Speckle reduction in digital holography with non-local means filter based on the Pearson correlation coefficient and Butterworth filter

• DOI: 10.1364/ol.444769
• Publication Date: 2021-12-07T15:01:44Z
• Authors: Kai Chen; Li Chen; JiaQi Xiao; JinYang Li; YiHua Hu; KunHua Wen
• Keywords: Butterworth filter; Non-Local Means; Speckle noise

This Letter presents a non-local means filter based on the Pearson correlation coefficient and Butterworth high-pass filter. In method, new gray value of denoising pixel is equal to weighted sum surrounding values. We use between pixels calculate weight pixel, then optimize. Experimental results show that method effectively reduces speckle noise digital holography image details are also very rich. At same time, its performance still better when compared with methods such as BM3D.