requires ordinary incandescent lamps or LEDs; the image reconstruction is completed in the visible light camera 9, and the image output by the camera 9 is the image of the object in the non-visible light band. The imaging solution process does not occupy computing resources, and only relies on the exposure time control of the visible light camera 9 to output real-time images. The imaging system of the present invention utilizes the advantage that single-pixel imaging can be realized by all-optical computing, and uses a single-pixel detector to convert the non-visible light band through optical-electrical and electrical-optical conversion, and converts the non-visible light into the visible light band to realize single-pixel imaging. This method does not require complex computing resources and has the advantages of fast speed and low cost. The imaging system of the present invention uses the visible light camera 9 to realize imaging in the non-visible light band, such as special bands such as near-infrared, terahertz, X-rays or neutrons. Specific application scenarios include, but are not limited to, detection and imaging of methane gas, security inspection and flaw detection in the terahertz and X-ray bands, etc.

[0081] According to an embodiment of the present invention, the disk code mask 3 modulates the light beam transmitted through the first dichroic mirror 2 using an orthogonal coding matrix to obtain a modulated first light signal, including: the disk code mask 3 optically multiplies the transmittance of the target object 10 with each sub-code in the orthogonal coding matrix in sequence to obtain the modulated first light signal;

[0082] The disk code mask 3 modulates the light beam reflected by the first dichroic mirror 2 using an orthogonal coding matrix to obtain a modulated second light signal, including: the disk code mask 3 optically multiplies the reflectivity of the target object 10 with each sub-code in the orthogonal coding matrix in turn to obtain a modulated second light signal.

[0083] According to an embodiment of the present invention, a linear photocurrent signal is obtained by the following formula:

[0084]

[0085] In the formula, I i is the linear photocurrent signal, h i (x, y) is the i-th sub-code of the orthogonal coding matrix, O(x, y) is the image feature of the target object, x is the horizontal pixel, and y is the vertical pixel.

[0086] According to an embodiment of the present invention, the light intensity distribution of the visible light band of the camera is obtained by the following formula:

[0087]

[0088] Where P is the light intensity distribution in the visible light band, k is a constant proportional coefficient related to the conversion circuit in the photodetector and the linear light source, and h is i (x, y) is the i-th sub-code of the orthogonal coding matrix, O(x, y) is the image feature of the target object, x is the horizontal pixel, and y is the vertical pixel.

[0089] According to an embodiment of the present invention, the exposure time T of the camera 9 is an integer multiple n of the time t required for the disk code mask 3 to rotate one circle (ie, rotate through a set of orthogonal codes), where n=1, 2, 3...

[0090] Specifically, when the time required for the disk code mask 3 to rotate one circle is t=T / n, the two-dimensional intensity signal accumulated on the camera 9 is nkH T HO(x,y), since the encoding matrix H is an orthogonal matrix, the two-dimensional intensity signal obtained on the camera 9 is That is, with Image intensity is the sum of the uniform DC background and the grayscale image of the object.

[0091] According to an embodiment of the present invention, the type of the orthogonal coding matrix is ​​a cyclic orthogonal type.

[0092] Specifically, the orthogonal encoding matrix may adopt a cyclic Hadamard matrix H, which has the characteristic that a new measurement basis can be generated by translating only one column of pixels, and all measurement bases are orthogonal, that is, Where I is the identity matrix.

[0093] According to an embodiment of the present invention, the imaging light beam of the imaging lens 1 coincides with the light beam emitted by the linear light source 8 in space, and is modulated by the disk code mask 3 and synchronized in time.

[0094] Specifically, the area of ​​the spatially overlapping region between the imaging light beam of the imaging lens 1 and the light beam emitted by the linear light source 8 is less than or equal to the area of ​​the sub-code on the disc code mask 3, or the area of ​​the spatially overlapping region between the imaging light beam of the imaging lens 1 and the light beam emitted by the linear light source 8 is less than or equal to the number of pixels of the sub-code on the disc code mask 3.

[0095] In order to further understand the present invention, the following Figure 2-Figure 7 The imaging system of the present invention is described in detail.

[0096] In this embodiment, the orthogonal coding matrix is ​​a cyclic Hadamard matrix, which includes N sub-codings, that is, N measurement basis coding patterns. Figure 2 As shown in FIG. 1 , a 13×153 measurement basis coding pattern generated by a 153-column cyclic Hadamard matrix is ​​shown. In the cyclic orthogonal coding matrix, a new measurement basis coding pattern is formed each time the pattern moves one column to the right, such as Figure 3 As shown. Figure 3 In the process, the coded disk mask rotates for a period t to complete the measurement of all patterns.

[0097] According to an embodiment of the present invention, the actual encoding size of the disk code mask 3 is preferably 29×31, and the size of the circulant Hadamard matrix is ​​899×899. Figure 4 shown.

[0098] According to an embodiment of the present invention, the actual encoding size of the disk code mask 3 is preferably 29×31, and the size of the circulant Hadamard matrix is ​​29×31×899, which is arranged in 31×927 behind the disk code mask 3, as shown in FIG. Figure 5 As shown, the size of each pixel is determined according to the actual application.

[0099] According to an embodiment of the present invention, the imaging system of the present invention is used to image the target object 10. Figure 6 The imaging result obtained by computer simulation for the target image is as follows Figure 7 shown.

