random permutation meaning in English
随机置换
Examples
- Random group and random permutation of idea
的随机群和随机置换 - Since watermark is added to visually more important regions of host image according to human visual system , and a pseudo - random permutation is performed in the wavelet domain before the watermark is embedded , which disperse the spatial relationship of pattern . therefore , even if the shape or the major location of the watermark is estimated , it ' s extremely difficult to detect or destroy the watermark with the cipher of permutation unknown
由于利用人眼视觉系统把数字水印嵌入到图像视觉较重要区域中，并且水印在嵌入前进行了小波域上的伪随机置乱，打乱了水印的空间关系，因此在置乱密钥未知的情况下，即使能估计出水印的形状和嵌入的主要位置，对水印的检测和破坏也是非常困难的。 - The watermarking scheme based on wavelet decomposition and discrete cosine transform using a binary pattern or gray - level pattern as the watermark , the scheme initially performs wavelet decomposition of the host image and the watermark with different hierarchy . after the pseudo - random permutation , each decomposed layer of the watermark is embedded into the dct domain of corresponding decomposed layer of the host image
基于小波分解和余弦变换结合的水印方案算法以二值图标或灰度图标作为水印，将原图像和水印信号分别进行不同层次的小波分解，分解后的水印各分量伪随机置乱后分别嵌入到原图像相应分解层各分量的dct域中。