CN113567396A - Scattering imaging system and method based on speckle field polarization common mode rejection - Google Patents
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Abstract
The invention discloses a scattering imaging system and a method based on speckle field polarization common mode rejection, wherein the system comprises: the device comprises a light source, a first module, a second module and a third module; the system utilizes the polarization common mode rejection characteristic to realize the imaging of the transmission random scattering medium under the illumination of a wide-spectrum light source, effectively removes the background noise influence caused by the spectrum width of the light source, and can greatly improve the signal-to-noise ratio, the contrast and the structural similarity of the reconstructed image. In addition, the scattering imaging system based on speckle field polarization common mode rejection can realize transmission scattering medium imaging by using a wide-spectrum illumination light source such as a white light LED or natural light which is low in manufacturing cost and easy to obtain, improves the universality of a scattering imaging technology, and has important application value and prospect.
Description
Technical Field
The invention belongs to the technical field of scattered medium imaging, and particularly relates to a scattered imaging system and method based on speckle field polarization common mode rejection.
Background
In the scattering medium imaging technology, due to the strong scattering effect of the random scattering medium on the light waves, the spatial relative relationship of the original incident light field is changed when the incident light waves are emitted from the surface of the scattering medium, and the emitted light field becomes disordered and random, so that target information is submerged in disordered background noise, and the target cannot be directly observed.
At present, the related art mainly recovers the target information from the speckle light field through the scattering property of the scattering medium or the random statistical property of the speckle field. However, when the target information is recovered by using the scattering property of the scattering medium, the measurement of the transmission matrix is limited by the coherence of the light waves, and the final imaging is the convolution of the transmission matrix and the target information. Therefore, when the transmission matrix measurement is not accurate enough, the signal-to-noise ratio of the recovered target information is also reduced, and the imaging quality is further reduced. In addition, when the target information is extracted by using the random statistical characteristic of the speckle field, the assumed condition of the similarity of the system Point Spread Function (PSF) is harsh, so that the wide-spectrum imaging through the random scattering medium cannot be realized.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a scattering imaging system and method based on speckle field polarization common mode rejection. The technical problem to be solved by the invention is realized by the following technical scheme:
in a first aspect, the present invention provides a scattering imaging system based on speckle field polarization common mode rejection, including: the device comprises a light source, a first module, a second module and a third module; wherein,
the first module is positioned at one side of the light source and used for modulating light rays emitted by the light source and generating linearly polarized light, and the first module comprises a diaphragm, a collimating lens and a first polarization modulator;
the second module is positioned on one side of the first module, which is far away from the light source, and is used for modulating the speckle image generated by the scattering medium, and the second module comprises an imaging target, the scattering medium and a second polarization modulator;
the third module is located on one side of the second module, which is far away from the first module, and is used for receiving and imaging the modulated speckle images, the speckle images contain information of the imaging target, and the third module comprises a detector and a computing unit.
In one embodiment of the invention, the spectral range of the light source is visible light.
In one embodiment of the invention, the first polarization modulator is located on a side of the diaphragm away from the light source, and the collimating lens is located between the diaphragm and the first polarization modulator;
the light source, the diaphragm and the collimating lens are all located on the same optical axis.
In one embodiment of the invention, the imaging target is located on a side of the first module away from the light source, the scattering medium is located on a side of the imaging target away from the first module, and the second polarization modulator is located between the scattering medium and the third module.
In one embodiment of the invention, the detector is located between the second module and the calculation unit.
In one embodiment of the invention, the scattering medium is ground glass.
In a second aspect, the present invention further provides a scattering imaging method based on speckle field polarization common mode rejection, which is applied to a computing unit in the scattering imaging system based on speckle field polarization common mode rejection in any one of the above first aspects, and includes:
collecting speckle images of the second polarization modulator under the modulation of different polarization azimuth angles according to a preset interval angle;
determining an autocorrelation function for each of the speckle images;
determining a first speckle image corresponding to a maximum autocorrelation peak value and a second speckle image corresponding to a minimum autocorrelation peak value according to the autocorrelation function of the speckle images and the peak correlation energy evaluation index of the autocorrelation function, and calculating to obtain a speckle polarization differential image;
determining an autocorrelation function of the information of the imaging target according to the speckle polarization differential image;
and obtaining the Fourier amplitude of the imaging target according to the Venezlndication theory and the autocorrelation function of the information of the imaging target, and obtaining an imaged image through phase recovery.
