一种基于脆弱水印的图像认证算法

Yuning Hua, A-na Wang, Bo Wu
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引用次数: 6

摘要

提出了将离散小波变换与阿诺德变换相结合的算法,通过嵌入脆弱水印实现彩色图像内容的完整性认证。首先,利用原始二值水印与经过阿诺德变换处理的图像之间的异或,生成新的水印图像;水印嵌入时,首先对原始图像进行颜色变换,然后将亮度分量分解为三个离散小波。然后提取三阶低频近似子图像,将其最低有效位设为0;最后,将新水印嵌入到最小有效位中。通过将原始水印图像的像素与提取的水印图像的像素进行比较,可以判断水印图像是否被篡改,并定位原始彩色图像的篡改区域。仿真实验结果表明,该算法具有较强的检测和定位能力,并能很好地保持原始图像的质量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An Algorithm for Image Authentication Based on Fragile Watermarking
The algorithm of discrete wavelet transform and Arnold transform combined is developed to achieve the integrity authentication of color image contents through embedding fragile watermarking. Firstly, a new watermarking image is generated with the XOR between the original binary watermarking and the image which is processed with Arnold transform. When the watermark is embedded, the original image color is converted first and the brightness component is decomposed into three discrete wavelets. Then, the low-frequency approximation sub-image of third-level is extracted, and its least significant bit is set 0. Finally, the new watermark is embedded into its least significant bit. Through comparing the pixels of original watermarking image with that of the extracted watermarking image, it can be determined whether the watermarking image has been tampered, and the tampered area of the original color image is located. The results of simulation experiment shows that the algorithm has the strong capabilities of detection and location and it also can keep the original image quality well.
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