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....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.展开更多
本课题研究实现的数字图像可见水印系统是基于.NET的平台开发,在Visual Studio 2008环境下结合数字图像处理技术、数字水印原理和GDI+绘画技术设计完成,可为用户提供文字型水印、图像型水印、个性化涂鸦型水印以及可逆水印等功能,并支...本课题研究实现的数字图像可见水印系统是基于.NET的平台开发,在Visual Studio 2008环境下结合数字图像处理技术、数字水印原理和GDI+绘画技术设计完成,可为用户提供文字型水印、图像型水印、个性化涂鸦型水印以及可逆水印等功能,并支持批量处理、模板设置和预览功能。展开更多
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) .
文摘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.
