Camera channel crosstalk elimination device and method based on color primitive hologram

Abstract

The invention relates to a camera channel crosstalk elimination device and method based on a color primitive hologram, and belongs to the technical field of color digital holography. The device comprises a red laser, a green laser, a blue laser, a reflector, a beam splitter, a beam expander, a Fourier lens and a dichroic sheet. A red laser beam, a green laser beam and a blue laser beam are split into three pairs of object light and reference light, and the object light and the reference light are expanded and collimated into plane waves; the red, green and blue object light and the reference light are interfered, and red, green and blue three-element holograms with different frequencies and angles are generated on a recording plane of the color camera by designing different included angles between the object light and the reference light and are recorded by the camera at the same time; the method comprises the following steps: performing fast Fourier transform on each color channel of a camera, separating the intensities of red, green and blue element holograms with different frequencies and angles in a frequency spectrum, extracting the intensity relationship of the red, green and blue element holograms in the frequency spectrum of each color channel to construct a crosstalk matrix, and eliminating channel crosstalk through matrix operation.

Description

Technical Field

[0001] The present invention relates to a camera channel crosstalk elimination device and method based on a color primitive hologram, and belongs to the technical field of color digital holography. Background Art

[0002] In recent years, with the development of modern manufacturing and material technologies, more and more new materials have been widely used in fields such as aerospace, construction, and medicine. The deformation measurement technology of materials under load conditions has become one of the hot issues widely studied at home and abroad. Among them, optical measurement technology has great prospects in the field of three-dimensional deformation measurement due to its advantages of non-destructive and full-field measurement. At present, deformation measurement methods such as digital image correlation method, speckle interferometry, fringe projection profilometry, and digital holography have achieved remarkable success.

[0003] A camera is a necessary device for optical imaging and optical detection. Especially, a color camera is an indispensable device in multi-wavelength optical imaging and optical detection. However, the channel crosstalk problem of color cameras has become one of the important reasons affecting the quality of optical imaging and the accuracy of optical detection.

[0004] Existing methods for eliminating channel crosstalk of color cameras include hardware-based methods such as adding filter films and changing the camera structure. These methods will bring additional costs. The deep learning method can effectively eliminate the channel crosstalk of color cameras, but the process of training the model is very time-consuming, and there are still generalization problems for different detection targets. In addition, the method of fitting the crosstalk matrix based on the intensity relationship in the spatial domain can also eliminate the channel crosstalk of color cameras, but there are problems of complex process and insufficient accuracy.

[0005] Extracting the intensity relationship in the frequency spectrum based on the interference fringes generated by equal inclination or equal thickness interference and fitting the crosstalk matrix is a fast, in-situ, and high-precision method. However, the frequency of the interference fringes generated by the above methods is low, the adjustable range is small, and different angles cannot be changed for lights of different colors. Summary of the Invention

[0006] Aiming at the above-mentioned disadvantages of the existing technologies, the present invention provides a camera channel crosstalk elimination device and method based on a color primitive hologram. By using the characteristics that the frequency of the primitive hologram generated by holographic interference is high and the angle can be freely adjusted, combined with the fast Fourier transform, the intensities of the primitive holograms of different wavelengths are extracted from the frequency spectrum. Through the intensity relationship of different wavelengths in the frequency spectrum, the crosstalk matrix is fitted to achieve the elimination of camera channel crosstalk. The present invention makes full use of the characteristics that the frequency and the adjustable range of the angle of the interference fringes generated by color digital holographic interference are large, can effectively make up for the deficiencies of the existing methods, and can be applied to the color digital holographic three-dimensional detection system.

