Coding disc and single-pixel imaging system comprising same

Abstract

The invention relates to an encoding disk and a single-pixel imaging system including the same. An encoding disk for single-pixel imaging may include: a disk body; the first coding area is located on the disc body, the first coding area comprises a first coding pattern area located in a first code channel on the disc body and a first reference area located in a second code channel, the first coding pattern area comprises a coding pattern formed by a transmission area and a non-transmission area, the first reference area is a full-transmission area, and the first reference area is a non-transmission area. The first coding pattern area and the first reference area are adjacent in the radial direction of the disc body and continuously extend by the same circumferential angle in the circumferential direction.

Description

Technical Field

[0001] The present invention generally relates to imaging technology, and more particularly, to an encoding disk and an interference-resistant, variable-resolution single-pixel imaging system based on rotational encoding. Background Art

[0002] In single-pixel imaging, computational imaging, structured light illumination and other systems, light field modulation is a necessary link. The commonly used light field modulation device is the digital micromirror device (DMD), which is mainly produced by National Instruments (NI). One of its commonly used products has a resolution of 768×1024 and each micromirror has a size of 13.7×13.7μm. 2 The entire array area is 14.0×10.5mm 2 , with a typical refresh rate of 22kHz. The refresh rate of spatial light modulators is a key factor affecting the imaging effect. The existing modulation speed is far from meeting the imaging requirements for fast-moving objects. At the same time, single-pixel imaging systems based on spatial modulators also have certain limitations on the optical band. The active array area consists of a large rectangular array of aluminum micromirrors, which have a nominal reflectivity of 89% in the visible light range (420nm to 680nm), which will reduce optical transmittance when used in imaging systems.

[0003] The single-pixel imaging system based on mask modulation fills the problems of low refresh speed and low transmittance caused by the use of DMD devices, and can achieve fast single-pixel imaging, which greatly improves the practicality of the single-pixel imaging system and has also been widely used in non-optical fields such as X-rays and terahertz waves. However, the existing rotating mask single-pixel imaging system adopts a transmissive single-pixel imaging method, which has poor anti-interference ability, and the existing design scheme only uses a single-resolution image for light field modulation, and the imaging can only achieve a single resolution. Summary of the invention

[0004] The present invention is proposed in view of the above problems.

[0005] One aspect of the present invention provides a coding disk for single-pixel imaging, comprising: a disk body; a first coding area located on the disk body, the first coding area including a first coding pattern area in a first code channel located on the disk body and a first reference area in a second code channel, the first coding pattern area including a coding pattern formed by a transmission area and a non-transmission area, the first reference area being a fully transmission area, the first coding pattern area and the first reference area being adjacent in a radial direction of the disk body, and extending continuously in a circumferential direction at the same circumferential angle.

[0006] In one embodiment, the encoding disk further comprises: a second encoding area located on the disk body, the second encoding area comprises a second encoding pattern area in the first code track on the disk body and a second reference area in the second code track, the second encoding pattern area comprises an encoding pattern formed by a transmission area and a non-transmission area, the second reference area is a full transmission area, the second encoding pattern area and the second reference area are adjacent in the radial direction of the disk body, and extend continuously in the circumferential direction at the same circumferential angle. The first encoding area and the second encoding area are separated from each other in the circumferential direction of the disk body.

[0007] In one embodiment, the coding pattern in the first coding pattern area has a first resolution, and the coding pattern in the second coding pattern area has a second resolution, and the first resolution is different from the second resolution.

[0008] In one embodiment, the first coding pattern area, the first reference area, the second coding pattern area and the second reference area have the same width in the radial direction of the disk body, the first coding pattern area and the second coding pattern area are aligned with each other in the circumferential direction, and the first reference area and the second reference area are aligned with each other in the circumferential direction.

[0009] Another aspect of the present invention provides a single-pixel imaging system, comprising: the above-mentioned encoding disk; a driving device for driving the encoding disk to rotate; an imaging lens group for focusing a light beam from an imaging target to a first code channel of the encoding disk; a beam splitter for guiding a portion of the light beam focused by the imaging lens group to a second code channel of the encoding disk; a first single-pixel detector for detecting light transmitted through the first code channel of the encoding disk and providing a first signal; a second single-pixel detector for detecting light transmitted through the second code channel of the encoding disk and providing a second signal; a data acquisition module for acquiring a first signal from the first single-pixel detector and a second signal from the second single-pixel detector; and an image reconstruction module for reconstructing an image of the imaging target based on a differential signal between the first signal and the second signal.

