Nonhomogeneous resolution of images of natural scenes.
The aim of this research is to model and simulate the loss of visual resolution as a function of retinal eccentricity in the perception of natural scenes. The model of visual resolution is based on a space-variant low-pass filter, having a variable convolution kernel according to retinal eccentricity. The parameters of the model are computed from psychophysical measures of visual acuity as a function of retinal eccentricity. The implementation of the model allowed us to generate images of scenes with nonhomogeneous space-variant resolution, simulating the filtering executed by the eye. These scenes are used to test and optimise the model by means of experiments in static vision (through tachistoscopic presentations) and in dynamic vision where the resolution of the scene is computed, in real-time, as a function of the location of gaze.
LPE (CNRS), Laboratory of Experimental Psychology, University Pierre Mendès-France, BP 47, 38040 Grenoble cedex 9, France.
B
B
Séré
C
C
Marendaz
J
J
Hérault
D015350:Contrast Sensitivity / Q000502:physiology*; D004192:Discrimination, Psychological / Q000502:physiology; D005374:Filtration / Q000295:instrumentation; D006801:Humans; D008954:Models, Biological; D011601:Psychophysics; D012160:Retina / Q000502:physiology; D014792:Visual Acuity / Q000502:physiology*