CN109410153B - Object phase recovery method based on coded aperture and spatial light modulator - Google Patents
Object phase recovery method based on coded aperture and spatial light modulator Download PDFInfo
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- CN109410153B CN109410153B CN201811497956.1A CN201811497956A CN109410153B CN 109410153 B CN109410153 B CN 109410153B CN 201811497956 A CN201811497956 A CN 201811497956A CN 109410153 B CN109410153 B CN 109410153B
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Abstract
An object phase recovery method based on a coded aperture and a spatial light modulator belongs to the field of phase recovery imaging. The invention solves the problem that the object needs to be smaller than the detection surface in the traditional phase recovery algorithm. Firstly, a coding aperture and a spatial light modulator are sequentially arranged between a sample and a detector; then, the sample is illuminated by utilizing the coherent light of the quasi-straight part and is received by a detector through the coded aperture and the spatial light modulator; thirdly, the modulation spatial light modulator changes the optical path of the light field to modulate the distance difference transmitted to the plane of the detector, so that different frequency spectrums are generated and received by the detector; and finally, recovering the complex amplitude of the sample through a phase recovery algorithm and a compressive sensing algorithm. The present invention can recover the sample corresponding to the size of the detection surface at one time and does not need to scan.
Description
Technical Field
An object phase recovery method based on a coded aperture and a spatial light modulator belongs to the field of phase recovery imaging, and is a computational image reconstruction technology.
Background
Phase retrieval is widely applied to various fields of biology, materials and the like as an image reconstruction technology, the complex amplitude of an object can be recovered from spectral intensity, experimental equipment is simple, a lens is not needed in many times, and therefore, no aberration exists, but the size of the object recovered by the technology is relatively small (more than 4 times smaller than the detector surface), the object needs to be scanned to solve the problem that the size of the recovered object is small, and the time resolution of the system can be reduced by the method.
Disclosure of Invention
The invention discloses an object phase recovery method based on a coded aperture and a spatial light modulator, which solves the problem of small object size by using the coded aperture, generates a multi-imaging distance intensity graph on a detector plane by introducing different optical paths through modulating the spatial light modulator, and solves the problem that a phase recovery algorithm needs to move a detector to detect the spectral intensity of different imaging distances in a time-sharing manner.
The purpose of the invention is realized as follows:
an object phase recovery method based on a coded aperture and a spatial light modulator comprises the following steps:
step a, firstly, building experimental equipment, and adding a coded aperture and a spatial light modulator in the traditional phase recovery equipment, wherein the coded aperture and the spatial light modulator are sequentially arranged between an object and a detector;
b, modulating the spatial light modulator, and receiving light field intensity graphs of different propagation distances on a detector plane;
c, restoring the complex amplitude at the coded aperture plane according to a traditional multi-distance phase recovery algorithm;
and d, further recovering the complex amplitude of the object from the complex amplitude at the coded aperture plane according to a compressive sensing algorithm.
Preferably, the coded aperture is a specially designed pattern or a random pattern, and the ratio of the light-transmitting area to the light-non-transmitting area is 1: 4.
Preferably, the multi-distance detection in conventional phase recovery is achieved by introducing different optical paths of the modulating spatial light modulator.
Firstly, a coding aperture and a spatial light modulator are sequentially arranged between a sample and a detector; then, the sample is illuminated by utilizing the coherent light of the quasi-straight part and is received by a detector through the coded aperture and the spatial light modulator; thirdly, the modulation spatial light modulator changes the optical path of the light field to modulate the distance difference transmitted to the plane of the detector, so that different frequency spectrums are generated and received by the detector; and finally, recovering the complex amplitude of the sample through a phase recovery algorithm and a compressive sensing algorithm. The problem that the size of a recovered object is small can be solved by adding the coded aperture in the traditional phase recovery technology, and due to the introduction of the spatial light modulator, the final recovery effect can be improved and the recovery speed can be accelerated by introducing different optical paths through modulating the spatial light modulator to cause the detection of a multi-distance spectrum intensity diagram.
Drawings
FIG. 1 is a schematic diagram of the optical path of the object phase recovery method based on coded aperture and spatial light modulator according to the present invention;
fig. 2 is a flow chart of the object phase recovery method based on the coded aperture and the spatial light modulator.
Detailed Description
The following detailed description is provided in conjunction with the accompanying drawings and specific embodiments for further understanding of the objects and technical solutions of the present invention.
