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基于颜色恒常性的低照度图像视见度增强

DOI: 10.3724/SP.J.1004.2011.00923, PP. 923-931

Keywords: 颜色恒常性,视见度增强,白平衡,Retinex,人眼视觉系统

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Abstract:

?在彩色成像过程中,低照度是导致图像降质的一个重要因素.本文提出了一种新的基于颜色恒常性的低照度图像视见度增强算法.为了避免场景光源的影响,提出了像素有效集的概念.基于灰色调算法的灰度像素假设,利用有效像素估计光照的颜色;在后处理阶段,利用有效像素的灰度级范围确定直方图剪裁的上下限.实验表明,算法有效地校正了图像的颜色、对比度和亮度,从而增强了图像的视见度,且不会产生Retinex算法所固有的灰化效应和Halo效应.

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