Abstract: To solve those problems that are embedding watermark into color image, the low robustness of special watermark and the design of public watermark, this paper proposes a special public watermarking of color image. Watermarks are embedded into the blue channels of pixels. Through modulating the distribution of block average over a mapping range,a new stable image character is builded,watermarks are embedded and blind-detect is implemented. The max precision of modulating range and the influence of mapping range length on algorithm robustness is discussed. Experimental results show that the proposed technique has good robustness to common image processing operators.

Key words: blind-detect, public watermarking, modulating range, modulating block average, mapping range

摘要： 为了解决彩色图像的水印嵌入、空间域水印的低稳健性和公开水印的设计等问题，提出一种新的空间域公开水印技术。该技术将水印嵌入到视觉不太敏感的蓝色通道中，通过调制图像子块均值在映射区间上的分布，构建新的图像稳定特征，并实现水印的嵌入和盲检测。讨论了调制区间的最大精度以及映射区间长度对算法稳健性的影响。实验结果表明本文方法对多种图像处理具有稳健性。

关键词: 盲检测, 公开水印技术, 调制区间, 块均值调制, 映射区间