selected coefficient meaning in English

选择系数

This paper is focused on images watermarking algorithms . watermark casting operates in frequency domain , embeds pseudo - random sequence of real number in selected coefficients without image degradation . a blind watermark retrieval technique that can detect the embedded watermark without resorting the original image is proposed , so that the proposed techniques represents a major improvements to those relying on the comparison between the watermarked and original image , which is not practical for a huge image database
本文主要研究针对图像水印系统的算法研究，采用伪随机序列作为水印信号，利用变换域系数作为水印的载体，在不降低图像质量的前提下达到嵌入水印的目的，在恢复水印的过程中无需原始图像的参与，相比较那些需要利用原始图像恢复数据的系统，文中所提出的方案更具有实用性。