[0007] The technical solution of the present invention is: a camera channel crosstalk elimination device based on a color primitive hologram, comprising: a laser, a beam splitting prism, a reflecting mirror, an expanding lens, a Fourier lens, a color camera 22 to eliminate crosstalk, and a blue-pass and green-reflecting dichroic mirror 23;

[0008] The laser comprises: a blue laser 1, a green laser 2, and a red laser 3;

[0009] The beam splitting prism comprises: a beam splitting prism I 4, a beam splitting prism II 5, a beam splitting prism III 6, a beam splitting prism IV 7, and a beam splitting prism V 8;

[0010] The reflecting mirror comprises: a reflecting mirror I 9, a reflecting mirror II 10, a reflecting mirror III 11, a reflecting mirror IV 12, and a reflecting mirror V 13;

[0011] The expanding lens comprises: an expanding lens I 14, an expanding lens II 15, an expanding lens III 16, and an expanding lens IV 17;

[0012] The Fourier lens comprises: a Fourier lens I 18, a Fourier lens II 19, a Fourier lens III 20, and a Fourier lens IV 21;

[0013] The blue laser 1, the green laser 2, and the red laser 3 emit laser sources, which are respectively split into six beams of laser by the beam splitting prism I 4, the beam splitting prism II 5, and the beam splitting prism III 6;

[0014] Among them, the first beam of blue laser is reflected by the reflecting mirror I 9, passes through the blue-pass and green-reflecting dichroic mirror 23 and combines with the first beam of green laser into one beam of light, and then combines with the red light into white light in the beam splitting prism IV 7, and successively becomes a parallel beam of light after passing through the expanding lens I 14 and the Fourier lens I 18, and is reflected by the reflecting mirror II 10 to the beam splitting prism V 8. This parallel light is reflected by the beam splitting prism V 8 and reaches the recording plane of the color camera 22 to eliminate crosstalk. This beam of white light is regarded as a reference beam, which contains a blue reference light, a green reference light, and a red reference light;

[0015] The second beam of blue light successively becomes a parallel beam of light after passing through the expanding lens II 15 and the Fourier lens II 19, is reflected by the reflecting mirror III 11, and then passes through the beam splitting prism V 8 to reach the recording plane of the color camera 22 to eliminate crosstalk. This beam of light is called the blue object light;

[0016] The second beam of green light successively becomes a parallel beam of light after passing through the expanding lens III 16 and the Fourier lens III 20, is reflected by the reflecting mirror IV 12, and then passes through the beam splitting prism V 8 to reach the recording plane of the color camera 22 to eliminate crosstalk. This beam of light is called the green object light;

[0017] After the second red light beam is reflected by the mirror V13, it passes through the beam expander IV17 and the Fourier lens IV21 in sequence and then becomes a parallel light beam, which passes through the beam splitting prism V8 and reaches the recording plane of the color camera 22 to be free of crosstalk. This light beam is called the red object light beam;

[0018] The object light beam and the reference light beam of the corresponding wavelength interfere on the beam splitting prism V8 to generate interference fringes. Since both the object light beam and the reference light beam are plane waves, the generated interference fringes are called elementary holograms, and the elementary holograms received and recorded by the color camera 22 to be free of crosstalk are called color elementary holograms; the color elementary holograms recorded by the color camera 22 to be free of crosstalk are saved in a computer for subsequent processing.

[0019] Furthermore, the wavelengths of the red laser 3, the green laser 2, and the blue laser 1 are 632.8 nm, 532 nm, and 453 nm respectively;

[0020] The beam expander includes a microscope objective and a small hole, and is used to expand a point light source into a light spot;

[0021] The Fourier lens is used to modulate the light wave expanded by the beam expander into a plane wave;

[0022] The beam splitting prism is a depolarization-free beam splitting prism; the beam splitting ratios of the beam splitting prism are all 1:1.

[0023] Furthermore, the blue reference light beam, the green reference light beam, and the red reference light beam of the holographic interference are combined into one light beam by the blue-pass and green-reflecting dichroic mirror 23 and the beam splitting prism IV7; during the interference, the included angles of the three reference light beams with the beam splitting prism V8 are the same; by adjusting the included angles of the red object light beam, the green object light beam, and the blue object light beam with the beam splitting prism V8 respectively, elementary holograms with different frequencies can be generated.