In an embodiment of the present invention, the step of collecting the speckle images obtained by gating the second polarization modulator under different optical axis angles according to a preset interval angle includes:
acquiring a polarization azimuth angle of a first polarization modulator, and adjusting a polarization starting angle of a second polarization modulator to be the azimuth angle of the first polarization modulator;
acquiring speckle images of the second polarization modulator under different polarization azimuth angles according to a preset interval angle from the polarization starting angle;
wherein the preset interval angle is 5 °.
In one embodiment of the invention, the autocorrelation function for each of the speckle images is determined as follows:
wherein I represents the speckle field intensity, J1Representing a first order bezier function, D represents the speckle diameter,
the distance between the centers of the speckles at different positions in the speckles is represented, deltax represents the difference between the positions in the speckles and the abscissa of the center of the speckles, and deltay represents the positions in the speckles and the divergence of the positions in the specklesThe difference of ordinate values of the spot centers, λ represents the wavelength of the light wave, z represents the transmission distance of the light field, ΓIRepresenting the autocorrelation function of the speckle field.
In one embodiment of the invention, the autocorrelation function of the information of the imaged object is determined as follows:
where it denotes the autocorrelation operation, O denotes the light field of the imaged object, delta denotes the impulse function, and alphaiRepresenting the superposition coefficient, alpha, of the ith narrow-spectrum sub-light sourcejDenotes the superposition coefficient, λ, of the jth narrow-spectrum sub-light sourceiDenotes the ith narrow-spectrum sub-light source, Δ λiIndicating the spectral width of the ith narrow-spectrum sub-source.
The invention has the beneficial effects that:
the invention provides a scattering imaging system based on speckle field polarization common mode rejection, which comprises: the device comprises a light source, a first module, a second module and a third module; the system utilizes the polarization common mode rejection characteristic to realize the imaging of the transmission random scattering medium under the illumination of a wide-spectrum light source, effectively removes the background noise influence caused by the spectrum width of the light source, and can greatly improve the signal-to-noise ratio, the contrast and the structural similarity of the reconstructed image.
In addition, the scattering imaging system based on speckle field polarization common mode rejection can realize transmission scattering medium imaging by using a wide-spectrum illumination light source such as a white light LED or natural light which is low in manufacturing cost and easy to obtain, improves the universality of a scattering imaging technology, and has important application value and prospect.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
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FIG. 1 is a schematic structural diagram of a scattering imaging system based on speckle field polarization common mode rejection provided by an embodiment of the invention;
FIG. 2 is a schematic flow chart of a scattering imaging method based on speckle field polarization common mode rejection according to an embodiment of the present invention;
FIG. 3 is a diagram of an example of a speckle polarization differential image provided by an embodiment of the invention;
FIG. 4 is a diagram of an example of a scattering imaging result based on speckle field polarization common mode rejection provided by an embodiment of the invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Referring to fig. 1, an embodiment of the present invention provides a scattering imaging system based on speckle field polarization common mode rejection, including: the device comprises a light source, a first module, a second module and a third module; wherein,
the first module is positioned at one side of the light source and used for modulating light rays emitted by the light source and generating linearly polarized light, and the first module comprises a diaphragm, a collimating lens and a first polarization modulator;
the second module is positioned on one side of the first module, which is far away from the light source, and is used for modulating the speckle image generated by the scattering medium, and the second module comprises an imaging target, the scattering medium and a second polarization modulator;
the third module is located on one side, far away from the first module, of the second module and used for receiving and imaging the modulated speckle images, the speckle images contain information of an imaging target, and the third module comprises a detector and a computing unit.