[0010] In one embodiment, the single-pixel imaging system further includes: a differential module configured to receive a first signal provided by the first single-pixel detector and a second signal provided by the second single-pixel detector, form a differential signal, and provide the differential information to the data acquisition module.

[0011] In one embodiment, the single-pixel imaging system further includes: a synchronization module associated with the driving device, and when the driving device drives the encoding disk to rotate, the synchronization module generates a synchronization signal corresponding to the time when the encoding area on the encoding disk passes through the first single-pixel detector and the second single-pixel detector, and provides the synchronization signal to the data acquisition module.

[0012] In one embodiment, the image reconstruction module determines a portion of the differential signal corresponding to an encoding region of the encoding disk based on the synchronization signal, and reconstructs the image of the imaging target from the determined portion of the differential signal.

[0013] In one embodiment, when the encoding disk includes a first encoding region and a second encoding region, the image reconstruction module determines a first part corresponding to the first encoding region and a second part corresponding to the second encoding region in the differential signal based on the synchronization signal, reconstructs a first image of the imaging target with a first resolution from the first part of the differential signal, and reconstructs a second image of the imaging target with a second resolution from the second part of the differential signal.

[0014] The present invention reconstructs the image of the imaging target by using the differential signal of the signal collected from different code channels, which can offset the noise in the collected signal and has the advantage of strong anti-interference ability. In addition, by using coding patterns with different resolutions in different areas of the coding disk, a variety of imaging results with different resolutions can be achieved, further improving the practicality of the technology.

[0015] The above and other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of an encoding disk for single-pixel imaging according to an embodiment of the present invention.

[0017] Figure 2 is a schematic diagram of a coding pattern area and a coding pattern of a coding disk according to an embodiment of the present invention.

[0018] Figure 3 is a schematic diagram of a single-pixel imaging system according to an embodiment of the present invention.

[0019] Figure 4 is a schematic diagram of a single-pixel imaging system according to another embodiment of the present invention.

[0020] Figure 5 is a schematic diagram of a single-pixel imaging system according to another embodiment of the present invention.

[0021] Figure 6 is a schematic diagram of a synchronization signal corresponding to a coding area according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] Exemplary embodiments of the present invention are described below with reference to the accompanying drawings.

[0023] Figure 1 FIG. 1 is a schematic diagram of an encoding disk 100 for single pixel imaging according to an embodiment of the present invention. Figure 1 In the encoding disk 100 shown, multiple encoding areas with different resolutions are set up, so that imaging images with different resolutions can be provided; and each encoding area includes a coding pattern area and a fully transmitted reference area, and two imaging signals are formed by using the coding pattern area and the fully transmitted reference area, and then their differential signal can be obtained for image reconstruction, which can eliminate noise interference in the imaging signal and improve the imaging quality.

[0024] like Figure 1 As shown, the encoder disk 100 may include a disk body 101. The disk body 101 may be opaque, for example, including an opaque material layer covering a transparent body. The transparent body may include plastic, glass, quartz, etc. The opaque material may include, for example, but not limited to, a metal layer. The disk body 101 may have a disc shape, and a positioning hole 102 may be formed at the center of the circle for fixing the disk body 101 to a driving mechanism to quickly rotate the disk body 101. The positioning hole 102 is not limited to Figure 1 The circular shape shown is not intended to be confused with the circular shape, but may have any other shape.

[0025] exist Figure 1 In the illustrated embodiment, the disc body 101 may be provided with a first coding region 110 and a second coding region 120, but it should be understood that only one of the first coding region 110 and the second coding region 120 may be provided, or more coding regions may be provided. The first coding region 110 may include a first coding pattern region 111 located in a first code channel and a first reference region 112 located in a second code channel. The code channel is a plurality of circular ring shapes divided along the radial direction, Figure 1, the first (outer) code channel and the second (inner) code channel are shown to be adjacent to each other, and they may have the same width. The first coding pattern area 111 is preferably located in the first code channel on the outside to have a larger coding area, but the first coding pattern area 111 may also be set in the second code channel on the inside, and the first reference area 112 may be set in the first code channel on the outside. The first coding pattern area 111 may include a coding pattern formed by a transmission area and a non-transmission area, which will be described in further detail below, and the first reference area 112 may be a full transmission area. It can be understood that the transmission area can be formed by removing the opaque material layer on the disc body 101. The first coding pattern area 111 and the first reference area 112 in the first coding area 110 can extend continuously at the same circumferential angle in the circumferential direction of the disc body 101.

