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Obtaining method of measurement matrixes of compression spectral imaging system

A technology of spectral imaging and acquisition method, applied in the field of compressed spectral imaging system

Active Publication Date: 2014-07-30
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

[0012] The purpose of the present invention is to propose a method for obtaining the measurement matrix of the compressed spectral imaging system based on random wavefront phase modulation, so as to solve the problem of how to quickly obtain the measurement matrix of the high signal-to-noise ratio of the system

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  • Obtaining method of measurement matrixes of compression spectral imaging system
  • Obtaining method of measurement matrixes of compression spectral imaging system
  • Obtaining method of measurement matrixes of compression spectral imaging system

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Embodiment Construction

[0052] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention should not be limited thereby.

[0053] image 3 It is a structural block diagram of an embodiment of the present invention. The original light source 8 emits broadband white light; the spectral filtering device 9 performs spectral filtering on the broadband white light to generate L narrow-band lights with different central wavelengths, which are spectral band 1, spectral band 2, ... spectral band L, L>1. The front imaging objective lens 2 images the object plane 1 onto the first imaging plane 3, and a pinhole diaphragm 10 is placed on the first imaging plane, and the aperture of the pinhole is D. The pinhole diaphragm 10 is fixed on the electric translation stage, and the electric translation stage is connected with the computer 7 through the data line, and the position of the pinhole diaphragm...

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Abstract

Disclosed is an obtaining method of measurement matrixes of a compression spectral imaging system based on random wave front phase modulation. When the method is used for obtaining the measurement matrixes of the compression spectral imaging system based on random wave front phase modulation, a broadband hot light source, a spectral filtering device, a pinhole diaphragm and a magnification imaging lens need to be added in a light path of the system. According to the obtaining method, the translation invariance of the local space of the compression spectral imaging system based on the random wave front phase modulation is used, and the measurement matrixes of the system are obtained through low measuring frequency; a high-contrast-ratio speckle field is obtained through the method that speckle light intensity distribution on an original detection face is magnified and imaged onto a detection face, and the signal to noise ratio of the measurement matrixes is increased.

Description

technical field [0001] The invention relates to a compressed spectral imaging system, in particular to a method for acquiring a measurement matrix of the compressed spectral imaging system based on random wavefront phase modulation. Background technique [0002] Compressed sensing theory is a brand-new signal acquisition, encoding and decoding theory. The basic principle is as follows: Suppose the length of the signal X to be measured is N, there is a certain representation Ψ=[Ψ 1 Ψ 2 …Ψ N ], expand X under representation Ψ as X=ΨX′. If X′ contains only a few non-zero elements or most of the element values ​​are small relative to other element values, we can say that the signal X is sparse or compressible under Ψ. Under this condition, the measurement matrix Φ that is not related to Ψ can be used to perform projection measurement on X, and the vector Y=ΦΨX' with length M can be obtained. Knowing ΦΨ and Y, through the recovery algorithm, X′ can be reconstructed with a hi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/28G01J1/00
Inventor 韩申生陈喆吴建荣
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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