阅读说明：本技术 一种基于led全息显示的失焦现象优化方法及系统 (Defocusing phenomenon optimization method and system based on LED holographic display ) 是由 桑新柱 彭程 李会 赵昕 陈铎 颜玢玢 于 2020-05-25 设计创作，主要内容包括：本发明实施例提供一种基于LED全息显示的失焦现象优化方法及系统。该方法包括：获取LED参考光源,将所述LED参考光源输入参考光预色散系统,得到预色散参考光；获取目标物体的预设图像集合,进行二维波长分布修正的衍射,生成校正后的计算全息图；将所述校正后的计算全息图和所述预色散参考光输入至空间光调制器,得到目标物体的再现像。本发明实施例通过参考光预色散系统,减小了光源谱宽造成的“色模糊”现象,并通过改进生成计算全息图的算法,对光路变化造成的成像面倾斜进行了校正,减小了成像结果的失焦,使成像质量获得显著提升。(The embodiment of the invention provides a defocusing phenomenon optimization method and system based on LED holographic display. The method comprises the following steps: obtaining an LED reference light source, and inputting the LED reference light source into a reference light pre-dispersion system to obtain pre-dispersion reference light; acquiring a preset image set of a target object, performing diffraction of two-dimensional wavelength distribution correction, and generating a corrected computed hologram; and inputting the corrected computed hologram and the pre-dispersed reference light into a spatial light modulator to obtain a reconstructed image of the target object. According to the embodiment of the invention, the color blur phenomenon caused by the spectral width of the light source is reduced through the reference light pre-dispersion system, the inclination of an imaging plane caused by the change of an optical path is corrected by improving the algorithm for generating the calculation hologram, the defocusing of an imaging result is reduced, and the imaging quality is obviously improved.)

1. A defocusing phenomenon optimization method based on LED holographic display is characterized by comprising the following steps:

obtaining an LED reference light source, and inputting the LED reference light source into a reference light pre-dispersion system to obtain pre-dispersion reference light;

acquiring a preset image set of a target object, performing diffraction of two-dimensional wavelength distribution correction, and generating a corrected computed hologram;

and inputting the corrected computed hologram and the pre-dispersed reference light into a spatial light modulator to obtain a reconstructed image of the target object.

2. The method for optimizing the out-of-focus phenomenon based on the LED holographic display according to claim 1, wherein the acquiring a preset image set of the target object, performing diffraction for two-dimensional wavelength distribution correction, and generating the corrected computed hologram specifically comprises:

acquiring a gray level image and a depth image of the target object;

calculating a wavelength two-dimensional distribution function of the front surface of the spatial light modulator;

and obtaining the corrected computed hologram based on the gray level image, the depth image and the wavelength two-dimensional distribution function.

3. The method for optimizing the out-of-focus phenomenon based on the LED holographic display according to claim 2, wherein the acquiring the gray scale image and the depth image of the target object specifically comprises:

the grayscale image and the depth image are obtained from the relative positions of the observer and the target object, and are denoted as a (x, y) and d (x, y), respectively.

4. The method for optimizing the defocusing phenomenon based on LED holographic display according to claim 2, wherein the calculating the wavelength two-dimensional distribution function of the surface of the spatial light modulator specifically comprises:

wherein λ (x, y) is a wavelength distribution expression of the surface of the spatial light modulator, λ₁，λ₂Respectively, the boundary value of the spectral width of the light source, x₁，x₂，y₁，y₂Δ λ is the spectral width at any point on the surface of the spatial light modulator, which is the coordinate boundary of the spatial light modulator in space.

5. The method for optimizing the out-of-focus phenomenon based on the LED holographic display according to claim 2, wherein the obtaining the corrected computed hologram based on the grayscale image and the depth image specifically includes:

the corrected computed hologram E (u, v) is:

wherein:wherein Δ x and Δ y are respectively the length and width of the minimum sampling unit of the cross section of the target object, pitch is the pixel pitch of the spatial light modulator, and a (x, y) and d (x, y) respectively represent the grayscale image and the depth image.

