一种基于人眼视觉感知模型的数字水印隐藏方法

水印是将身份确认信息或保密信息镶嵌于图像中的一种技术,可靠的水印会为信息的安全提供有力的保障.本文提出了一种隐藏数字水印的新方法,该方法将水印作为二值图像来处理,充分考虑了人眼视觉模型(HVS),并将其与图像的DCT变换相结合来选择位于中频区域的DCT系数,通过修改这些系数来隐藏水印图像.实验表明这种新方法可以很好地在降低原始图像变换后视觉失真和提取出的被隐藏水印图像的失真两方面都达到较好的效果.实验表明这是一种很有发展前景的新方法.

A Visual Model Weighted Cosine Transform for Hiding Watermark in Images

Watermarking is a technique for labeling digital pictures by hiding secret information into images.Watermark embedding is a method to discourage unauthorized copying or arrest the origin of the images. In this paper, a new method is proposed.The watermark is processed as a visually recognizable pattern—binary image,which includes more information than the traditional bit streams and is "extracted" instead of only "detected" to characterize the owner.The watermark is hid in the host image by selectively modifying the middle-frequency part of the host image in conjunction with the human visual model and the image cosine transform.Experiments show that this method can survive image cropping and image compression, and get better results, and this is also a prospective method.