期刊论文

An Image Watermarking Algorithm Based on Error Propagation and Pixel Capacity Evaluation

中文

西南大学学报(自然科学版)

1673-9868

2017

39

10

109-118

10.13718/j.cnki.xdzk.2017.10.016

国家自然科学基金项目(61101235)； 湖南省教育厅科学研究项目(15C0486)；

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为了解决当前图像水印算法无法准确预测相邻像素间的误差值,不能根据像素的局部纹理特征差异来自适应确定其嵌入容量,导致复原水印信息存在较大失真以及水印容量较小的问题,本文提出了基于误差扩展与像素容量评估的无损图像水印算法.首先,设计动态混淆方法,对水印信息完成加密;再考虑3个相邻像素,引入边缘像素预测机制,准确预测载体图像的每个像素值,获取其对应的误差值;随后,利用载体图像中的任意3个相邻像素的方差,设计像素容量评估方法,对其水印容量完成评估;借助误差扩展技术,设计水印信息嵌入机制,根据像素容量评估结果,将不同容量的水印数据植入到载体图像的不同像素中,获取水印图像;最后...

In order to solve the defects of the current image watermarking algorithm, such as large distortion of restoration watermark information and small watermark capacity induced by not accurately predicting the error value between neighboring pixels,as well as not adaptively determining its embedding capacity according to the local texture characteristics of pixels, a lossless image watermarking algorithm based on error propagation and pixel capacity evaluation is proposed in this paper. Firstly, a dynamic confusion method is designed to encrypt the watermark information. Next, three adjacent pixe...