测试技术学报2011，Vol.25Issue(5)：455-460,6.DOI:10.3969/j.issn.1671-7449.2011.05.015
基于平稳小波/Contourlet域非线性扩散的印章图像去噪
Seal Image De-noising Based on Stationary Wavelet/Contourlet Transform and Nonlinear Diffusion
摘要
Abstract
In the seal imprint verification system, obtaining high quality preprocessed image is the prerequisite for correctly verifying the seal imprint of documents. A seal image de-noising method combining stationary wavelet/contourlet transform with nonlinear diffusion was proposed. Firstly, an image was decomposed by stationary wavelet/contourlet transform. Then adaptive-contrast-factor diffusion and total variation diffusion were applied to high-frequency components and low-frequency components, respectively. Finally the image was synthesized. The experimental results were given. Comparisons of the image de-noising results were made with those of the image de-noising methods based on the combination of wavelet shrinkage with total variation diffusion, and the combination of improved contourlet transform with adaptive-contrast-factor diffusion. Running time of the above-mentioned algorithms was also contrasted. It is shown that the proposed image de -noising methods based on stationary wavelet/contourlet transform and nonlinear diffusion can obtain superior results. They can both remove noise and preserve the original edges more efficiently.关键词
图像处理/印章鉴别/图像去噪/Contourlet变换/平稳小波变换/自适应对比度扩散/全变差扩散Key words
seal verification/ image de-noising/ contourlet transform/ stationary wavelet transform/ adaptive-分类
信息技术与安全科学引用本文复制引用
吴一全,侯雯,张晓杰,陈丹..基于平稳小波/Contourlet域非线性扩散的印章图像去噪[J].测试技术学报,2011,25(5):455-460,6.基金项目
国家自然科学基金资助项目(60872065) （60872065）
文件检验鉴定公安部重点实验室(中国刑事警察学院)资助课题(10KFKT005) （中国刑事警察学院）