[0024] The present invention also provides a method for eliminating crosstalk in camera channels based on color elementary holograms, and the method includes:

[0025] S1. Turn on the red laser 3, the green laser 2, and the blue laser 1 to ensure that the color camera 22 to be free of crosstalk can receive color elementary holograms;

[0026] S2. Adjust the mirrors respectively, and design different included angles of three pairs of object light beams and reference light beams so that the frequencies and angles of the interference fringes generated by the red, green, and blue elementary holograms on the recording plane of the color camera 22 to be free of crosstalk are different;

[0027] S3. After the fringes of the elementary hologram are stable, use the color camera 22 to be free of crosstalk to record the elementary holograms of three colors simultaneously, which are called color elementary holograms;

[0028] S4. Use a computer to process the color elementary holograms and perform fast Fourier transform on the three color channels;

[0029] S5. After obtaining the Fourier spectrum, extract the intensities of the positive frequencies of the three color primitive holograms from the Fourier spectra of the three color channels respectively;

[0030] S6. Construct the extracted intensities into a crosstalk matrix, and perform column normalization and simplification on the crosstalk matrix;

[0031] S7. Eliminate the crosstalk of the crosstalk image recorded by the color camera 22 with crosstalk to be eliminated through the simplified crosstalk matrix by matrix inverse operation.

[0032] Furthermore, in the said S4, it includes:

[0033] (1). The channel crosstalk is expressed as:

[0034]

[0035] where I represents the ideal hologram intensity, I′ represents the intensity actually recorded by the camera, and C mn (m,n = R,G,B) represents the crosstalk coefficient between different color channels;

[0036] The primitive hologram generated by the interference of the object light and the reference light at each wavelength is expressed as:

[0037] I n = a n + b n cos[φ n , n = R,G,B

[0038] where R, G, and B respectively represent the red, green, and blue color channels, a represents the background intensity of the stripe, b represents the modulation intensity of the stripe, n represents different colors, and φ represents the phase of the hologram;

[0039] (2). Simultaneously record the color primitive holograms containing three wavelength components through the color camera 22 with crosstalk to be eliminated; the intensity recorded by each channel is the result of the overlapping response of the color camera 22 with crosstalk to be eliminated to the lasers of R, G, and B wavelengths, and is simplified to:

[0040]

[0041] (3). Perform a fast Fourier transform on each channel, and the Fourier spectrum F(I m ) is expressed as:

[0042]

[0043] where (u,v) represents the frequency domain coordinates, f represents the carrier frequency of the stripe; i is the unit of the imaginary number, and δ(u,v) is the Dirac function of the two-dimensional frequency domain coordinates (u,v).

[0044] Further, the S5 includes:

[0045] By designing the angles of the object light and the reference light, the intensities of the red, green, and blue primitive holograms are separated in the Fourier spectrum.

[0046] Further, the S6 includes:

[0047] Process the Fourier spectrum to obtain the crosstalk matrix; the processing process includes two steps: (1) Extract the modulus intensity of each color and form the crosstalk matrix with the modulus intensities; (2) Normalize the diagonal elements of the modulus intensity matrix.

[0048] Further, the crosstalk matrix is:

[0049]

[0050] The beneficial effects of the present invention are:

[0051] 1. The present invention applies color digital holography technology to crosstalk cancellation of color cameras. Using object light modulated as a plane wave to interfere with reference light to generate color primitive holograms, it can effectively fit the crosstalk matrix of color cameras, and the calibration error of the crosstalk coefficients in the crosstalk matrix is low;

[0052] 2. The present invention uses the principle of holographic interference. Since its interference fringe frequency is relatively high and the frequency points in the spectrum are farther from the central zero order, its anti-noise interference ability is stronger, ensuring the accuracy of fitting the crosstalk matrix;

[0053] 3. The uniform interference fringes of the present invention are generated by holographic interference, and its adjustable frequency range is relatively large. Therefore, the angles between the object light and the reference light of the primitive holograms do not need to be strictly designed, and it is easy to separate the interference fringes of different colors in the spectrum, and the actual application process is relatively simple;

[0054] 4. The device of the present invention does not require additional hardware, does not need to disassemble and assemble the color camera, and can achieve channel crosstalk cancellation through one shooting. It is a low-cost and fast channel crosstalk cancellation method.

