大容量多通道数字水印算法

现有许多数字水印算法基本上都是针对灰度图像的，彩色图像数字水印算法尚未得到充分研究，且所能嵌入水印的容量也不够大。本文提出的大容量多通道数字水印算法对这一问题进行了研究。该算法以彩色图像作为原始载体，通过数字水印压缩编码，载体图像颜色空间转换，彩色分量分块离散余弦变换，结合人眼视觉系统确定水印嵌入位置等措施，将二维水印图像嵌入到原始彩色载体图像中，且能嵌入较大容量的水印图像。实验结果表明，该算法不仅提高了水印容量，且对剪切、模糊、锐化等有损攻击具有良好的健壮性。

High-capacity and multi-channel digital watermarking algorithm

Many digital watermarking algorithms are aimed at gray image and digital watermarking algorithms. Color - image watermarking algorithm has not been researched sufficiently at present, and the capacity of the embedded watermark image is not large enough. A high - capacity and multi - channel digital watermarking algorithm is presented in this paper. In this algorithm, a color image is used as original carrier image, through such processing as compression coding of the digital watermarking, color space transforming of carrier image, DCT transforming of muhicolor components, ascertaining the watermark position according to HVS and so on, the planar high - capacity watermark image can be embedded in color carrier image. Experiments show that this algorithm can not only increase the capacity of watermark but has robustness to such attack of cutting, blurring, sharpening etc.