Improved wavelet hierarchical threshold filter method for optical coherence tomography image de-noising  

作　　者：Jing Cao Pinghe Wang Bo Wu Guohua Shi Yan Zhang Xiqi Li Yudong Zhang Yong Liu 

机构地区：[1]School of Optoelectronic Information University of Electronic Science and Technology of China No.4,Section 2,North Jianshe Road Chengdu 610054,P.R.China [2]College of Optoelectronic Technology Chengdu University of Information Technology Chengdu 610225,P.R.China [3]Suzhou Institute of Biomedical Engineering and Technology Chinese Academy of Sciences Suzhou 215163,P.R.China [4]School of Electronic and Communication Engineering Guiyang University Guiyang 550005,P.R.China [5]Institute of Optics and Electronics Chinese Academy of Sciences Chengdu 610209,P.R.China [6]Chinese Academy of Sciences The Key Laboratory on Adaptive Optics Chengdu 610209,P.R.China

出　　处：《Journal of Innovative Optical Health Sciences》2018年第3期54-64,共11页创新光学健康科学杂志（英文）

基　　金：supported by National Nature Science Foundation of China(Nos.61378090,61421002,61505036,61327004,61435003 and 61675226);the Sichuan Province International Cooperative Project(No.2015HH0056);the National Key R&D Program of China(Nos.2016YFF0102000,2016YFF0102003);the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB02060000);the Frontier Science Research Project of the Chinese Academy of Sciences(No.QYZDB-SSW-JSC03);the Jiangsu Province Science Fund for Distinguished Young Scholars(No.BK20060010).

摘　　要：According to the speckle feature in Optical coherence tomography(OCT),images with speckleindicate not only noise but also signals,an improved wavelet hierarchical threshold filter(IWHTF)method is proposed.At first,a modified hierarchical threshold-selected algorithm isused to prevent signals from being removed by asssing suitable thresholds for different noiselevels,Then,an improved wavelet threshold function based on two traditional threshold fumnc.tions is proposed to trade-ff betwen speckle removing and sharpness degradation.The de-noising results of an OCT finger skin image shows that the IWHTF method obtains betterobjective evaluation metrics and visual image quality improvement,Whenαa=0.2,β=5.0 andK=1.2,the improved method can achieve 9.58 dB improvement in signal-to-noise ratio,withsharpnesdegraded by 3.81%.

关 键 词：Optical coherence tomography WAVELETS SPECKLE 

分 类 号：TN9[电子电信—信息与通信工程]