6. The method for optimizing the out-of-focus phenomenon based on the LED holographic display according to claim 1, wherein the obtaining of the LED reference light source and the inputting of the LED reference light source into the reference light pre-dispersion system to obtain the pre-dispersion reference light specifically comprises:

acquiring the LED reference light source, and sequentially projecting the LED reference light source into an aperture diaphragm, a cylindrical lens, a polaroid and an adjustable slit to obtain initial modulation reference light;

and projecting the initial modulation reference light into a preset dispersion element, a cylindrical surface beam expanding lens group and a reflector to obtain the pre-dispersion reference light.

7. The method of claim 6, wherein the predetermined dispersion element comprises a triangular prism that pre-processes the LED reference light source.

8. A defocusing phenomenon optimization system based on LED holographic display is characterized by comprising:

the light path module is used for acquiring an LED reference light source, and inputting the LED reference light source into the reference light pre-dispersion system to obtain pre-dispersion reference light;

the algorithm module is used for acquiring a preset image set of a target object, performing diffraction of two-dimensional wavelength distribution correction and generating a corrected calculation hologram;

and the modulation module is used for inputting the corrected computed hologram and the pre-dispersed reference light into a spatial light modulator to obtain a reproduced image of a target object.

9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of the method for optimizing out-of-focus phenomena based on LED holographic displays according to any of claims 1 to 7.

10. A non-transitory computer readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method for optimizing the out-of-focus phenomenon for LED-based holographic displays according to any of claims 1 to 7.

Technical Field

The invention relates to the technical field of photoelectric holography, in particular to a defocusing phenomenon optimization method and system based on LED holographic display.

Background

In the traditional holographic technology, interference photography is required, a holographic dry plate is used for recording interference fringes, and then the holographic dry plate is irradiated by reference light to obtain a reproduced image, so that the real-time performance and the repeatability are poor, and the application scene is very limited. In 1980, with the progress of computer technology and the advent of spatial light modulators, the computer-generated hologram technology has been rapidly developed, and a computer-encoded computer-generated hologram can be input to the spatial light modulator and a reconstructed image of a target object can be obtained by irradiating the spatial light modulator with reference light. The computed holography obtains the computed hologram through numerical computation, so that an interference photography process with extremely high requirements on light source coherence is avoided; when the computer generated hologram is optically reproduced, the requirement for the coherence of the reference light is low, and the computer generated hologram experiment using the LED is feasible.

Compared with laser, the LED has the following advantages: (1) speckle noise is avoided, and the imaging result is better in appearance; (2) the LED is a weak coherent light source, has certain coherence and is enough to be used for carrying out a computer holographic experiment; (3) the brightness is lower, and the human eye is more friendly. However, the LED coherence is poorer than the laser, which can affect the imaging quality to a certain extent, and the imaging result is out of focus, the sharpness of the reproduced image is reduced, the human eye loses the depth criterion, and the stereoscopic impression of the reproduced image is seriously reduced.

The phenomenon of defocus is theoretically due to two causes, namely "line blur" and "color blur". The aperture diaphragm is arranged behind the light source, so that the influence of line blurring can be reduced, and the aperture diaphragm is close to the light source, so that too much light energy loss can not be caused. Meanwhile, the 4F filtering system can reduce the influence of color blur, and this operation actually eliminates a large number of components with different wavelengths through filtering, reduces the spectral width of the whole reference light, improves the temporal coherence of the reference light, but causes a large amount of light energy loss at the same time, resulting in too low brightness of the reproduced image and difficulty in direct viewing by human eyes.

Disclosure of Invention

The embodiment of the invention provides a defocusing phenomenon optimization method and system based on LED holographic display, which are used for solving the problems in the prior art.

In a first aspect, an embodiment of the present invention provides a defocus optimization method based on LED holographic display, including:

obtaining an LED reference light source, and inputting the LED reference light source into a reference light pre-dispersion system to obtain pre-dispersion reference light;

acquiring a preset image set of a target object, performing diffraction of two-dimensional wavelength distribution correction, and generating a corrected computed hologram;

and inputting the corrected computed hologram and the pre-dispersed reference light into a spatial light modulator to obtain a reconstructed image of the target object.

Further, the acquiring a preset image set of the target object, performing diffraction of two-dimensional wavelength distribution correction, and generating a corrected computed hologram specifically includes:

acquiring a gray level image and a depth image of the target object;

calculating a wavelength two-dimensional distribution function of the front surface of the spatial light modulator;

and obtaining the corrected computed hologram based on the gray level image, the depth image and the wavelength two-dimensional distribution function.

