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差别阈值法

于 2022-09-24 发布 文件大小:1.22 kB
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在第三步的后处理过程中,主要基于人类视觉的一些特性。人类视觉分为低照度下的暗视觉和正常照明下的明视觉以及中间视觉。在暗视觉条件下,人类视觉的对比度分辨率很低。因此,根据退化模型恢复出来的图像虽然对比度很高,细节比较丰富,但由于暗视觉条件下,没有达到人类视觉对比度分辨率的阈值,所以仍然不能被人类视觉感知。因此,需要通过增强图像的亮度,使图像适合人眼观察。人类视觉对比度分辨率阈值称为JND(Just-noticeable difference),定义为在一幅背景均匀的图像中,人的视觉系统所能感知的、均匀物体与背景之间的最小亮度差异。

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