In the scattering medium imaging technology, when the incident light waves are emitted from the surface of the scattering medium due to the strong scattering effect of the scattering medium on the light waves, the spatial relative relationship of the original incident light field changes, and the emitted light field becomes disordered and random, so that target information is submerged in disordered background noise, and the target cannot be observed directly. Since the information of the imaging target is hidden in the speckle light field formed by the scattered light, it is necessary to recover the information of the hidden imaging target from the speckle image.
In this embodiment, the scattering imaging system based on the polarization common mode rejection of the speckle field may selectively use an LED wide-spectrum light source, that is, the spectrum band of the light source is visible light. Specifically, the first module is located on one side of the light source, and after light emitted by the light source is received by the first module, the first module can modulate the light, so that unpolarized light is converted into linearly polarized light; then, the linearly polarized light reaches the second module, and due to the fact that the scattering medium is arranged in the second module, the linearly polarized light generates a speckle image after passing through the scattering medium, and then the third module extracts information of an imaging target according to the speckle image and images the information.
The calculating unit in the third module is a device capable of analyzing and calculating the speckle image and displaying the final imaging result, for example, the calculating unit may be a computer, which is not limited in this embodiment.
Optionally, in the first module, the first polarization modulator is located on a side of the diaphragm away from the light source, and the collimating lens is located between the diaphragm and the first polarization modulator; the light source, the diaphragm and the collimating lens are all located on the same optical axis.
Specifically, in this embodiment, the diaphragm is located on one side of the light source, the collimating lens is located on one side of the diaphragm away from the light source, and the first polarization modulator is located on one side of the collimating lens away from the diaphragm, so that after the light emitted by the light source reaches the diaphragm, the aperture of the diaphragm can limit the light. Further, in the present embodiment, the light source, the diaphragm and the collimating lens are all disposed on the same optical axis, so that parallel light can be obtained. It should be understood that the second module includes the imaging target, if the emergent of first module is non-parallel light, then non-parallel light shines the imaging target and will lead to the uneven condition of illumination to appear, and then makes the speckle position of follow-up production break away from the detector target surface, therefore this embodiment adopts the design that sets up light source, diaphragm and collimating lens in same optical axis, is favorable to reducing the risk that the speckle breaks away from the detector target surface, has guaranteed above-mentioned imaging system's reliability.
Optionally, in the second module, the imaging target is located on a side of the first module away from the light source, the scattering medium is located on a side of the imaging target away from the first module, and the second polarization modulator is located between the scattering medium and the third module;
in the third module, the detector is located between the second module and the calculation unit.
In the embodiment, the size of the imaging target is about 1.5mm, the scattering medium is made of 20grit ground glass, the ground glass is arranged on the side of the imaging target far away from the light source and is 60cm away from the imaging target, and the second polarization modulator is arranged on the side of the scattering medium far away from the light source. In the third module, the detector is located between the second polarization modulator and the computing unit, and the distance between the second detector and the scattering medium is about 12cm, so that the speckle formed by the scattering medium is ensured to be located at the center of the target surface of the detector.
Obviously, the scattering imaging system based on speckle field polarization common mode rejection realizes imaging of the transmission random scattering medium under the illumination of the wide-spectrum light source by utilizing the polarization common mode rejection characteristic, effectively removes the influence of background noise caused by the spectral width of the light source, and can greatly improve the signal-to-noise ratio, the contrast and the structural similarity of a reconstructed image. Compared with the scattering medium imaging technology in the related technology, the method can stably and efficiently reconstruct the outline and detail information of the imaging target from the wide-spectrum speckle light field. Moreover, the system can realize imaging through the scattering medium by using a wide-spectrum illumination light source which is low in manufacturing cost and easy to obtain such as a white light LED or natural light, improves the universality of the scattering imaging technology, and has important application value and prospect.
