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Summary: Image reconstruction in a color mosaic with random arrangement of chromatic samples
David Alleysson1
1
Laboratoire de psychologie et NeuroCognition, CNRS UMR 5105, Grenoble, France
Recent high resolution imaging of the retina (Roorda et al., 1999) shows that the mosaic of
cones follows a random arrangement. Moreover, arrangement and proportion of cones differs
largely from individual to individual. These finding renew the understanding of color vision
because most of the model of color vision ignore the mosaic sampling. Here, we propose a
simulation of mosaic sampling applied on color image. From the simulation we can infer what
is the processing needs for retrieving spatial and chromatic information without ambiguity
from the mosaic. We show that it is possible to recover, with a linear processing, spatial and
chromatic information from a mosaic of chromatic samples arranged randomly. We also show
that low frequency of achromatic information could serve for contour discrimination which
able improving the interpolation of chromatic information. As analogy to the mosaic of cone,
it may possible that in the cortex, the low frequency achromatic spatial information of the
magnocellular pathway helps the reconstruction of chromatic information coming from the
parvocellular information.
Roorda and Williams, Nature, 1999.
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