Abstract

A computer-simulated retina (called iris) is described which has useful features for computer vision. iris discriminates small differences in reflected light when these differences occur in a restricted domain of space and time, and maintains sensitivity to these differences for a wide range of lighting environments. As prevailing light levels decrease and photon noise becomes significant, iris reduces its spatiotemporal resolution to provide greater redundancy. Electrically, iris could be implemented by 2-D lattice of photosensors attached to a passively conducting grid. In the present study, the model is implemented in fortran. Similarities to the human retina are noted; the photosensor design is based on a photoreceptor model, and each conducting grid may be realized by tight-junction coupling of receptors and by horizontal-cell interconnections (effectively forming a syncytium).

© 1987 Optical Society of America

Retinal noise, the performance of retinal ganglion cells, and visual sensitivity in the dark-adapted frog

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