Visible Watermarking Technique for MPEG-2 Downsampling Transcoding in the DCT Domain  

作　　者：DU Yao-gang CAI An-ni 

机构地区：[1]Telecommnication Engineering School, Beijing University of Posts and Telecommunications, Beijing 100876, P.R. China [2]Foundation Department, Beijing Institute of Electronic Science and Technology, Beijing 100070, P.R. China

出　　处：《The Journal of China Universities of Posts and Telecommunications》2005年第2期55-58,75,共5页中国邮电高校学报（英文版）

基　　金：This work is supported by National Natural Science Foundation of China(60462001) , and Beijing Institute of Electronic Science and Technology&Information Security and Privacy key Laboratory (YZDJ0416) .

摘　　要：To locate the right places for embedding watermark signals, and to set the proper streng-th of the embedded watermark signal are two critical problems for obtaining a robust and transpar-ent watermark in color images. In this paper, a DCT domain visible watermarking scheme based on the luminance and texture features and alligned with transcoding from MPEG-2 to MPEG-1 is proposed. In this scheme, the location of the visible watermark is chosen at the block with minimum number of nonzero DCT coefficients in the I-frames. When embedding the visible watermark （ such as video DC image ） into the unmarked original image, the embedding factors are determined with the local luminance feature and texture features of the original image and watemark image by utilizing DC and 3AC coefficients only. Experimental results demonstrate that the proposed scheme not only provides good fidelity and robustness against MPEG-2 downscaling transcoding, but also achieves a low Computational complexity.To locate the right places for embedding watermark signals, and to set the proper streng-th of the embedded watermark signal are two critical problems for obtaining a robust and transpar-ent watermark in color images. In this paper, a DCT domain visible watermarking scheme based on the luminance and texture features and alligned with transcoding from MPEG-2 to MPEG-1 is proposed. In this scheme, the location of the visible watermark is chosen at the block with minimum number of nonzero DCT coefficients in the I-frames. When embedding the visible watermark （ such as video DC image ） into the unmarked original image, the embedding factors are determined with the local luminance feature and texture features of the original image and watemark image by utilizing DC and 3AC coefficients only. Experimental results demonstrate that the proposed scheme not only provides good fidelity and robustness against MPEG-2 downscaling transcoding, but also achieves a low Computational complexity.

关 键 词：visible watermarking downsampling transcoding computational complexity 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]