[0100] In summary, the present invention provides a single-pixel cross-band imaging system and method, which uses a disk mask as a modulation device and encodes according to a cyclic orthogonal matrix, which can save encoding space, reduce the size of the disk, and achieve rapid measurement and imaging; converting non-visible light into visible light for detection, which is not limited by the wavelength conversion range and can achieve conversion from any band to the visible light band. The conversion circuit is simple and easy to implement, and only requires optical-electrical and electrical-optical conversion. The electrical-optical conversion only requires ordinary incandescent lamps or LEDs; the image reconstruction is completed in the visible light camera 9, and the image output by the camera 9 is the image of the object in the non-visible light band. The imaging solution process does not occupy computing resources, and only relies on the exposure time control of the visible light camera 9 to output real-time images. The imaging system of the present invention takes advantage of the fact that single-pixel imaging can be achieved through all-optical computing, and uses a single-pixel detector to convert the non-visible light band through optical-electrical and electrical-optical conversion, and converts the non-visible light into the visible light band to achieve single-pixel imaging. This method does not require complex computing resources and has the advantages of fast speed and low cost. The imaging system of the present invention uses a visible light camera 9 to achieve imaging in non-visible light bands, such as special bands such as near infrared, terahertz, X-rays or neutrons. Specific application scenarios include, but are not limited to, detection and imaging of methane gas, security inspection and flaw detection in terahertz and X-ray bands, etc.

[0101] Parts of the present invention that are not described in detail are well known to those skilled in the art.

[0102] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0103] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0104] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A single-pixel cross-band imaging system, characterized in that: The system comprises: Imaging lens, used for distortion-free imaging of target objects; A first dichroic mirror, used for transmitting an undistorted image of the target object onto the disc code mask, and also for reflecting a light beam emitted by a linear light source onto the disc code mask; a disc coding mask having an orthogonal coding matrix engraved thereon, for modulating the light beam transmitted by the first dichroic mirror using the orthogonal coding matrix to obtain a modulated first light signal, and for modulating the light beam reflected by the first dichroic mirror using the orthogonal coding matrix to obtain a modulated second light signal; A driving device, used for driving the disc coding mask to rotate at a constant speed; a second dichroic mirror, for transmitting the modulated first light signal to the photodetector, and for reflecting the modulated second light signal to the camera; a photodetector, configured to perform photoelectric conversion on the modulated first light signal transmitted through the second dichroic mirror to obtain a linear photocurrent signal; A regulating circuit, used for converting a linear photocurrent signal into a linear voltage signal; A linear light source, used to emit a light beam according to a linear voltage signal; A camera is used to image the light beam reflected by the second dichroic mirror.

2. The system according to claim 1, characterized in that The exposure time of the camera is an integral multiple of the time required for the disk coding mask to rotate one circle.

3. The system according to claim 1 or 2, characterized in that: The imaging light beam of the imaging lens overlaps with the light beam emitted by the linear light source in space, and is modulated by the disk coding mask and synchronized in time.

4. The system according to claim 3, characterized in that The area of ​​the spatially overlapping region between the imaging light beam of the imaging lens and the light beam emitted by the linear light source is less than or equal to the area of ​​the sub-code on the disc code mask, or the area of ​​the spatially overlapping region between the imaging light beam of the imaging lens and the light beam emitted by the linear light source is less than or equal to the number of pixels of the sub-code on the disc code mask.

5. The system according to claim 1, characterized in that The type of the orthogonal coding matrix is ​​a cyclic orthogonal type.

6. The system according to any one of claims 1 to 5, characterized in that: The driving device is a servo motor; the camera is a visible light camera, and the visible light camera is also used for display, storage or post-processing; the photoelectric detector is a photoelectric detector of any light band.

7. A single-pixel cross-band imaging method, characterized in that: The method uses any system described in claims 1-6 to perform imaging, and the method comprises: The imaging lens forms an image of the target object without distortion; The first dichroic mirror transmits an undistorted image of the target object onto the disk-coded mask; The driving device drives the disc coding mask to rotate at a constant speed; The disc coding mask uses an orthogonal coding matrix to modulate the light beam transmitted through the first dichroic mirror to obtain a modulated first light signal; The second dichroic mirror transmits the modulated first light signal to the photodetector; The photodetector performs photoelectric conversion on the modulated first light signal transmitted through the second dichroic mirror to obtain a linear photocurrent signal; The regulating circuit converts the linear photocurrent signal into a linear voltage signal; The linear light source emits a light beam according to a linear voltage signal; The first dichroic mirror reflects the light beam emitted by the linear light source onto the disk code mask; The disc coding mask uses an orthogonal coding matrix to modulate the light beam reflected by the first dichroic mirror to obtain a modulated second light signal; The second dichroic mirror reflects the modulated second light signal to the camera; The camera images the light beam reflected by the second dichroic mirror.

8. The method according to claim 7, characterized in that The disk coding mask modulates the light beam transmitted through the first dichroic mirror using an orthogonal coding matrix to obtain a modulated first light signal, including: the disk coding mask optically multiplies the transmittance of the target object with each sub-code in the orthogonal coding matrix in sequence to obtain the modulated first light signal; The disk coding mask uses an orthogonal coding matrix to modulate the light beam reflected by the first dichroic mirror to obtain a modulated second light signal, including: the disk coding mask optically multiplies the reflectivity of the target object with each sub-code in the orthogonal coding matrix in turn to obtain a modulated second light signal.

9. The method according to claim 7, characterized in that: The linear photocurrent signal is obtained by the following formula: In the formula, I i is the linear photocurrent signal, h i (x, y) is the i-th sub-code of the orthogonal coding matrix, O(x, y) is the image feature of the target object, x is the horizontal pixel, and y is the vertical pixel.

10. The method according to claim 7, characterized in that The light intensity distribution of the camera's visible light band is obtained by the following formula: Where P is the light intensity distribution in the visible light band, k is a constant proportional coefficient related to the conversion circuit in the photodetector and the linear light source, and h is i (x, y) is the i-th sub-code of the orthogonal coding matrix, O(x, y) is the image feature of the target object, x is the horizontal pixel, and y is the vertical pixel.

Images