As shown in fig. 2, the present invention further provides a scattering imaging method based on speckle field polarization common mode rejection, which is applied to a computing unit in the scattering imaging system based on speckle field polarization common mode rejection, and the computing unit includes:
s21, collecting speckle images of the second polarization modulator under different polarization azimuth angles according to a preset interval angle;
s22, determining an autocorrelation function and an autocorrelation peak value of each speckle image;
s23, determining a first speckle image corresponding to the maximum autocorrelation peak value and a second speckle image corresponding to the minimum autocorrelation peak value according to the autocorrelation function of the speckle images and the peak correlation energy evaluation index of the autocorrelation function, and calculating to obtain a speckle polarization differential image;
s24, determining the autocorrelation function of the information of the imaging target according to the speckle polarization differential image;
and S25, obtaining the Fourier amplitude of the imaging target according to the Winnozhini theorem and the autocorrelation function of the information of the imaging target, and obtaining an imaged image through phase recovery.
The scattering imaging method based on speckle field polarization common mode rejection realizes imaging of the transmission random scattering medium under illumination of a wide-spectrum light source by utilizing the polarization common mode rejection characteristic, and can effectively remove the influence of background noise caused by the spectral width of the light source, thereby greatly improving the signal-to-noise ratio, the contrast and the structural similarity of a reconstructed image and ensuring the imaging reliability.
Optionally, in step S21, the step of acquiring speckle images obtained by gating the second polarization modulator at different optical axis angles according to a preset interval angle includes:
acquiring a polarization azimuth angle of the first polarization modulator, and adjusting a polarization initial angle of the second polarization modulator to be the azimuth angle of the first polarization modulator;
acquiring speckle images of the second polarization modulator under different polarization azimuth angles according to a preset interval angle from a polarization starting angle;
wherein the preset interval angle is 5 degrees.
The present embodiment acquires a plurality of speckle images by adjusting the polarization azimuth angle of the second polarization modulator. Specifically, the polarization azimuth angle of the first polarization modulator is used as the polarization starting angle of the second polarization modulator, that is, the optical axis direction of the second polarization modulator is adjusted to be parallel to the optical axis direction of the first polarization modulator, and the speckle image at the moment is collected; then, the second polarization modulator is rotated, and one speckle image is acquired at intervals of 5 degrees until the second polarization modulation device is rotated by 360 degrees, so that the speckle images of the second polarization modulator under different polarization azimuth angles are obtained.
Further, in the above step S22, the autocorrelation function of each speckle image is determined according to the formula:
wherein I represents the speckle field intensity, J1Representing a first order bezier function, D represents the speckle diameter,
the distance between the centers of the speckles at different positions in the speckles is represented, Deltax represents the difference between the abscissa of the centers of the speckles and the positions in the speckles, Delay represents the value difference between the ordinate of the centers of the speckles and the positions in the speckles, Lambda represents the wavelength of the light wave, z represents the transmission distance of the light field, and Gamma is representedIRepresenting the autocorrelation function of the speckle field. It should be noted that the coordinate system and the speckles are located in the same plane.
Then, according to a peak-to-correlation energy evaluation index (PCE) of the autocorrelation function, the sum of the peak point of each speckle image autocorrelation function and 8 corresponding data around the autocorrelation function close to the peak is compared to characterize the intensity of the information of the imaging target. Specifically, calculating the ratio of a peak point to the sum of 8 data close to the peak around the peak point, and finding out a speckle image corresponding to the maximum value and the minimum value of the PCE; obviously, the first speckle image with the largest PCE represents the largest difference between the information of the imaging target and the background noise, and the second speckle image with the smallest PCE represents the smallest difference between the information of the imaging target and the background noise.
Optionally, after the first speckle image and the second speckle image are determined, extracting information of an imaging target according to a polarization common mode rejection characteristic method shown in the following formula, and rejecting background noise to obtain a speckle polarization differential image with high contrast:
wherein, ImaxRepresenting a first speckle image, IminRepresenting a second speckle image, PDI representing a polarized differential imaging signal, and PSI representing a polarized sum imaging signal. It should be noted that PSI may represent the scene intensity image, and PDI represents the result of suppressing the background noise with non-biased property in the scene intensity image.