Further, the acquiring the gray-scale image and the depth image of the target object specifically includes:

the grayscale image and the depth image are obtained from the relative positions of the observer and the target object, and are denoted as a (x, y) and d (x, y), respectively.

Further, the calculating a wavelength two-dimensional distribution function of the surface of the spatial light modulator specifically includes:

wherein λ (x, y) is a wavelength distribution expression of the surface of the spatial light modulator, λ₁,λ₂Respectively, the boundary value of the spectral width of the light source, x₁,x₂,y₁,y₂Δ λ is the spectral width at any point on the surface of the spatial light modulator, which is the coordinate boundary of the spatial light modulator in space.

Further, the obtaining the corrected computed hologram based on the grayscale image and the depth image specifically includes:

the corrected computed hologram E (u, v) is:

wherein:

wherein Δ x and Δ y are respectively the length and width of the minimum sampling unit of the cross section of the target object, pitch is the pixel pitch of the spatial light modulator, and a (x, y) and d (x, y) respectively represent the grayscale image and the depth image.

Further, the obtaining of the LED reference light source, inputting the LED reference light source into the reference light pre-dispersion system to obtain pre-dispersion reference light, specifically includes:

acquiring the LED reference light source, and sequentially projecting the LED reference light source into an aperture diaphragm, a cylindrical lens, a polaroid and an adjustable slit to obtain initial modulation reference light;

and projecting the initial modulation reference light into a preset dispersion element, a cylindrical surface beam expanding lens group and a reflector to obtain the pre-dispersion reference light.

Further, the preset dispersion element comprises a triangular prism, and the triangular prism preprocesses the LED reference light source.

In a second aspect, an embodiment of the present invention provides a defocusing phenomenon optimization system based on LED holographic display, including:

the light path module is used for acquiring an LED reference light source, and inputting the LED reference light source into the reference light pre-dispersion system to obtain pre-dispersion reference light;

the algorithm module is used for acquiring a preset image set of a target object, performing diffraction of two-dimensional wavelength distribution correction and generating a corrected calculation hologram;

and the modulation module is used for inputting the corrected computed hologram and the pre-dispersed reference light into a spatial light modulator to obtain a reproduced image of a target object.

In a third aspect, an embodiment of the present invention provides an electronic device, including:

the computer program comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the steps of any one of the LED holographic display-based defocus phenomenon optimization methods.

In a fourth aspect, an embodiment of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of any one of the methods for optimizing the out-of-focus phenomenon based on LED holographic display.

According to the defocusing phenomenon optimization method and system based on LED holographic display, provided by the embodiment of the invention, the color blur phenomenon caused by the spectral width of a light source is reduced through the reference light pre-dispersion system, the inclination of an imaging surface caused by the change of an optical path is corrected by improving the algorithm for generating the computed hologram, the defocusing of an imaging result is reduced, and the imaging quality is obviously improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a general flowchart of a defocus optimization method based on LED holographic display according to an embodiment of the present invention;

FIG. 2 is a flowchart illustrating operation of an embodiment of the present invention;

FIG. 3 is a grayscale image and a depth image of a target object provided by an embodiment of the invention;

FIG. 4 is a schematic diagram of a reference light pre-dispersion system according to an embodiment of the present invention;

FIG. 5 is a graph of the results of an optical experiment for imaging plane tilt correction provided by an embodiment of the present invention;

FIG. 6 is a graph showing the results of comparative experiments provided by the examples of the present invention;

FIG. 7 is a structural diagram of a defocus optimization system based on LED holographic display according to an embodiment of the present invention;

fig. 8 is a block diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to solve the problems in the prior art, embodiments of the present invention provide a defocus optimization method based on LED holographic display, in which a holographic imaging system composed of a slit, a dispersion prism, and some other optical elements is involved, and a defocus phenomenon of an imaging result when an LED light source is used for holographic imaging can be reduced. The prism mainly functions as dispersion, and can be replaced by other dispersive optical elements (such as a dispersion grating) but the diffraction efficiency of the prism needs to be considered, so that the phenomenon that the imaging result is too dark due to too large propagation loss of the whole system is avoided. Spatial coherence is greatly improved after a light source emitted by an LED is subjected to pinhole filtering, and the line width of the light source becomes a main factor for degrading an imaging result.

