Electronic Science and Technology ›› 2024, Vol. 37 ›› Issue (7): 81-88.doi: 10.16180/j.cnki.issn1007-7820.2024.07.011

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A Two-Stage Adaptive Non-Local Mean Filtering Method Based on Sine-Cosine Decomposition

SUN Yujuan, WANG Yawei, TANG Furui, GENG Yan, LI Yuchen, XU Yuanyuan   

  1. School of Physics and Electronic Engineering,Jiangsu University,Zhenjiang 212013,China
  • Received:2023-01-16 Online:2024-07-15 Published:2024-07-17
  • Supported by:
    National Natural Science Foundation of China(11874184)

Abstract:

In order to solve the problem of speckle noise in the wrapped phase diagram, a two-stage adaptive non-local mean filtering method based on sine and cosine decomposition is proposed. The proposed method realizes the adaption of the algorithm by improving the size and similarity measurement of the attenuation parameters twice. This method is used to denoise the sine and cosine components of the wrapped phase diagram. After denoising, the inverse tangent operation is used to obtain the clean wrapped phase, and unwrapping operation is carried out on the phase. The experimental and simulation results show that the proposed method not only effectively removes the noise in the wrapped phase diagram, but also preserves the edge information in the phase diagram. Compared with SCA(Sine Cosine Algorithm) method and BM3D(Block-Matching and 3D filtering) method, ENL(Equivalent Number of Looks) and SSI(Speckle Suppression Index) of the image denoised by the proposed method are the largest and the smallest, and the mean square error is increased by about two times. These results reveal that the proposed method can effectively remove the noise in the wrapped phase and improve the accuracy of phase unwrapping.

Key words: wrapped phase, speckle noise, sine cosine decomposition, two sections, similarity measure, adaptive, non-local mean, phase unwrapping

CLC Number: 

  • O439