[0026] Similarly, the second coding area 120 may include a second coding pattern area 121 located in the first code track on the disc body 101 and a second reference area 122 located in the second code track. The second coding pattern area 121 includes a coding pattern formed by a transmission area and a non-transmission area, the second reference area 122 is a full transmission area, the second coding pattern area 121 and the second reference area 122 are adjacent in the radial direction of the disc body 101, and extend continuously in the circumferential direction at the same circumferential angle. The first coding pattern area 111 and the second coding pattern area 121 are aligned with each other in the circumferential direction, the first reference area 112 and the second reference area 122 are aligned with each other in the circumferential direction, and the first coding pattern area 111, the first reference area 112, the second coding pattern area 121 and the second reference area 122 may have the same width in the radial direction of the disc body 101. The first coding area 110 and the second coding area 120 are separated from each other in the circumferential direction of the disk body 101, and the separation area can be used as an alignment area to align the signal formed by the first coding pattern area 111 and the first reference area 112, and to align the signal formed by the second coding pattern area 121 and the second reference area 122, which will be described in detail later.

[0027] Figure 2 The schematic diagram of the first coding pattern area 111 and the coding pattern of the coding disk 100 according to an embodiment of the present invention is shown schematically, wherein for convenience, the first coding pattern area 111 is shown as a rectangular strip shape, but in fact Figure 1It is shown as a ring shape. As shown in the figure, the first coding pattern area 111 includes a transmission area (i.e., a transparent area) and a non-transmission area (for example, a reflection area), wherein the transmission area may be an area where the opaque (e.g., reflection) covering layer on the disk body 101 is removed, and the non-transmission area may be an area where the opaque (e.g., reflection) covering layer is retained. In one embodiment, the coding pattern in the first coding pattern area 111 may be a Hadamard coding pattern, which may also be referred to as a mask pattern. Taking the Hadamard coding pattern as an example, a cyclic Hadamard matrix of X rows and Y columns may be constructed based on a cyclic orthogonal matrix such as a cyclic S matrix. The cyclic S matrix is ​​a square matrix whose dimension n is constrained by the Hadamard matrix (i.e., the H matrix) and is an odd number. For example, the n+1-order H matrix may be normalized by performing elementary row and column changes, and the first row and first column elements after normalization are all 1; the first row and first column of the normalized n+1-order H matrix are deleted, and all 1 elements in the obtained n-order square matrix are set to 0, and the -1 elements are set to 1, and the n-order S matrix can be obtained. Methods for constructing a circulant Hadamard matrix from an n-order S matrix may include, for example, a quadratic remainder algorithm, an m-sequence algorithm, and a twin prime algorithm, which are all known algorithms and will not be discussed in detail one by one. Taking the imaging image resolution of X rows and A columns as an example, each image includes M=X×A pixels, and a circulant Hadamard matrix of X rows and Y columns can be constructed, where Y=M+A-1, and the submatrix of X rows and A columns from the yth column to the y+A-1th column in the circulant Hadamard matrix is ​​a minimum coding unit, where matrix element 1 may correspond to the transmission area in the coding pattern, and matrix element 0 may correspond to the non-transmission area in the coding pattern. For example, Figure 2 The i-th minimum coding unit is shown, and the next (i+1) minimum coding unit along the scanning direction can at least partially repeat the previous (i-th) minimum coding unit, that is, include one or more identical columns, and can include at most A-1 identical columns. Therefore, for the imaging image size of X rows and A columns, including M pixels, when M minimum coding units (X rows and A columns) are arranged in an overlapping manner, a coding matrix of X rows and M+A-1 columns is formed. The light beam from the imaging object forms a speckle that is irradiated onto the minimum coding unit (X rows and A columns) through the optical system, which is detected by a single-pixel detector to generate a signal; when the encoding disk 100 rotates, M signals corresponding to the M minimum coding units are generated, and the imaging image of X rows and A columns can be reconstructed based on these M signals. It should be understood that the encoding method of the encoding pattern area is not limited to the cyclic Hadamard matrix, but other methods can also be used. The present invention does not impose any special restrictions on this, as long as it can be decoded accordingly.