Here, the embodiments of the present invention relate to the following terms:

computer Holography (CH): the computer numerical calculation is used for replacing the interference diffraction process in physical optics, and the hologram is generated by the computer, so that certain special functions which are difficult to realize or cannot be realized by optical holography can be realized.

Light Emitting Diode (LED), a commonly used light emitting device, emits light by energy released by recombination of electrons and holes, and is widely used in the field of illumination. The light emitting diode can efficiently convert electric energy into light energy, and has wide application in modern society, such as illumination, flat panel display, medical devices and the like.

And (4) defocusing, namely, the imaging result is not focused due to technical requirements or defects of an imaging system, and the whole picture is in a fuzzy state.

Color blurring: when holographic imaging is performed, the imaging result is blurred due to poor temporal coherence of the reference light, depending on the line width of the light source. If the amount of color blur exceeds the resolution of the human eye or viewing system, the imaging quality is affected.

Line blurring: when holographic imaging is performed, the imaging result is blurred due to poor spatial coherence of the reference light, depending on the light emitting area of the light source. If the amount of line blur exceeds the resolution of the human eye or viewing system, the imaging quality is affected.

Dispersive prism one of the optical prisms, the general cross-sectional shape of which is a geometric triangle, other shapes of dispersive prisms or sets of prisms for dispersion are also generally referred to as dispersive prisms. Of which the triangular prism is the most widely known type of optical prism.

Angular dispersion ratio: angular dispersion ratio is an important parameter of a light splitting element such as a grating and a prism. It represents the rate of change of angular position of the spectral line to wavelength, in international units rad/m or rad/nm.

Spatial Light Modulator (SLM): the micro liquid crystal display device is a core device of a system based on micro liquid crystal display technology, such as real-time optical information processing, optical interconnection, optical calculation and the like. The SLM may change the amplitude or intensity, phase, polarization, and wavelength of the spatial light distribution under control of an electrical or other signal. The read-out mode of the read-out light is divided into a reflective mode and a transmissive mode; splitting into optical addressing (OA-SLM) and electrical addressing (EA-SLM) according to an input control signal; according to the type of modulation mode, there are phase type, amplitude type and complex amplitude type.

Maximum diffraction angle: refers to the maximum included angle of the diffracted light ray deviating from the axis when the light ray is diffracted.

Fig. 1 is a general flowchart of a defocus optimization method based on LED holographic display according to an embodiment of the present invention, as shown in fig. 1, including:

s1, obtaining an LED reference light source, and inputting the LED reference light source into a reference light pre-dispersion system to obtain pre-dispersion reference light;

s2, acquiring a preset image set of the target object, performing diffraction of two-dimensional wavelength distribution correction, and generating a corrected calculation hologram;

and S3, inputting the corrected computed hologram and the pre-dispersed reference light into a spatial light modulator to obtain a reproduced image of the target object.

Specifically, the embodiment of the present invention implements pre-dispersion of the reference light by two major parts, which are respectively improved from the algorithm part and the optical path part, as shown in fig. 2. Firstly, the optical path part: after an LED reference light source is obtained, the LED reference light source is input to a reference light pre-dispersion system, pre-dispersion reference light is obtained through a series of light path modulation processing, and the pre-dispersion reference light is projected to a spatial light modulator; the algorithm part is as follows: preprocessing a target image to obtain a plurality of preset image sets, then performing diffraction aiming at two-dimensional wavelength distribution correction on the surface of the spatial light modulator, further generating a corrected calculation hologram, and inputting an improved algorithm into the spatial light modulator. And finally, obtaining a reproduced image of the target object through the common processing of the two parts.

According to the embodiment of the invention, the color blur phenomenon caused by the spectral width of the light source is reduced through the reference light pre-dispersion system, the inclination of an imaging plane caused by the change of an optical path is corrected by improving the algorithm for generating the calculation hologram, the defocusing of an imaging result is reduced, and the imaging quality is obviously improved.

Based on the above embodiment, the algorithm part in the method specifically includes:

acquiring a gray level image and a depth image of the target object;

calculating a wavelength two-dimensional distribution function of the front surface of the spatial light modulator;

and obtaining the corrected computed hologram based on the gray level image, the depth image and the wavelength two-dimensional distribution function.