[0055] 5. The present invention makes full use of the characteristics that the frequency and angle adjustable ranges of the interference fringes generated by color digital holographic interference are relatively large, can effectively make up for the deficiencies of existing methods, and can be applied to color digital holographic three-dimensional detection systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a schematic structural diagram of a camera channel crosstalk cancellation device based on color primitive holograms provided by an embodiment of the present invention;

[0057] Figure 2Schematic flow diagram of the crosstalk cancellation method according to an embodiment of the present invention;

[0058] Figure 3 Element holograms at different angles and the spectrum of the color element hologram recorded by the color camera;

[0059] Figure 4 Schematic diagram of the displacement generator used in the simulation;

[0060] Figure 5 Holographic reconstructed image with channel crosstalk recorded in the simulation;

[0061] Figure 6 Holographic reconstructed image after crosstalk cancellation by the present invention in the simulation;

[0062] Figure 7 Phase difference images of three color channels with channel crosstalk recorded in the simulation;

[0063] Figure 8 Phase difference images of three color channels after crosstalk cancellation in the simulation;

[0064] Figure 1 Labels in the figure: 1 - blue laser, 2 - green laser, 3 - red laser, 4 - beam splitter prism I, 5 - beam splitter prism II, 6 - beam splitter prism III, 7 - beam splitter prism IV, 8 - beam splitter prism V, 9 - mirror I, 10 - mirror II, 11 - mirror III, 12 - mirror IV, 13 - mirror V, 14 - beam expander I, 15 - beam expander II, 16 - beam expander III, 17 - beam expander IV, 18 - Fourier lens I, 19 - Fourier lens II, 20 - Fourier lens III, 21 - Fourier lens IV, 22 - color camera to eliminate crosstalk, 23 - dichroic mirror that passes blue and reflects green. Specific implementation mode

[0065] Embodiment 1: As shown in Figures 1-8 the figure, a device for eliminating camera channel crosstalk based on a color element hologram includes: a laser, a beam splitter prism, a mirror, a beam expander, a Fourier lens, a color camera 22 to eliminate crosstalk, and a dichroic mirror 23 that passes blue and reflects green;

[0066] The laser includes: a blue laser 1, a green laser 2, and a red laser 3;

[0067] The beam splitter prism includes: a beam splitter prism I 4, a beam splitter prism II 5, a beam splitter prism III 6, a beam splitter prism IV 7, and a beam splitter prism V 8;

[0068] The mirror includes: a mirror I 9, a mirror II 10, a mirror III 11, a mirror IV 12, and a mirror V 13;

[0069] The beam expander includes: beam expander I 14, beam expander II 15, beam expander III 16, and beam expander IV 17;

[0070] The Fourier lens includes: Fourier lens I 18, Fourier lens II 19, Fourier lens III 20, and Fourier lens IV 21;

[0071] The blue laser 1, green laser 2, and red laser 3 emit laser sources, which are respectively divided into six beams of laser by beam splitter prism I 4, beam splitter prism II 5, and beam splitter prism III 6;

[0072] Among them, the first beam of blue laser is reflected by mirror I 9, passes through the blue-transmitting and green-reflecting dichroic mirror 23 and combines with the first beam of green laser into one beam of light. Then, it combines with the red light in beam splitter prism IV 7 to form white light. After passing through beam expander I 14 and Fourier lens I 18 in sequence, it becomes a parallel beam of light, which is reflected by mirror II 10 to beam splitter prism V 8. The parallel light is reflected by beam splitter prism V 8 and reaches the recording plane of the color camera 22 to be free of crosstalk. This beam of white light is regarded as the reference beam, which contains blue reference light, green reference light, and red reference light;