Alternatively, in the above step S24, the autocorrelation function of the information of the imaging target is determined according to the following formula:
where it denotes the autocorrelation operation, O denotes the light field of the imaged object, delta denotes the impulse function, and alphaiRepresenting the superposition coefficient, alpha, of the ith narrow-spectrum sub-light sourcejDenotes the superposition coefficient, λ, of the jth narrow-spectrum sub-light sourceiDenotes the ith narrow-spectrum sub-light source, Δ λiIndicating the spectral width of the ith narrow-spectrum sub-source. It should be noted that the sum of all narrow-spectrum sub-light sources is the wide-spectrum light source.
Further, according to the Venezlnchan theorem and the autocorrelation function of the information of the imaging target, the Fourier amplitude of the imaging target is obtained, then the Fourier phase of the imaging target is obtained by using a phase recovery algorithm, and the imaging target can be reconstructed through inverse Fourier transform to obtain an imaging result.
Optionally, the fourier magnitude is determined according to the following equation:
F-1{|F{O(x,y)}|2}＝O(x,y)☆O(x,y)
where F { O (x, y) } represents the fourier amplitude of the imaged object, it represents the autocorrelation operation, O represents the lightfield of the imaged object, δ represents the impulse function, x represents the abscissa and y represents the ordinate of the ordinate.
Fig. 3 is a diagram illustrating an example of a speckle polarization differential image provided by an embodiment of the present invention, and fig. 4 is a diagram illustrating an example of a speckle field polarization common mode rejection-based scatter imaging result provided by an embodiment of the present invention. As shown in fig. 3, in the speckle polarization differential image, the information of the imaging target is highlighted, and the background noise is suppressed; after the speckle polarization differential image is obtained, an autocorrelation function of the information of the imaging target is determined, and the imaging target is restored by using the xincizu theorem, as can be seen from fig. 4, the imaging target is a digital "2". Obviously, the scattering imaging method based on speckle field polarization common mode rejection realizes imaging of the transmitted random scattering medium under the illumination of a wide-spectrum light source, effectively removes the influence of background noise caused by the spectral width of the light source, and greatly improves the signal-to-noise ratio, the contrast and the structural similarity of a reconstructed image. Meanwhile, the method can realize imaging through the scattering medium by using a wide-spectrum illumination light source which is low in manufacturing cost and easy to obtain such as a white light LED or natural light, improves the universality of the scattering imaging technology, and has important application value and prospect.
An embodiment of the present invention further provides an electronic device, as shown in fig. 5, which includes a processor 501, a communication interface 502, a memory 503 and a communication bus 504, where the processor 501, the communication interface 502 and the memory 503 complete mutual communication through the communication bus 504,
a memory 503 for storing a computer program;
the processor 501, when executing the program stored in the memory 503, implements the following steps:
collecting speckle images of the second polarization modulator under the modulation of different polarization azimuth angles according to a preset interval angle;
determining an autocorrelation function for each of the speckle images;
determining a first speckle image corresponding to a maximum autocorrelation peak value and a second speckle image corresponding to a minimum autocorrelation peak value according to the autocorrelation function of the speckle images and the peak correlation energy evaluation index of the autocorrelation function, and calculating to obtain a speckle polarization differential image;
determining an autocorrelation function of the information of the imaging target according to the speckle polarization differential image;
and obtaining the Fourier amplitude of the imaging target according to the Venezlndication theory and the autocorrelation function of the information of the imaging target, and obtaining an imaged image through phase recovery.
The communication bus mentioned in the electronic device may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface is used for communication between the electronic equipment and other equipment.
The Memory may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components.
The system provided by the embodiment of the invention can be applied to electronic equipment. Specifically, the electronic device may be: desktop computers, laptop computers, intelligent mobile terminals, servers, and the like. Without limitation, any electronic device that can implement the present invention is within the scope of the present invention.
For the device/electronic apparatus/storage medium embodiment, since it is basically similar to the system embodiment, the description is simple, and the relevant points can be referred to the partial description of the system embodiment.
It should be noted that the electronic device and the storage medium according to the embodiments of the present invention are respectively an electronic device and a storage medium to which the scattering imaging method based on speckle field polarization common mode rejection is applied, and all embodiments of the scattering imaging method based on speckle field polarization common mode rejection are applicable to the apparatus, the electronic device and the storage medium, and can achieve the same or similar beneficial effects.
