Theories related to watermark are introduced in detail, including communication model, related detection model, hiding information capacity analysis and security of steganography.
从水印的通信模型建立，水印的相关检测模型，到信息隐藏容量分析，隐写术的安全性理论，详细介绍了水印的相关理论；
The pixel-value differencing (PVD) steganography has the superiority of high capacity and good imperceptibility, but the original PVD method is vulnerable to histogram analysis.
像素差值）隐写算法具有嵌入容量高和不可见性好的优点。
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