小波和余弦变换相结合的灰度图像水印算法

李智; 陈孝威

doi:10.11834/jig.200606140

学术论文与技术报告 | 浏览量 : 0 下载量: 318 CSCD: 0

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专辑

小波和余弦变换相结合的灰度图像水印算法
Public Watermarking Algorithm of Gray-level Still Images Combining DWT and DCT
2006年11卷第6期页码：834
纸质出版：2006
DOI： 10.11834/jig.200606140
稿件说明：

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李智, 陈孝威. 小波和余弦变换相结合的灰度图像水印算法[J]. 中国图象图形学报, 2006,11(6):834. DOI： 10.11834/jig.200606140.

Public Watermarking Algorithm of Gray-level Still Images Combining DWT and DCT[J]. Journal of Image and Graphics, 2006, 11(6): 834. DOI： 10.11834/jig.200606140.

摘要

在充分考虑人类视觉系统掩蔽特性的基础上

首先给出基于图像分块的临界噪声阈值矩阵JND（justnoticeable difference）

进而提出了一种结合离散小波变换（DWT）和离散余弦变换（DCT）域的采用灰度图像作为水印的具有较好鲁棒性的公开水印技术.实验结果表明

该算法对常见图像处理操作、有损压缩和裁剪、挤压、像素移位等几何变换有较好的鲁棒性

特别是信号增强操作处理几乎不影响水印的正确提取.

Abstract

This paper is based on taking the masking characteristics of the human visual system into account.First

we give the method that can calculate the just noticeable difference(JND) matrix.Secondly

we propose a public watermarking of gray-level still images combining DWT and DCT.The results of experiment indicate that this watermarking scheme is much robust against noise interference

some geometric distortions and commonly used image processing techniques

especially the signal enhanced processing almost can not affect the correct extraction of watermark.