The embedding strength is decided by the just noticeable difference of the image, and the cover image is not needed during the extraction of watermark. 水印的嵌入强度由图像的视觉临界差异决定,水印的提取不需要载体图像。
Some new research methods in social skills such as the Just Noticeable Difference(JND) and Functional Analysis Approach also reviewed in the paper. 社会技能研究方法的研究主要包括对现有社会技能评定量表和测量方法的分析与评价以及对新的社会技能研究方法&最小可觉差法和功能分析法的特征分析和有效性评价。
A spread spectrum based watermarking algorithm is proposed based on Watson model, which calculate the just noticeable difference ( JND ) of sub-block image, then the frequency points insensitive to change are chosen and embedded to improve the robust. 论文利用Watson模型提出一种基于扩频的数字水印算法,该算法通过计算图像分块的恰可察觉差(JND)选择中对改变不敏感的频率点进行嵌入,提高了水印的鲁棒性。
In contrast to conventional JND ( Just Noticeable Difference(JND) ) threshold model, JPW describing minimum perceptual sensitivity weighting to noise changes, is fitter for nonadditive watermarking. 与传统的仅可见视差(JND)阈值模型相比,JPW刻画了对噪声变化的最小感知权重,它更适合于非添加型水印。
A Test on The Just Noticeable Difference(JND) of Noise Length 噪声时长差别阈限的实验