An Improved Scalar Costa Scheme Based on Watson Perceptual Model  

作　　者：齐开悦 陈剑波 周异 

机构地区：[1]Department of Electronic Engineering, Shanghai Jiaotong University [2]School of Information Security, Shanghai Jiaotong University, Shanghai 200030, China

出　　处：《Journal of Shanghai Jiaotong university(Science)》2008年第1期26-29,共4页上海交通大学学报（英文版）

基　　金：The National Basic Research Program (973) of China (No. 2005CB321804)

摘　　要：An improved scalar Costa scheme (SCS) was proposed by using improved Watson perceptual model to adaptively decide quantization step size and scaling factor. The improved scheme equals to embed hiding data based on an actual image. In order to withstand amplitude scaling attack, the Watson perceptual model was redefined, and the improved scheme using the new definition can insure quantization step size in decoder that is proportional to amplitude scaling attack factor. The performance of the improved scheme outperforms that of SCS with fixed quantization step size. The improved scheme combines information theory and visual model.An improved scalar Costa scheme （SCS） was proposed by using improved Watson perceptual model to adaptively decide quantization step size and scaling factor. The improved scheme equals to embed hiding data based on an actual image. In order to withstand amplitude scaling attack, the Watson perceptual model was redefined, and the improved scheme using the new definition can insure quantization step size in decoder that is proportional to amplitude scaling attack factor. The performance of the improved scheme outperforms that of SCS with fixed quantization step size. The improved scheme combines information theory and visual model.

关 键 词：information hiding scalar costa scheme perceptual model quantization step size 

分 类 号：TN919.81[电子电信—通信与信息系统]