The specific implementation steps are as follows:
step a, firstly, building experimental equipment according to the graph shown in figure 1;
b, introducing different optical paths into the modulation spatial light modulator, and receiving optical field intensity graphs of different propagation distances on a detector plane;
c, restoring the complex amplitude at the coded aperture plane according to a traditional multi-distance phase recovery algorithm;
and d, further recovering the complex amplitude of the object from the complex amplitude at the coded aperture plane according to a compressive sensing algorithm.
The specific calculation process of the object phase recovery method based on the coded aperture and the spatial light modulator is as follows:
s1: detecting by a modulation spatial light modulator to obtain a spectrum intensity image l1, initializing a spectrum at a position of a coding aperture to obtain an initial spectrum F1, wherein a detector plane s1 after the modulation spatial light modulator is equivalent to a new detector plane s1 formed by changing the position of a detector in a corresponding traditional phase recovery device;
s2: the initial spectrum F1 propagates for a certain distance in free space after being modulated by the spatial modulator, and reaches the detector plane s1 to obtain a spectrum F11;
s3: replacing the amplitude of the F11 with the spectrum intensity image l1, preserving the phase, continuously transmitting to a detector plane s2 of the remodulation spatial light modulator, and obtaining a spectrum intensity image l2 by the remodulation spatial light modulator;
s4: obtaining a frequency spectrum F12 at a detector plane s2, continuously replacing the amplitude of the F12 with l2, modulating the spatial light modulator for n times to obtain l1, l2, ln frequency spectrum intensity graphs, and then propagating until all the frequency spectrum intensity graphs ln participate in calculation;
s5: back propagating to the coded aperture plane to obtain a complex amplitude and multiplying the complex amplitude by a known coded aperture function;
s6: repeating the steps S2-S5K times;
s7: and judging whether the execution is performed for K times, if so, restoring the complex amplitude of the object by using a compressed sensing algorithm, and if not, entering S2.
To further optimize the above solution, the coded aperture function is determined from the coded aperture setting and is known.
The present invention is not limited to the above-described preferred embodiments, and any structural changes or process modifications made in the light of the present invention shall be construed as being within the scope of the present invention, and all technical solutions similar or equivalent to the present invention shall be construed as being included in the present invention.
Claims (3)
1. An object phase recovery method based on a coded aperture and a spatial light modulator, characterized by comprising the following steps:
step a, firstly, building experimental equipment, and adding a coded aperture and a spatial light modulator in the traditional phase recovery equipment, wherein the coded aperture and the spatial light modulator are sequentially arranged between an object and a detector;
b, modulating the spatial light modulator, and generating light field intensity graphs with different propagation distances on a detector plane;
c, restoring the complex amplitude at the coded aperture plane by using the light field intensity map according to the traditional multi-distance phase recovery algorithm;
and d, further recovering the complex amplitude of the object from the complex amplitude at the coded aperture plane according to a compressive sensing algorithm.
2. The method of claim 1, wherein the coded aperture is a specially designed pattern or a random pattern, and the ratio of the transparent area to the opaque area is 1: 4.
3. The coded aperture and spatial light modulator-based object phase retrieval method of claim 1, wherein multi-distance detection in conventional phase retrieval is achieved by modulating the spatial light modulator to introduce different optical paths.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102859389A (en) * | 2010-04-30 | 2013-01-02 | 伊斯曼柯达公司 | Range measurement using a coded aperture |
| CN102891956A (en) * | 2012-09-25 | 2013-01-23 | 北京理工大学 | Method for designing compression imaging system based on coded aperture lens array |
| CN103428500A (en) * | 2013-08-31 | 2013-12-04 | 西安电子科技大学 | Super-resolution large-view-field infrared imaging method |
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| US8558182B2 (en) * | 2009-10-09 | 2013-10-15 | University Of Rochester | Optical element, device, method, and applications |
| US10162161B2 (en) * | 2014-05-13 | 2018-12-25 | California Institute Of Technology | Ptychography imaging systems and methods with convex relaxation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102859389A (en) * | 2010-04-30 | 2013-01-02 | 伊斯曼柯达公司 | Range measurement using a coded aperture |
| CN102891956A (en) * | 2012-09-25 | 2013-01-23 | 北京理工大学 | Method for designing compression imaging system based on coded aperture lens array |
| CN103428500A (en) * | 2013-08-31 | 2013-12-04 | 西安电子科技大学 | Super-resolution large-view-field infrared imaging method |
Non-Patent Citations (2)
| Title |
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| Multiplexed phase-space imaging for 3D fluorescence microscopy;Hsiou-Yuan Liu等;《Optics Express》;20170626;第25卷(第13期);全文 * |
| 基于多距离相位恢复的无透镜计算成像技术;刘正君等;《红外与激光工程》;20181031;全文 * |
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