[0028] From the perspective of facilitating decoding, the first coding pattern area 111 of the first coding area 110 and the second coding pattern area 121 of the second coding area 120 can be encoded in a similar manner, for example, both are encoded using a cyclic Hadamard matrix. In some embodiments, the first coding pattern area 111 and the second coding pattern area 121 can have different resolutions, for example, the resolution of the second coding pattern area 121 can be greater than the resolution of the first coding pattern area 111. For example, the first coding pattern area 111 can be used to form an image with 31 rows and 29 columns, that is, its minimum coding unit corresponds to a matrix of 31 rows and 29 columns, including 31×29=899 pixels, then the entire first coding pattern area 111 corresponds to a matrix of 31×927, where 927=899+29-1; the second coding pattern area 121 can be used to form an image with 61 rows and 59 columns, that is, its minimum coding unit corresponds to a matrix of 61 rows and 59 columns, including 61×59=3599 pixels, then the entire second coding pattern area 121 corresponds to a matrix of 61×3657, where 3657=3599+59-1. The numbers given here are only examples, and the first coding pattern area 111 and the second coding pattern area 121 can use other resolutions.

[0029] It should also be understood that although Figure 1 The encoder disk 100 is shown to include two encoding pattern areas with different resolutions. In some embodiments, the encoder disk 100 may further include more encoding pattern areas with different resolutions.

[0030] The following describes single-pixel imaging systems according to some embodiments of the present invention. Figure 3 Schematic diagram of a single pixel imaging system 200 is shown. Figure 3 As shown, the single-pixel imaging system 200 may include an imaging lens group 201 and a beam splitter 202. The imaging lens group 201 may include a plurality of lenses, such as a convex lens and a concave lens, for focusing a light beam from the imaging target 1 onto a first code channel of the encoding disk 100. It is generally required that the image focused by the imaging lens group 201 is free of aberration, chromatic aberration, distortion, etc., and in some embodiments, it can be used for imaging in visible light, infrared light, and / or terahertz bands. The beam splitter 202 is configured to guide a portion of the light beam focused by the imaging lens group 201 to a second code channel of the encoding disk 100. The encoding disk 100 may be the above-referenced Figure 1-2The described encoder disk is rotated by the driving device 208, and the driving device 208 can drive the encoder disk 100 to rotate at a high speed, uniform speed and stably, and may include, for example, a brushless motor and a corresponding driving circuit. When the light beam is irradiated on the first coding pattern area 111 in the first code track of the encoder disk 100, the transmitted light beam is detected by the first single pixel detector 203, and a signal CH1 is generated; when the light beam is irradiated on the first reference area 112 in the second code track of the encoder disk 100, the transmitted light beam is detected by the second single pixel detector 204, and a signal CH2 is generated. Similarly, when the light beam is irradiated on the second coding pattern area 121 in the first code track of the encoder disk 100, the transmitted light beam is detected by the first single pixel detector 203, and a signal CH3 is generated; when the light beam is irradiated on the second reference area 122 in the second code track of the encoder disk 100, the transmitted light beam is detected by the second single pixel detector 204, and a signal CH4 is generated. Signals CH1, CH2, CH3 and CH4 can be voltage signals or current signals. It should be understood that, since the first encoding region 110 and the second encoding region 120 are separated by the non-transmission region, the signal CH1 and the signal CH3 generated by the first single-pixel detector 203 are separated by the signal-free region (no valid signal, but there may be a noise signal) corresponding to the non-transmission spacer region, and the signal CH2 and the signal CH4 generated by the second single-pixel detector 204 are also separated by the signal-free region (no valid signal, but there may be a noise signal) corresponding to the non-transmission spacer region. Therefore, the signal-free region can be used to align the signal CH1 and the signal CH3 to the signal CH2 and the signal CH4, respectively.

