Publications by authors named "Jean Le Rohellec"
Domain of metamers exciting intrinsically photosensitive retinal ganglion cells (ipRGCs) and rods.
J Opt Soc Am A Opt Image Sci Vis
February 2012
Article Synopsis
- Any stimulus consists of a fundamental color component that affects cone responses and a metameric black component that doesn't impact cones but can influence other photoreceptors like rods and ipRGCs.
- The Cohen and Kappauf method is adapted to determine the black metamer basis for certain band spectra using seven colored LEDs.
- Experiments show that when stimulation of ipRGCs and rods is minimal, pupil diameter increases, with an average increase of 12% observed in 14 participants.
In everyday life, the visual system is remarkably good at recognizing materials across a wide range of viewing conditions. This paper addresses the problem of identifying real samples of materials from appearance. Here, we consider gloss as an appearance attribute that could reveal certain information about object properties.
View Article and Find Full Text PDFThe effect of controlled photopigment excitations on pupil aperture.
Ophthalmic Physiol Opt
September 2010
In addition to rods and cones, the human retina contains melanopsin which has been identified recently in the body and dendrites of a few ganglion cells. The intrinsically photosensitive retinal ganglion cells (ipRGCs) are good candidates for controlling the tonic pupil aperture but their spectral sensitivity is close to those of rods and S-cones which are other candidates. Our study aims at identifying the stimulus for the pupil response when the luminance is constant and the spectrum of the light changes.
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