Phase developing method

A phase unwrapping and phase technology, which is applied in the field of signal processing, can solve problems such as the inaccessibility of the integration path, the increase in the calculation amount and difficulty of branch setting, and the complexity of the best path selection, so as to eliminate the isolated area phenomenon, small error, and eliminate noise Effect
CN1975708AInactive Publication Date: 2007-06-06SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Publication Date
2007-06-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention is a phase unwrapping method to process coherent waves. The feature is: first to do vector filter on the phases containing remnant pixel, then to unwrap phases with reliability phase unwrapping method. The mentioned vector filter is to compute sine and cosine value of each pixel in the phase, and perform the average filtering on the continuous sine and cosine images, finally obtain the phase value of filtered interference image by inverse mapping; then wrap the phases with reliability phase unwrapping method: first construct the reliability, then wrap the phases in order according to the value of reliability.
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Description

technical field

[0001] The invention relates to signal processing, in particular to a method for phase unwrapping of coherent wave information processing. It is used in phase-shifting interferometry, synthetic aperture radar and medical nuclear magnetic resonance and other fields. Background technique

[0002] When it comes to coherent wave information processing, as long as the information of the processing object is represented by phase, the expression of arctangent function is used in the process of extracting phase information, and the phase expressed by arctangent function needs to be restored to the original phase distribution. This process called phase unwrapping.

[0003] The original data measured by the phase-shifting interferometer is an interferogram. The light intensity distribution of the interferogram is represented by I, then the light intensity distribution of the interference field coordinates (x, y) is:

[0004] I(x,y,t)=a(x,y)+b(x,y)cos[φ(x,y)+δ(t)] (1...

Claims

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