中南大学学报（自然科学版）2011，Vol.42Issue(2)：404-408,5.
小波变换和子采样在彩色图像水印中的应用
Application of wavelet transform and subsampling in color image watermark
摘要
Abstract
In order to protect copyrights of multi-media data effectively, a novel color-image watermarking algorithm was proposed based on wavelet transform and subsampling.The watermark was scrambled by 2-D Arnold cat map, and the scrambled watermark was embedded into the low sub-bands when four sub-images of the Y branch of host image were transformed by two-level wavelet transform, and the embedded positions were determined by TD-ERCS chaotic map.Blind extraction was used to realize this watermarking scheme.The results show that the proposed algorithm keeps the quality of the image well and is robust enough for JPEG compression, noise, filtering, image enhancement, histogram equalization, cropping and rotation etc.Security keys are required to extract the watermark, and the space of security keys is large, which ensures the safety of the watermark.关键词
数字水印/小波变换/子采样/TD-ERCS/盲提取分类
信息技术与安全科学引用本文复制引用
孙克辉,包善琴..小波变换和子采样在彩色图像水印中的应用[J].中南大学学报（自然科学版）,2011,42(2):404-408,5.基金项目
国家自然科学基金资助项(60672041) （60672041）
