摘要
为了实现对图像置乱程度的评价,提出了基于DCT(Discrete Cosine Transform)域的数字纹理图像置乱度评价方法。该方法先对图像进行DCT变换,提取DCT系数的大小和分布特征,作为评价图像的置乱程度,再结合DCT利用图像的纹理特征,给出了图像置乱度评价公式,并对图像置乱方法进行了分析和评价。利用图像进行仿真测试的结果表明,与传统的Arnold变换方法比较,置乱程度提高了2倍左右。
In the context of information hiding and digital watermarking, it is very important to evaluate the image scrambling degree. A new method for evaluating digital texture image scrambling degree is proposed based on DCT （Discrete Cosine Transform） Domain by image texture character to realize evaluation for the image scrambling degree. The value and distribution characters of the image DCT coefficients are used for evaluation of the scrambling degree. A new evaluation formula is proposed and analyzed. Simulated experiment is done by testing image. Results show that using the proposed method compared to traditional Arnold transform method, the image scrambling degree is improved 2 times.
出处
《吉林大学学报（信息科学版）》
CAS
2008年第1期27-30,共4页
Journal of Jilin University（Information Science Edition）
基金
国家自然科学基金(60672082)
关键词
置乱变换
离散余弦变换
信息隐藏
数字水印
image scrambling degree
discrete cosine transform （DCT）
information hiding
digital watermarking
