Denoising algorithm based on edge extraction and wavelet transform in digital holography

Ming Zhang; Xin-zhu Sang; Jun-min Leng; Xue-mei Cao

doi:10.1117/12.2032916

20 August 2013 Denoising algorithm based on edge extraction and wavelet transform in digital holography

Ming Zhang, Xin-zhu Sang, Jun-min Leng, Xue-mei Cao

Proceedings Volume 8913, International Symposium on Photoelectronic Detection and Imaging 2013: Optical Storage and Display Technology; 89130C (2013) https://doi.org/10.1117/12.2032916
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

Digital holography is a kind of coherent imaging method and inevitably affected by many factors in the process of recording. One of dominant problems is the speckle noise, which is essentially nonlinear multiplicative noise related to signals. So it is more difficult to remove than additive noise. Due to the noise pollution, the low resolution of image reconstructed is caused. A new solution for suppressing speckle noise in digital hologram is presented, which combines Canny filtering algorithm with wavelet threshold denoising algorithm. Canny filter is used to obtain the edge detail. Wavelet transformation performs denoising. In order to suppress speckle effectively and retain the image details as much as possible, Neyman-Pearson (N-P) criterion is introduced to estimate wavelet coefficient in every scale. An improved threshold function is proposed, whose curve is smoother. The reconstructed image is achieved by merging the denoised image with the edge details. Experimental results and performance parameters of the proposed algorithm are discussed and compared with other methods, which shows that the presented approach can not only effectively eliminate speckle noise, but also retain useful signals and edge information simultaneously.

Citation Download Citation

Ming Zhang, Xin-zhu Sang, Jun-min Leng, and Xue-mei Cao "Denoising algorithm based on edge extraction and wavelet transform in digital holography", Proc. SPIE 8913, International Symposium on Photoelectronic Detection and Imaging 2013: Optical Storage and Display Technology, 89130C (20 August 2013); https://doi.org/10.1117/12.2032916

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