[0031] The first signal (including signal CH1 and signal CH3) generated by the first single-pixel detector 203 and the second signal (including signal CH2 and signal CH4) generated by the second single-pixel detector 204 can be provided to the differential module 205, which can subtract the analog voltage or current signal provided by the first single-pixel detector 203 and the second single-pixel detector 204 to obtain a differential signal, namely, signal CH2-CH1 and signal CH4-CH3. Through the differential operation of the differential module 205, the noise interference in the first signal (including signal CH1 and signal CH3) generated by the first single-pixel detector 203 and the second signal (including signal CH2 and signal CH4) generated by the second single-pixel detector 204 can be offset, thereby helping to improve the anti-interference ability of the single-pixel imaging system and provide higher quality image reconstruction. In some embodiments, if the signals generated by the first single-pixel detector 203 and the second single-pixel detector 204 are weak, a signal amplification circuit may be further included to amplify the signal before providing it to the differential module 205, or to amplify the differential signal generated by the differential module 205. Then, the differential signal may be collected and stored by the data acquisition module 206. For example, the data acquisition module 206 may include an analog-to-digital converter (ADC) that converts the differential signal into a digital signal and stores it in a memory.

[0032] In one embodiment, the single pixel imaging system 200 may further include an image reconstruction module 207, which is used to reconstruct the image of the imaging target 1 based on the differential signal. For example, the image reconstruction module 207 may reconstruct the first image of the imaging target 1 based on the differential signal (CH2-CH1), and reconstruct the second image of the imaging target 1 based on the differential signal (CH4-CH3), and the first image and the second image may have different resolutions, which depend on the resolutions of the minimum coding units of the first coding pattern area 111 and the second coding pattern area 121, respectively. In one embodiment, the image reconstruction module 207 may reconstruct the image vector IMG according to the following formula:

[0033]

[0034] Where iFFT() represents inverse Fourier transform, FFT() represents Fourier transform, I b represents the differential signal for image reconstruction, and H1 represents the first row vector of the cyclic Hadamard matrix corresponding to the differential signal. It should be understood that the image reconstruction module 207 can reconstruct the differential signal (CH2-CH1) and the differential signal (CH4-CH3) respectively, which correspond to different coding patterns, that is, to different cyclic Hadamard matrices.

[0035] Figure 4 is a schematic diagram of a single pixel imaging system 200a according to another embodiment of the present invention. Figure 3Compared with the single-pixel imaging system 200 shown in FIG. 2 , the single-pixel imaging system 200a includes many identical or similar components, and repeated descriptions thereof will be omitted below, and the differences between the two will be mainly described.

[0036] like Figure 4 As shown, the single-pixel imaging system 200a may not include the differential module 205, so the first signal (including the signal CH1 and the signal CH3) generated by the first single-pixel detector 203 and the second signal (including the signal CH2 and the signal CH4) generated by the second single-pixel detector 204 can be collected by the data acquisition module 206 and stored in the memory. This facilitates further processing of the original detection signal, for example, aligning the signal CH1 and the signal CH3 generated by the first single-pixel detector 203 to the signal CH2 and the signal CH4 generated by the second single-pixel detector 204, respectively, to generate an accurate differential signal. The image reconstruction module 207 can generate differential signals based on the first signal (including the signal CH1 and the signal CH3) provided by the first single-pixel detector 203 and the second signal (including the signal CH2 and the signal CH4) provided by the second single-pixel detector 204, that is, the differential signal (CH2-CH1) and the differential signal (CH4-CH3), and then perform image reconstruction according to the above formula to obtain the images generated by the first encoding region 110 and the second encoding region 120, respectively. As mentioned above, the two can have different resolutions.

[0037] Figure 5 is a schematic diagram of a single pixel imaging system 200b according to another embodiment of the present invention. Figure 3 Compared with the single-pixel imaging system 200 shown in FIG. 1 , the single-pixel imaging system 200 b includes many identical or similar components, and repeated descriptions thereof will be omitted below, and the differences between the two components will be mainly described.

