...学期望；边缘信息；中值滤波；亚像素精度 [gap=1006]Key words: moments；mathematical expectations；marginal information；median filter；subpixel precision ...
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It detects the edge information of color printing registration image, calculates ECM of edge image, and extracts the peak value of ECM.
该算法检测彩色套印图像的边缘信息，在边缘图像中计算ECM，并提取ECM中的极值点。
参考来源 - 基于ECM的彩色套印偏差检测算法In this algorithm, the marginal information in DCT domain is used as original watermark, then is encrypted by chaos sequence and is embedded by replacing LSB bits on selected low frequency location in quatitative DCT coefficients.
该算法从DCT域提取边缘信息做为原始水印,经过混沌序列加密,在量化DCT系数的选定低频位置通过LSB位替换嵌入。
参考来源 - 基于数字水印的图像版权保护与认证技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
边缘信息是地物间波谱差异的反映。
Boundary information is the reflection of the spectral difference between objects.
为了在去噪声的同时更多地保留弱边缘信息，再次利用到循环平移的方法。
In order to retain the weak edge information while denoise, the circulation translation method is used again.
对不同压缩比的压缩结果进行了分析，比较了原始图象和解压图象的边缘信息。
Analyses compression results with different compression ratios, and compares the original images with the marginal information of decoded images.
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