Specifically, the first step is to obtain a grayscale image and a depth image of the target object according to the relative positions of the observer and the target object, as shown in fig. 3, the left side in fig. 3 is the grayscale image and the right side is the depth image, which are respectively denoted as a (x, y) and d (x, y).

And secondly, calculating a wavelength two-dimensional distribution function of the surface of the spatial light modulator, wherein after the system correction, the wavelength distribution function of the surface of the Spatial Light Modulator (SLM) can be calculated according to the following formula:

wherein λ (x, y) is a wavelength distribution expression of the SLM surface; lambda [ alpha ]₁,λ₂Is the boundary value of the spectral width of the light source; x is the number of₁,x₂,y₁,y₂Is the coordinate boundary of the SLM in space; and the delta lambda is the spectral width at a certain point of the SLM surface, is related to the slit width and the angular dispersion rate of the prism, and can be calculated according to data of experimental instruments.

Thirdly, generating a calculation hologram, wherein the improved calculation formula of the hologram is as follows:

wherein:

where Δ x and Δ y are the length and width (unit: mm) of the minimum sampling unit of the cross section of the target object, pitch is the pixel pitch (unit: mm) of the spatial light modulator, a (x, y) and d (x, y) are obtained from the first step, r (x, y) is calculated according to formula (3), and finally a corrected computed hologram can be generated by formula (2).

In an unmodified formula, the wavelength is taken as a constant, and the method can be simultaneously applied to the calculation and analysis of traditional optical holography, digital holography and computational holography; however, if the wavelength is regarded as a function with a two-dimensional distribution rule, both conventional optical holography and digital holography cannot be realized because the wavelength of light scattered by a target object to a certain direction cannot be controlled when performing interference photography, and the changed wavelength cannot be used as an additional parameter of a hologram. The method provided by the patent makes full use of the advantages of calculating the hologram, uses a computer to carry out numerical calculation to simulate the interference photography process, calculates the hologram from the holographic surface, takes the changed wavelength as an additional parameter of the holographic surface, corrects the imaging plane inclination caused by carrying out pre-dispersion on the reference light, and achieves the purpose of simultaneously reducing the optical energy loss and the color blur by matching the optical path with a corresponding algorithm.

Based on any of the above embodiments, the method specifically includes:

acquiring the LED reference light source, and sequentially projecting the LED reference light source into an aperture diaphragm, a cylindrical lens, a polaroid and an adjustable slit to obtain initial modulation reference light;

and projecting the initial modulation reference light into a preset dispersion element, a cylindrical surface beam expanding lens group and a reflector to obtain the pre-dispersion reference light.

The preset dispersion element comprises a triangular prism, and the triangular prism is used for preprocessing the LED reference light source.

Specifically, as shown in fig. 4, S is an LED light source, a is an aperture stop, L1, L2 are cylindrical lenses, F is a polarizer, S is an adjustable slit, P is a triangular prism, L3, L4 are cylindrical beam expanding lens groups, and M is a reflector.

It should be noted that the selection of the predetermined dispersion element is not exclusive, and the embodiment of the present invention employs a triangular prism in consideration of diffraction efficiency. When the intensity of the light source is sufficient, other optical elements with dispersion effect, such as a dispersion grating, can be used instead.

It will be appreciated that the coherence of the LED is still poor compared to the laser, which can affect the image quality to some extent, with "line blurring" and "colour blurring" occurring. Due to the limitation of the light emitting characteristics of the LED light source, line blurring and color blurring cannot be eliminated and can only be reduced to a certain extent. The intuitive perception of this blur is that the imaging result is "out of focus", i.e. near the set imaging position, the imaging result is less sharp and stereoscopic impression is lost. Line blurring is caused by poor spatial coherence of a light source, a generally used patch type LED light source has a large light emitting area, and the spatial coherence of the light source can be improved by placing an aperture diaphragm behind the light source. Color blur is caused by the large spectral width of the LED, and a 4F system can be used for filtering, but a large amount of light energy is lost, so that the imaging result is too dark.

The spatial light modulator used for computer holography is a diffraction element with a grid structure, and the existence of the grid structure enables the holographic display technology based on the spatial light modulator to be greatly different from the traditional holographic display technology. Firstly, when the reference light passes through the spatial light modulator due to the grid structure, a series of small-hole diffraction waves are formed, and the diffraction waves are coherently superposed on an imaging surface to form a reconstructed image, which is also a theoretical basis for generating a computed hologram. Furthermore, due to process limitations, the area of the clear aperture and the thickness of the liquid crystal layer cannot be made small, which results in the energy of the diffracted waves from the aperture being concentrated mainly near the axis, i.e. the maximum diffraction angle is small.