[0038] like Figure 5 As shown, the single pixel imaging system 200b may further include a synchronization module 209 associated with the driving device 208. When the driving device 208 drives the encoder disk 100 to rotate, the synchronization module 209 may generate a synchronization signal corresponding to the position of the encoder disk 100, or more precisely, the positions of the first and second encoding regions 110, 120 on the encoder disk 100. Figure 6A schematic diagram of the synchronization signal corresponding to the first and second coding regions 110 and 120 is shown. When the positions of the first and second coding regions 110 and 120 overlap with the first and second single-pixel detectors 203 and 204, the first and second single-pixel detectors 203 and 204 can detect the light signal transmitted through the first and second coding regions 110 and 120, and the synchronization signal can be at a high level at this time; when the positions of the first and second coding regions 110 and 120 do not overlap with the first and second single-pixel detectors 203 and 204, the light cannot pass through the first and second coding regions 110 and 120 to reach the first and second single-pixel detectors 203 and 204, that is, the first and second single-pixel detectors 203 and 204 cannot detect the effective signal, and the synchronization signal can be at a low level at this time. The synchronization signal can also be collected by the data acquisition module 206 and stored in the memory. Then, the image reconstruction module 207 can determine the portion of the differential signal corresponding to the coding region of the coding disk based on the synchronization signal, that is, the effective signal portion of the differential signal corresponding to the high level of the synchronization signal, and reconstruct the image of the imaging target 1 from the determined effective signal portion of the differential signal. It can be understood that the portion of the differential signal corresponding to the low level of the synchronization signal is a signal corresponding to the non-transmitting interval portion between the first encoding region 110 and the second encoding region 120, which cannot be used for image reconstruction. By using the synchronization signal, the effective signal portion in the differential signal can be more accurately identified, thereby improving the quality of the reconstructed image.

[0039] It should be understood that Figure 5 and 6 In the embodiment shown, the differential module 205 may be omitted, and the data acquisition module 206 may acquire and store signals from the first single pixel detector 203, the second single pixel detector 204 and the synchronization module 209, and then the image reconstruction module 207 generates a differential signal between the first signal provided by the first single pixel detector 203 and the second signal provided by the second single pixel detector 204 based on the synchronization signal, and uses the differential signal to reconstruct the image. Figure 4 The description has been given and will not be repeated here.

[0040] As described above, the image reconstruction module 207 can reconstruct the first image based on the differential signal associated with the first coding area 110, and reconstruct the second image based on the differential signal associated with the second coding area 120, and the first image and the second image can have different resolutions, depending on the resolution of the minimum coding unit in each coding area. Therefore, images of different resolutions can be provided through a single imaging operation. In some embodiments, the image reconstruction module 207 can also combine and superimpose different parts of the high-resolution image and the low-resolution image to form an image with special effects such as different areas having different sharpness, such as a central part having higher sharpness and a surrounding part having lower sharpness.

[0041] Unless the context clearly requires otherwise, throughout the specification and claims, the words "comprise", "comprising", "including", "comprising", etc. should be interpreted in an inclusive sense, rather than an exclusive or exhaustive sense. That is, the meaning is "including but not limited to". The word "connected" as generally used herein refers to two or more elements that can be directly connected or connected through one or more intermediate elements. As generally used herein, the word "connected" refers to two or more elements that can be directly connected or connected through one or more intermediate elements. In addition, when used in this application, the words "herein", "above", "below" and words of similar meanings should refer to the entirety of this application rather than to any particular part of this application. Where the context permits, the word "or" refers to a list of two or more items, which covers all of the following interpretations of the word: any item in the list, all items in the list, and any combination of items in the list.

[0042] Furthermore, unless otherwise specifically stated or understood in the context of use, conditional language used herein, such as "can," "may," "might," "could," "for example," "for example," "such as," and the like, is generally intended to convey that certain embodiments include, while other embodiments do not include, certain features, elements, and / or states. Thus, such conditional language is generally not intended to imply that one or more embodiments require features, elements, and / or states in any way, or that one or more embodiments must include logic for making decisions, with or without author input or prompting, that such features, elements, and / or states are included or will be performed in any particular embodiment.

[0043] Although certain embodiments have been described, these embodiments are presented only by way of example and are not intended to limit the scope of the present disclosure. In fact, the novel facilities, methods, and systems described herein may be embodied in various other forms; in addition, various omissions, substitutions, and changes may be made to the forms of the methods and systems described herein without departing from the spirit of the present disclosure. For example, although blocks are presented in a given arrangement, alternative embodiments may perform functions similar to different components and / or circuit topologies, and may delete, move, add, subdivide, combine, and / or modify some blocks. Each of these blocks may be implemented in a variety of different ways. Any suitable combination of the elements and actions of the various embodiments described above may be combined to provide further embodiments. The attached claims and their equivalents are intended to cover these forms or modifications that fall within the scope and spirit of the present disclosure.

