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Simulated Human Vision..... Ian Overington

Location: Eastbourne. UK
ianoverington@simulatedvision.co.uk ............ www.simulatedvision.co.uk

Hierarchical
Structure

All the various partial difference signals from the two eyes are transmitted as temporal data streams along the optic nerves to the Optic Chiasma, where a mixing of the various data streams from the left & right eyes can take place. Beyond the Chiasma there then exist three groups of related data streams - one from each eye and one as the combination (or mean) of the two separate streams. Where the data streams from the two eyes are sufficiently close to being matched (better than perhaps +/-2 pixels for the highest resolution streams), this mixing provides the primary source of data for sensing relative close range stereo depth (up to a few feet) across the visual field (classical stereopsis). For lower resolution streams considerably greater mismatches (up to perhaps +/- 0.5 degrees angular subtense or about the perceived diameter of the sun or moon) are believed to provide initial rough corrections for the purposes of primary fusion and the basic mechanism for perception of stereo depth for distances greater than a few feet.

At this point, then, there exist a wide variety of partial difference data streams which provide for the potential awareness of a varied set of local discontinuities across the visual field - luminance, colour, motion, stereo depth. However, these varied data streams at this point all lack one essential component necessary for many forms of high fidelity & intelligent analysis - a measure of the local orientation of spatial discontinuities.

The Optic Chiasma.