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一种基于视锥适应模型的真实影像再现方法

DOI: 10.11834/jig.20070703

Keywords: Naka-Rushton方程,动态范围压缩,色调再现,光晕效应,白化现象

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Abstract:

鉴于常见的色调再现算法或者参数过多,或者空间常数过大,使其工程应用受到限制,为此,提出了一种基于视锥细胞适应模型的影像再现算法。在该模型中,视锥细胞转换函数的半饱和常数随着输入强度的变化而变化,而半饱和常数与其色素半漂白常数的相对比例关系保持不变,以便符合色素漂白与神经反馈对视锥适应的相对作用关系。通过大量实验仿真,并与其他方法处理结果的比较发现,该模型具有以下特点:①能够有效突出图像亮区和暗区的细节,且动态范围压缩性能较好;②能够在很大程度上减弱色调再现领域经常出现的“光晕”效应;③能够避免retinex模型和对抗神经网络等模型带来的“白化”现象;④处理结果的色调偏离真实景物的程度较低,其颜色恒定性能较好;⑤在计算背景光强时由于所用模板尺寸很小,因而速度远远快于常见的算法。该方法有希望应用到实时性要求较高的工程领域。

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