By applying the terminal equipment provided by the embodiment of the invention, proper nouns and/or fixed phrases can be displayed for a user to select, so that the input time of the user is reduced, and the user experience is improved.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a system, apparatus (device), or computer program product. Accordingly, this application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects that may all generally be referred to herein as a "module" or "system. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. A computer program stored/distributed on a suitable medium supplied together with or as part of other hardware, may also take other distributed forms, such as via the Internet or other wired or wireless telecommunication systems.
The present application is described with reference to flowchart illustrations and/or block diagrams of systems, apparatus (devices) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A scatter imaging system based on speckle field polarization common mode rejection, comprising: the device comprises a light source, a first module, a second module and a third module; wherein,
the first module is positioned at one side of the light source and used for modulating light rays emitted by the light source and generating linearly polarized light, and the first module comprises a diaphragm, a collimating lens and a first polarization modulator;
the second module is positioned on one side of the first module, which is far away from the light source, and is used for modulating the speckle image generated by the scattering medium, and the second module comprises an imaging target, the scattering medium and a second polarization modulator;
the third module is located on one side of the second module, which is far away from the first module, and is used for receiving and imaging the modulated speckle images, the speckle images contain information of the imaging target, and the third module comprises a detector and a computing unit.
2. The speckle field polarization common mode rejection based scatter imaging system of claim 1, wherein the spectral band of the light source is visible light.
3. The speckle field polarization common mode rejection based scatter imaging system of claim 1, wherein the first polarization modulator is located on a side of the aperture away from the light source, the collimating lens being located between the aperture and the first polarization modulator;
the light source, the diaphragm and the collimating lens are all located on the same optical axis.
4. The speckle field polarization common mode rejection based scatter imaging system of claim 3, wherein the imaging target is located on a side of the first module away from the light source, the scattering medium is located on a side of the imaging target away from the first module, and the second polarization modulator is located between the scattering medium and the third module.
5. The speckle field polarization common mode rejection based scatter imaging system of claim 4, wherein the detector is located between the second module and the computational unit.
6. The speckle field polarization common mode rejection based scatter imaging system of claim 1, wherein the scattering medium is ground glass.
7. A scatter imaging method based on speckle field polarization common mode rejection is characterized in that a computing unit applied to the scatter imaging system based on speckle field polarization common mode rejection according to any one of claims 1 to 6 comprises:
collecting speckle images of the second polarization modulator under the modulation of different polarization azimuth angles according to a preset interval angle;
determining an autocorrelation function for each of the speckle images;
determining a first speckle image corresponding to a maximum autocorrelation peak value and a second speckle image corresponding to a minimum autocorrelation peak value according to the autocorrelation function of the speckle images and the peak correlation energy evaluation index of the autocorrelation function, and calculating to obtain a speckle polarization differential image;
determining an autocorrelation function of the information of the imaging target according to the speckle polarization differential image;
and obtaining the Fourier amplitude of the imaging target according to the Venezlndication theory and the autocorrelation function of the information of the imaging target, and obtaining an imaged image through phase recovery.
8. The scatter imaging method based on speckle field polarization common mode rejection of claim 7, wherein the step of collecting the speckle images gated by the second polarization modulator under different optical axis angles according to a preset interval angle comprises:
acquiring a polarization azimuth angle of a first polarization modulator, and adjusting a polarization starting angle of a second polarization modulator to be the azimuth angle of the first polarization modulator;
acquiring speckle images of the second polarization modulator under different polarization azimuth angles according to a preset interval angle from the polarization starting angle;
wherein the preset interval angle is 5 °.