[0044] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A coding disk for single-pixel imaging, comprising: Plate body (101); A first coding area (110) located on the disk body, the first coding area (110) comprising a first coding pattern area (111) in a first code track on the disk body (101) and a first reference area (112) in a second code track, the first coding pattern area (111) comprising a coding pattern formed by a transmission area and a non-transmission area, the first reference area (112) being a full transmission area, the first coding pattern area (111) and the first reference area (112) being adjacent in a radial direction of the disk body (101), and extending continuously in a circumferential direction at the same circumferential angle.

2. The encoder disk according to claim 1, further comprising: a second coding area (120) located on the disk body, the second coding area (120) comprising a second coding pattern area (121) located in a first code track on the disk body (101) and a second reference area (122) located in the second code track, the second coding pattern area (121) comprising a coding pattern formed by a transmission area and a non-transmission area, the second reference area (122) being a full transmission area, the second coding pattern area (121) and the second reference area (122) being adjacent in a radial direction of the disk body (101), and continuously extending in a circumferential direction at the same circumferential angle, The first coding region (110) and the second coding region (120) are separated from each other in the circumferential direction of the disk body (101).

3. The encoding disk according to claim 2, wherein: The coding pattern in the first coding pattern area (111) has a first resolution, and the coding pattern in the second coding pattern area (121) has a second resolution, and the first resolution is different from the second resolution.

4. The encoding disk according to claim 2, wherein: The first coding pattern area (111), the first reference area (112), the second coding pattern area (121) and the second reference area (122) have the same width in the radial direction of the disk body (101), the first coding pattern area (111) and the second coding pattern area (121) are aligned with each other in the circumferential direction, and the first reference area (112) and the second reference area (122) are aligned with each other in the circumferential direction.

5. A single pixel imaging system, comprising: The code disc (100) according to any one of claims 1 to 4; A driving device (208) for driving the encoding disk (100) to rotate; An imaging lens group (201), used for focusing a light beam from an imaging target onto a first code track of the encoding disk; A beam splitter (202) for guiding a portion of the light beam focused by the imaging lens group (201) to a second code track of the encoding disk; A first single-pixel detector (203), used for detecting light transmitted through a first code track of the encoding disk and providing a first signal; A second single-pixel detector (204) for detecting light transmitted through a second code track of the encoding disk and providing a second signal; A data acquisition module (206) for acquiring a first signal from the first single-pixel detector (203) and a second signal from the second single-pixel detector (204); as well as An image reconstruction module (207) is used to reconstruct the image of the imaging target based on a differential signal between the first signal and the second signal.

6. The single pixel imaging system of claim 5, further comprising: The differential module (205) is configured to receive a first signal provided by the first single-pixel detector (203) and a second signal provided by the second single-pixel detector (204), form a differential signal, and provide the differential information to the data acquisition module (206).

7. The single pixel imaging system of claim 5, further comprising: A synchronization module (209) associated with the driving device (208) generates a synchronization signal corresponding to the time when the encoding area (110, 120) on the encoding disk (100) passes through the first single-pixel detector (203) and the second single-pixel detector (204) when the driving device (208) drives the encoding disk (100) to rotate, and provides the synchronization signal to the data acquisition module (206).

8. The single pixel imaging system of claim 7, wherein: The image reconstruction module (207) determines a portion of the differential signal corresponding to the encoding region of the encoding disk based on the synchronization signal, and reconstructs the image of the imaging target from the determined portion of the differential signal.

9. The single pixel imaging system of claim 7, wherein: When the encoding disk (100) includes a first encoding region (110) and a second encoding region (120), the image reconstruction module (207) determines a first part of the differential signal corresponding to the first encoding region (110) and a second part corresponding to the second encoding region (120) based on the synchronization signal, reconstructs a first image of the imaging target with a first resolution from the first part of the differential signal, and reconstructs a second image of the imaging target with a second resolution from the second part of the differential signal.

Images