[0073] The second beam of blue light becomes a parallel beam of light after passing through beam expander II 15 and Fourier lens II 19 in sequence. After being reflected by mirror III 11, it passes through beam splitter prism V 8 and reaches the recording plane of the color camera 22 to be free of crosstalk. This beam of light is called the blue object light;

[0074] The second beam of green light becomes a parallel beam of light after passing through beam expander III 16 and Fourier lens III 20 in sequence. After being reflected by mirror IV 12, it passes through beam splitter prism V 8 and reaches the recording plane of the color camera 22 to be free of crosstalk. This beam of light is called the green object light;

[0075] The second beam of red light is reflected by mirror V 13, becomes a parallel beam of light after passing through beam expander IV 17 and Fourier lens IV 21 in sequence, and passes through beam splitter prism V 8 to reach the recording plane of the color camera 22 to be free of crosstalk. This beam of light is called the red object light;

[0076] The object light beams and reference beams corresponding to different colors and wavelengths interfere on beam splitter prism V 8 to produce interference fringes. Since both the object light beam and the reference light beam are plane waves, the interference fringes produced are called elementary holograms, which are received and recorded by the color camera 22 to be free of crosstalk and are called color elementary holograms; The color elementary holograms recorded by the color camera 22 to be free of crosstalk are saved on the computer, and the computer completes the subsequent crosstalk matrix fitting.

[0077] The computer is used to store and process the color elementary holograms, including fast Fourier transform, extracting the intensity in the spectrum, and fitting the crosstalk matrix.

[0078] Further, the wavelengths of the red laser 3, green laser 2, and blue laser 1 are 632.8 nm, 532 nm, and 453 nm, respectively;

[0079] The beam expander includes a microscope objective and a small hole, and is used to expand a point light source into a light spot;

[0080] The Fourier lens is used to modulate the light wave expanded by the beam expander into a plane wave;

[0081] The beam splitting prism is a depolarization beam splitting prism; the beam splitting ratios of the beam splitting prism are all 1:1.

[0082] Further, the blue reference light, green reference light, and red reference light of the holographic interference are combined into one beam of light by the blue-pass and green-reflecting dichroic mirror 23 and the beam splitting prism IV 7; during interference, the angles between the three reference lights and the beam splitting prism V 8 are the same; by adjusting the angles between the red object light, green object light, and blue object light and the beam splitting prism V 8 respectively, elementary holograms with different frequencies can be generated. The elementary hologram does not contain information about the object to be measured. Therefore, it is single-frequency, and the frequency and direction are only determined by the wavelength and the angle between the object light and the reference light.

[0083] The present invention also provides a method for eliminating crosstalk in camera channels based on a color elementary hologram, and the method includes:

[0084] S1. Turn on the red laser 3, green laser 2, and blue laser 1 to ensure that the color camera 22 to eliminate crosstalk can receive the color elementary hologram;

[0085] S2. Adjust the mirrors respectively to design three different pairs of angles between the object beam and the reference beam, so that the frequencies and angles of the interference fringes generated by the red, green, and blue elementary holograms on the recording plane of the color camera 22 to eliminate crosstalk are different;

[0086] S3. After the elementary hologram fringes are stable, use the color camera 22 to eliminate crosstalk to record the elementary holograms of the three colors simultaneously, which are called color elementary holograms;

[0087] S4. Use a computer to process the color elementary hologram and perform a fast Fourier transform on the three color channels;

[0088] S5. After obtaining the Fourier spectrum, extract the intensities of the positive frequencies of the three color elementary holograms from the Fourier spectra of the three color channels respectively;

[0089] S6. Construct the extracted intensities into a crosstalk matrix, and perform column normalization and simplification on the crosstalk matrix;

[0090] S7. Eliminate the crosstalk of the crosstalk image recorded by the color camera 22 to eliminate crosstalk through matrix inverse operation using the simplified crosstalk matrix.

