secondly, a quantization matrix related to image's gray value is corrected utilizing the visual masking in dct domain, making the watermark adaptively embed into the least sensitive part;
在嵌入算法中利用dct域的视觉掩盖特性,修正了一个与图像灰度值有关的量化矩阵,使得水印自适应地嵌入到原始图像中人眼较为不敏感的部分;