标题：HVS-based imperceptibility evaluation of watermark in watermarked gray image
作者：Yang, Hong-Mei ;Liang, Yong-Quan ;Wei, Wen-Xue ;Wang, Xiao-Dong
作者机构：[Yang, Hong-Mei ;Liang, Yong-Quan ;Wei, Wen-Xue ] College of Information Science and Engineering, Shandong University of Science and Technology, Qingd 更多
来源：Tongxin Xuebao/Journal on Communications
摘要：The imperceptibility of the watermark is one of the most important aspects for the performance of the watermarking algorithm. Conventional measure of image quality PSNR can't evaluate the quality of watermarked image well. The different background luminance, texture and the frequency of the image mask the human eyes differently. This characteristic can be used to improve the conventional measure PSNR. By calculating the masking threshold of the background luminance, the texture and the frequency of each pixel, the masking-weight is calculated and an improved quality measure with these weights is obtained, which is written as MPSNR (Masking-based Peak Signal to Noise Ratio). The conventional measure and the new one are compared through different experiments. The quality of image judged by the new measure is more close to the result judged by human eyes than the conventional measure. And the new one can be used to evaluate the imperceptibility of the watermarking algorithms.