[0091] Furthermore, in S4, it includes:

[0092] (1), The channel crosstalk is expressed as:

[0093]

[0094] where I represents the ideal hologram intensity, I′ represents the intensity actually recorded by the camera, and C mn (m,n = R,G,B) represents the crosstalk coefficient between different color channels;

[0095] The elementary hologram generated by the interference of the object light and the reference light of each wavelength is expressed as:

[0096] I n = a n + b n cos[φ n , n = R,G,B

[0097] where R, G, and B respectively represent the red, green, and blue color channels, a represents the background intensity of the fringe, b represents the modulation intensity of the fringe, n represents different colors, and φ represents the phase of the hologram;

[0098] (2), The color elementary hologram containing three wavelength components is simultaneously recorded by the color camera 22 with crosstalk to be eliminated; the intensity recorded by each channel is the result of the overlapping response of the color camera 22 with crosstalk to be eliminated to the R, G, and B wavelength lasers, and is simplified to:

[0099]

[0100] (3), Perform a fast Fourier transform on each channel, and the Fourier spectrum F(I m ) is expressed as:

[0101]

[0102] where (u,v) represents the frequency domain coordinates, f represents the carrier frequency of the fringe; i is the unit of the imaginary number, and δ(u,v) is the Dirac function of the two-dimensional frequency domain coordinates (u,v).

[0103] Furthermore, S5 includes:

[0104] Separate the intensities of the red, green, and blue elementary holograms in the Fourier spectrum by designing the angles of the object light and the reference light.

[0105] Furthermore, S6 includes:

[0106] Process the Fourier spectrum to obtain the crosstalk matrix; the processing process includes two steps: (1) Extract the modulus intensity of each color, and form the crosstalk matrix with the modulus intensity; (2) Normalize the diagonal elements of the modulus intensity matrix.

[0107] Furthermore, the crosstalk matrix is:

[0108] (1), Extract the modulus intensity of each color in each color channel, and construct the crosstalk matrix V:

[0109]

[0110] (2), Normalize the columns of the above crosstalk matrix V to obtain the following crosstalk matrix:

[0111]

[0112] (3), Since the wavelengths corresponding to the R, G, and B channels themselves do not cause crosstalk, C RR 、C GG 、C BB is set to 1, simplify the crosstalk matrix, and finally the crosstalk matrix is simplified to:

[0113]

[0114] The light intensity of the color primitive hologram recorded by the present invention is relatively large. Therefore, the obtained crosstalk matrix is less affected by the random noise generated by the environment and the camera itself, and is not affected by the decrease in the fringe contrast of the primitive hologram caused by the change in the ratio of the object light intensity to the reference light intensity.

[0115] The method of the present invention solves the crosstalk matrix of the color camera through interference fringes of different frequencies. The primitive hologram generated by the holographic interference method has a large spectral and angular modulation range of the fringes, and the crosstalk coefficient results in the crosstalk matrix are not easily affected by the central zero order of the spectrum.

[0116] The uniform interference fringes are generated by holographic interference, and their frequency adjustable range is large. Therefore, the included angle between the object light and the reference light of the primitive hologram does not need to be strictly designed, and it is sufficient to separate the interference fringes of different colors in the spectrum.

