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L'échantillonnage spatio-chromatique dans la rétine humaine et les caméras numériques

Abstract : It is now well established that the human color vision is allowed by the presence of three types of photoreceptors, sensitive respectively to the short, middle and long wavelengths of light. The presence of these three classes of samplers inducts a perceptive colour space of three dimensions. It is for instance possible to repoduce any colour using three basic colours, cal- led primary colours. Besides, psycho-physics experiments show that the human visual system builds three perceptive channels from the retinal image sampled by the cones. One conveys the achromatic information, called luminance, and the two others convey the colour oppositions red minus green and blue minus yellow.However, the visual system faces a dramatic problem since at each spatial position in the retina, only one sort of cone is present. Consequently, each cone measures both luminance and color information. The mecanism transforming this ambiguous retinal image into three disctinct channels is still not clear, especially when considering the random arrangement of the cones.We propose a model of estimation of the luminance and colour opposition channels. This models applies to any spatial arrangement of the photoreceptors. We also discuss its implica- tions for the retinal processing of colour. This model also applies, in an effective manner, to single-sensor cameras, which are confronted to the same spatio-chromatic sampling issue.
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https://tel.archives-ouvertes.fr/tel-00276483
Contributor : Brice Chaix de Lavarène <>
Submitted on : Wednesday, April 30, 2008 - 9:01:29 AM
Last modification on : Thursday, November 19, 2020 - 12:59:39 PM
Long-term archiving on: : Friday, November 25, 2016 - 10:06:30 PM

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  • HAL Id : tel-00276483, version 1

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Brice Chaix de Lavarène. L'échantillonnage spatio-chromatique dans la rétine humaine et les caméras numériques. Traitement du signal et de l'image [eess.SP]. Université Joseph-Fourier - Grenoble I, 2007. Français. ⟨tel-00276483⟩

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