9. The speckle field polarization common mode rejection based scatter imaging method of claim 7, wherein the autocorrelation function of each of the speckle images is determined according to the formula:
wherein I represents the speckle field intensity, J1Representing a first order bezier function, D represents the speckle diameter,
the distance between the centers of the speckles at different positions in the speckles is represented, Deltax represents the difference between the abscissa of the center of the speckle and the abscissa of the different positions in the speckles, Delay represents the difference between the ordinate of the center of the speckle and the ordinate of the different positions in the speckles, Lambda represents the wavelength of the light wave, z represents the transmission distance of the light field, and Gamma is representedIRepresenting the autocorrelation function of the speckle field.
10. The speckle field polarization common mode rejection based scatter imaging method of claim 9, wherein the autocorrelation function of the information of the imaged object is determined according to the following formula:
where it denotes the autocorrelation operation, O denotes the light field of the imaged object, delta denotes the impulse function, and alphaiRepresenting the superposition coefficient, alpha, of the ith narrow-spectrum sub-light sourcejDenotes the superposition coefficient, λ, of the jth narrow-spectrum sub-light sourceiDenotes the ith narrow-spectrum sub-light source, Δ λiIndicating the spectral width of the ith narrow-spectrum sub-source.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115541536A (en) * | 2022-08-24 | 2022-12-30 | 西安电子科技大学 | Dynamic scattering imaging device and method using speckle field polarization characteristics |
| CN115718373A (en) * | 2022-11-11 | 2023-02-28 | 西安电子科技大学 | Speckle super-resolution imaging system and method based on polarization gating |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090295933A1 (en) * | 2006-05-09 | 2009-12-03 | Yoav Schechner | Imaging Systems and Methods for Recovering Object Visibility |
| CN105005053A (en) * | 2015-07-13 | 2015-10-28 | 西安电子科技大学 | Random scattering correlated imaging system based on LED illumination, and imaging method thereof |
| CN107895348A (en) * | 2017-10-23 | 2018-04-10 | 天津大学 | A kind of polarization image restored method under the nonuniform illumination in scattering environments |
| WO2020244952A1 (en) * | 2019-06-07 | 2020-12-10 | Ecole Polytechnique Federale De Lausanne (Epfl) | System and method for projecting images through scattering media |
| CN112161953A (en) * | 2020-08-25 | 2021-01-01 | 西安电子科技大学 | Wide-spectrum single-frame scattering imaging method based on scattering medium |
-
2021
- 2021-06-02 CN CN202110615725.1A patent/CN113567396B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090295933A1 (en) * | 2006-05-09 | 2009-12-03 | Yoav Schechner | Imaging Systems and Methods for Recovering Object Visibility |
| CN105005053A (en) * | 2015-07-13 | 2015-10-28 | 西安电子科技大学 | Random scattering correlated imaging system based on LED illumination, and imaging method thereof |
| CN107895348A (en) * | 2017-10-23 | 2018-04-10 | 天津大学 | A kind of polarization image restored method under the nonuniform illumination in scattering environments |
| WO2020244952A1 (en) * | 2019-06-07 | 2020-12-10 | Ecole Polytechnique Federale De Lausanne (Epfl) | System and method for projecting images through scattering media |
| CN112161953A (en) * | 2020-08-25 | 2021-01-01 | 西安电子科技大学 | Wide-spectrum single-frame scattering imaging method based on scattering medium |
Non-Patent Citations (4)
| Title |
|---|
| 代伟佳: "基于LED照明的无透镜散射成像方法研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
| 刘飞 等: "基于稀疏低秩特性的水下非均匀光场偏振成像技术研究", 《物理学报》 * |
| 李景镇: "《光学手册 上卷》", 31 July 2010, 陕西科学技术出版社 * |
| 韩平丽: "水下目标偏振成像探测技术研究", 《中国博士学位论文全文数据库 信息科技辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115541536A (en) * | 2022-08-24 | 2022-12-30 | 西安电子科技大学 | Dynamic scattering imaging device and method using speckle field polarization characteristics |
| CN115541536B (en) * | 2022-08-24 | 2024-11-05 | 西安电子科技大学 | Dynamic scattering imaging device and method utilizing speckle field polarization characteristics |
| CN115718373A (en) * | 2022-11-11 | 2023-02-28 | 西安电子科技大学 | Speckle super-resolution imaging system and method based on polarization gating |
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