[0117] In order to verify the effect of the present invention, a verification experiment was conducted. Figure 4 is a schematic diagram of a simulated disk-shaped displacement generator; Figure 5 is the holographic reconstructed image with channel crosstalk recorded by simulation, Figure 6 is the holographic reconstructed image after eliminating crosstalk through the present invention, indicating that the present invention has a good effect of eliminating crosstalk. Figure 4 is a circle, so the reconstructed image should be a circle. Figure 5Due to the influence of channel crosstalk, the reconstructed image appears ghosted and is no longer circular. The deformation of the displacement generator will generate a phase difference, which should be a very standard concentric circle structure. Figure 7 It is the phase difference of the red channel, green channel, and blue channel with crosstalk generated by simulating the deformation of the displacement generator, and the concentric circle structure is damaged. Figure 8 It is the phase difference of the red channel, green channel, and blue channel with crosstalk eliminated, and the concentric circle structure is restored, indicating that the present invention can effectively eliminate the phase difference error caused by camera channel crosstalk in color digital holographic deformation detection.

[0118] The specific embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge scope of those of ordinary skill in the art.

Claims

1. A camera channel crosstalk elimination device based on color primitive hologram, characterized in that: include: Laser, beam splitter, reflector, beam expander, Fourier lens, color camera (22) to be crosstalk eliminated, blue-transmitting and green-reflecting dichroic mirror (23); The lasers include: a blue laser (1), a green laser (2), and a red laser (3); The beam splitter prism comprises: a beam splitter prism I (4), a beam splitter prism II (5), a beam splitter prism III (6), a beam splitter prism IV (7), and a beam splitter prism V (8); The reflectors include: reflector I (9), reflector II (10), reflector III (11), reflector IV (12), and reflector V (13); The beam expander comprises: a beam expander I (14), a beam expander II (15), a beam expander III (16), and a beam expander IV (17); The Fourier lens comprises: Fourier lens I (18), Fourier lens II (19), Fourier lens III (20), and Fourier lens IV (21); The blue laser (1), the green laser (2), and the red laser (3) emit laser sources, which are respectively divided into six laser beams by the beam splitter prism I4, the beam splitter prism II (5), and the beam splitter prism III (6); The first blue laser beam is reflected by the reflector I (9), passes through the blue-transmitting and green-reflecting dichroic mirror (23), and is combined with the first green laser beam into a beam of light. Then, it is combined with the red light into white light in the beam splitter prism IV (7), and then passes through the beam expander I (14) and the Fourier lens I (18) in sequence to become a parallel beam, which is reflected by the reflector II (10) to the beam splitter prism V (8). After being reflected by the beam splitter prism V (8), the parallel light reaches the recording plane of the color camera (22) to be crosstalk eliminated. This white light is used as a reference beam, which includes a blue reference light, a green reference light, and a red reference light. The second blue light beam passes through beam expander II (15) and Fourier lens II (19) in sequence to become parallel light, and after being reflected by reflector III (11), it passes through beam splitter prism V (8) to reach the recording plane of the color camera (22) to be crosstalk eliminated. This light beam is called blue object light; The second green light beam passes through the beam expander III (16) and the Fourier lens III (20) in sequence and becomes parallel light. After being reflected by the reflector IV (12), it passes through the beam splitter prism V (8) and reaches the recording plane of the color camera (22) to be crosstalk eliminated. This light beam is called green object light. The second red light beam is reflected by the reflector V (13), passes through the beam expander IV (17) and the Fourier lens IV (21) in sequence, becomes parallel light, and passes through the beam splitter prism V (8) to reach the recording plane of the color camera (22) to be crosstalk eliminated. This light beam is called red object light. The object beam and the reference beam of corresponding wavelengths interfere with each other on the beam splitter prism V (8) to generate interference fringes. Since both the object beam and the reference beam are plane waves, the generated interference fringes are called elementary holograms, which are received and recorded by the color camera (22) to eliminate crosstalk and are called color elementary holograms. The color elementary holograms recorded by the color camera (22) to eliminate crosstalk are stored in a computer for subsequent processing.

2. The camera channel crosstalk elimination device based on color primitive hologram according to claim 1, characterized in that: The wavelengths of the red laser (3), green laser (2) and blue laser (1) are 632.8 nm, 532 nm and 453 nm respectively; The beam expander includes a microscope objective lens and a pinhole, and is used to expand a point light source into a light spot; The Fourier lens is used to modulate the light wave expanded by the beam expander into a plane wave; The beam splitter prism is a depolarizing beam splitter prism; the beam splitting ratio of the beam splitter prism is 1:

1.

