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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 10 — Oct. 31, 2007

Model of retinal local adaptation for the tone mapping of color filter array images

Laurence Meylan, David Alleysson, and Sabine Süsstrunk  »View Author Affiliations


JOSA A, Vol. 24, Issue 9, pp. 2807-2816 (2007)
http://dx.doi.org/10.1364/JOSAA.24.002807


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Abstract

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 captured by the sensor, analogous to the human visual system that applies a nonlinearity to the chromatic responses 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 algorithms, our method uses a weighted average of surrounding pixel values. Instead of being used directly, the weighted average serves as a variable in the Naka–Rushton equation, which models the photoreceptors’ nonlinearity. Our algorithm provides pleasing results on various images with different scene content and dynamic range.

© 2007 Optical Society of America

OCIS Codes
(100.2000) Image processing : Digital image processing
(100.2980) Image processing : Image enhancement
(110.5200) Imaging systems : Photography
(330.1690) Vision, color, and visual optics : Color
(330.4060) Vision, color, and visual optics : Vision modeling
(330.6110) Vision, color, and visual optics : Spatial filtering

ToC Category:
Image Processing

History
Original Manuscript: January 24, 2007
Revised Manuscript: April 20, 2007
Manuscript Accepted: April 23, 2007
Published: August 8, 2007

Virtual Issues
Vol. 2, Iss. 10 Virtual Journal for Biomedical Optics

Citation
Laurence Meylan, David Alleysson, and Sabine Süsstrunk, "Model of retinal local adaptation for the tone mapping of color filter array images," J. Opt. Soc. Am. A 24, 2807-2816 (2007)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=josaa-24-9-2807

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