The color blurring phenomenon in the computer generated hologram is caused by dispersion generated by the reference light with poor monochromaticity passing through the grid structure of the spatial light modulator. The patent proposes a method, aiming at the characteristic of rasterization of a spatial light modulator, pre-dispersing reference light, reducing color blur caused by dispersion when the reference light passes through a rasterization structure, and because the maximum diffraction angle of a grid pore is very small, even if the reference light is used, diffraction waves generated by diffraction pores with close spatial distance can still be approximately coherently superposed, and only an imaging plane can be inclined. We have accordingly improved the algorithm for generating the computed hologram to correct for the tilt of the imaging plane caused by the variation in the reference light.

The optical system which utilizes the elements such as the triangular prism and the like to carry out pre-dispersion on the reference light is matched with the corresponding algorithm, so that the negative influence of color blurring on an imaging result can be reduced, and meanwhile, the great loss of light energy is avoided.

The resolution of the computed hologram used in the embodiment of the present invention is 1024 × 1024, and it can be seen from the experimental result of fig. 5 that the test chart can be correctly imaged on the same plane after being corrected.

Fig. 6 (a) is a reproduced image using LED reference light and a conventional scheme; fig. 6 (b) shows a reproduced image using the LED reference light and the scheme proposed in the present patent. The comparison shows that the embodiment of the invention corrects the imaging plane inclination caused by the change of the reference light by pre-dispersing the reference light and correspondingly improving the method for generating the calculation hologram, reduces the color blur brought by the LED reference light to a certain extent and improves the imaging quality.

Fig. 7 is a structural diagram of a defocusing phenomenon optimization system based on LED holographic display according to an embodiment of the present invention, as shown in fig. 7, including: an optical path module 71, an algorithm module 72 and a modulation module 73; wherein:

the optical path module 71 is configured to obtain an LED reference light source, and input the LED reference light source into the reference light pre-dispersion system to obtain pre-dispersion reference light; the algorithm module 72 is configured to obtain a preset image set of the target object, perform diffraction for two-dimensional wavelength distribution correction, and generate a corrected computed hologram; the modulation module 73 is configured to input the corrected computed hologram and the pre-dispersed reference light to a spatial light modulator to obtain a reconstructed image of the target object.

The system provided by the embodiment of the present invention is used for executing the corresponding method, the specific implementation manner of the system is consistent with the implementation manner of the method, and the related algorithm flow is the same as the algorithm flow of the corresponding method, which is not described herein again.

According to the embodiment of the invention, the color blur phenomenon caused by the spectral width of the light source is reduced through the reference light pre-dispersion system, the inclination of an imaging plane caused by the change of an optical path is corrected by improving the algorithm for generating the calculation hologram, the defocusing of an imaging result is reduced, and the imaging quality is obviously improved.

Fig. 8 illustrates a physical structure diagram of an electronic device, and as shown in fig. 8, the electronic device may include: a processor (processor)810, a communication Interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication Interface 820 and the memory 830 communicate with each other via the communication bus 840. The processor 810 may call logic instructions in the memory 830 to perform the following method: obtaining an LED reference light source, and inputting the LED reference light source into a reference light pre-dispersion system to obtain pre-dispersion reference light; acquiring a preset image set of a target object, performing diffraction of two-dimensional wavelength distribution correction, and generating a corrected computed hologram; and inputting the corrected computed hologram and the pre-dispersed reference light into a spatial light modulator to obtain a reconstructed image of the target object.

In addition, the logic instructions in the memory 830 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

In another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to perform the transmission method provided in the foregoing embodiments when executed by a processor, and for example, the method includes: obtaining an LED reference light source, and inputting the LED reference light source into a reference light pre-dispersion system to obtain pre-dispersion reference light; acquiring a preset image set of a target object, performing diffraction of two-dimensional wavelength distribution correction, and generating a corrected computed hologram; and inputting the corrected computed hologram and the pre-dispersed reference light into a spatial light modulator to obtain a reconstructed image of the target object.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.