A correlation imaging method based on fractional Fourier transform

A fractional Fourier, correlated imaging technology, applied in image enhancement, image analysis, image data processing and other directions, can solve the problem of low imaging quality and security, to increase security, reduce environmental noise, and improve imaging quality Effect

Active Publication Date: 2019-01-18
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] However, although various technologies for "ghost" imaging have been developed, traditional correlation imaging uses random speckle for imaging, and the imaging quality is not high and there are also problems in safety.

Method used

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  • A correlation imaging method based on fractional Fourier transform
  • A correlation imaging method based on fractional Fourier transform
  • A correlation imaging method based on fractional Fourier transform

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Embodiment Construction

[0037] A correlation imaging method based on fractional Fourier transform, comprising the steps of:

[0038] S1: According to the two-dimensional fractional Fourier transform kernel The definition of and the order P of the fractional order 1 ,P 2 Design Fractional Speckle And load the designed speckle onto the digital micromirror array (DMD);

[0039] In the step S1, the two-dimensional fractional Fourier transform kernel The definition formula is:

[0040]

[0041] or

[0042]

[0043] Among them, α=p 1 π / 2, β=p 2 π / 2, α, β are the rotation angles of the transformation domain relative to the space domain after the signal passes through the fractional Fourier transform, p 1 and p 2 is the order of fractional Fourier transform, -1≤P 1 ,P 2 ≤1;

[0044]In addition, in the step S1, the fractional order speckle The formula is:

[0045]

[0046] Among them, (x, y) represents the coordinates in the Cartesian coordinate system, a refers to the average value...

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Abstract

The invention discloses a correlation imaging method based on fractional Fourier transform, by irradiating the generated specific fractional speckle onto the object, then using a barrel detector without spatial resolution to receive the light transmitted or reflected by the object to be imaged, and finally using the inverse fractional Fourier transform to obtain the image of the object to be imaged in the case of obtaining the order of speckle design. The invention introduces the sparsity of the fractional-order Fourier transform in the transform domain into the correlation imaging, which canimprove the imaging quality of the correlation imaging. At the same time, fractional order is introduced into correlation imaging, and the order set when fractional order speckle is designed is used as the key to recover the object. Only when the correct key is obtained, the correct recovered object can be obtained, and the security of correlation imaging can be effectively improved by this scheme. The invention has the advantages of simple structure and convenient realization, is suitable for the situation of high requirements on imaging quality and safety, and has great application prospect.

Description

technical field [0001] The invention relates to a correlation imaging method, in particular to a correlation imaging method based on fractional Fourier transform, and belongs to the field of correlation imaging. Background technique [0002] Correlated Imaging, also known as Ghost Imaging (GI), is one of the frontiers and hotspots in the field of quantum optics in recent years. Correlation imaging uses two optical paths, one is called the signal optical path, which means that the light after the speckle passes through the object is received by a barrel detector without spatial resolution; the other is called the reference optical path, which means that the speckle passes through the object after a certain distance Received by detectors with spatial resolution. Finally, the second-order correlation is performed on the detection results of the two optical paths, and the restored image of the object can be obtained in the reference optical path. Different from the traditional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/10G06T5/00G06T1/00
CPCG06T1/0021G06T5/002G06T5/10G06T2207/20048G06T2207/10056G06T2201/0203
Inventor 陈莎赵生妹
Owner NANJING UNIV OF POSTS & TELECOMM
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