文档介绍：Meylan et al. Vol. 24, No. 9/September 2007/J. Opt. Soc. Am. A 2807
Model of retinal local adaptation for the tone
mapping of color filter array images
Laurence Meylan,1,* David Alleysson,2 and Sabine Süsstrunk1
1School puter munication Sciences, Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland
2Psychology and NeuroCognition Laboratory, CNRS UMR 5105, Université Pierre-Mendes France (UPMF),
Grenoble, France
*Corresponding author: @
Received January 24, 2007; revised April 20, 2007; accepted April 23, 2007;
posted April 30, 2007 (Doc. ID 79299); published August 8, 2007
We present a tone mapping algorithm that is derived from a model of retinal processing. Our approach has two
major improvements over existing methods. First, tone mapping is applied directly on the mosaic image cap-
tured by the sensor, analogous to the human visual system that applies a nonlinearity to the chromatic re-
sponses captured by the cone mosaic. This reduces the number of necessary operations by a factor 3. Second,
we introduce a variation of the center/surround class of local tone mapping algorithms, which are known to
increase the local contrast of images but tend to create artifacts. Our method gives a good improvement in
contrast while avoiding halos and maintaining good global appearance. Like traditional center/surround algo-
rithms, ou