3. The camera channel crosstalk elimination device based on color primitive hologram according to claim 1, characterized in that: The blue light reference light, green light reference light and red light reference light of the holographic interference are combined into one light beam by a blue-transmitting and green-reflecting dichroic mirror (23) and a beam splitter prism IV (7); during interference, the angles between the three reference light beams and the beam splitter prism V (8) are consistent; by adjusting the angles between the red light object light, the green light object light and the blue light object light and the beam splitter prism V (8), elementary holograms of different frequencies can be generated.

4. A camera channel crosstalk elimination method based on color primitive hologram, characterized in that: The method comprises: S1, turning on the red laser (3), the green laser (2), and the blue laser (1) to ensure that the color camera (22) to be crosstalk eliminated can receive the color elementary hologram; S2, respectively adjusting the reflectors and designing different angles between the three pairs of object beams and the reference beams so that the frequencies and angles of the interference fringes generated by the red, green and blue elementary holograms on the recording plane of the color camera (22) to be crosstalk eliminated are different; S3, after the elementary hologram fringes are stabilized, the elementary holograms of three colors are simultaneously recorded using a color camera (22) to be crosstalk eliminated, which is called a color elementary hologram; S4, using a computer to process the color primitive hologram and perform fast Fourier transform on the three color channels; S5. After the Fourier spectrum is obtained, the intensity of the positive frequencies of the three color primitive holograms is respectively extracted from the Fourier spectrum spectra of the three color channels; S6, constructing the extracted intensities into a crosstalk matrix, and performing column normalization and simplification on the crosstalk matrix; S7, eliminating crosstalk from the crosstalk image recorded by the color camera (22) to be crosstalk eliminated by matrix inverse operation using the simplified crosstalk matrix.

5. The camera channel crosstalk elimination method based on color primitive hologram according to claim 4, characterized in that: The S4 includes: (1) Channel crosstalk is expressed as: Where I represents the ideal hologram intensity, I′ represents the intensity actually recorded by the camera, and C mn (m,n=R,G,B) represents the crosstalk coefficient between different color channels; The elementary hologram produced by the interference of object light and reference light of each wavelength is expressed as: I n =a n +b n cos[φ n ],n=R,G,B Among them, R, G, B represent the red, green, and blue color channels respectively, a represents the background intensity of the stripes, b represents the modulation intensity of the stripes, n represents the different colors, and φ represents the phase of the hologram; (2) The color elementary hologram containing three wavelength components is simultaneously recorded by the color camera (22) to be crosstalk eliminated; the intensity recorded in each channel is the result of the overlapping response of the color camera (22) to the R, G, and B wavelength lasers to be crosstalk eliminated, which is simplified as: (3) Perform fast Fourier transform on each channel, and the Fourier spectrum F(I m ) is expressed as: Among them, (u, v) represents the frequency domain coordinates, f represents the carrier frequency of the fringes; i is the unit of imaginary number, and δ(u, v) is the Dirac function of the two-dimensional frequency domain coordinates (u, v).

6. The camera channel crosstalk elimination method based on color primitive hologram according to claim 4, characterized in that: The S5 includes: By designing the angles of the object light and the reference light, the intensities of the red, green and blue elementary holograms are separated in the Fourier spectrum.

7. The camera channel crosstalk elimination method based on color primitive hologram according to claim 4, characterized in that: The S6 includes: The Fourier spectrum is processed to obtain a crosstalk matrix. The processing includes two steps: (1) extracting the modulus intensity of each color and forming a crosstalk matrix from the modulus intensity; and (2) normalizing the diagonal elements of the modulus intensity matrix.

8. The camera channel crosstalk elimination method based on color primitive hologram according to claim 4, characterized in that: The crosstalk matrix is:

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