Simulated Human Vision..... Ian Overington

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

Optical Flow

It is difficult to make experimental measurements concerning the absolute thresholds of the human visual system to optical flow. It is, however, readily obvious in everyday life that our vision is acutely sensitive to even very slight local movements.


It has been concluded, by collection of a wide range of data, that the sensitivity of human vision to slight local movement is equivalent to something of the order of 0.05 sampling intervals (or ‘pixels’).

Additionally, a little thought permits realisation that, in everyday viewing, we are continually moving the entire visual image in jumps across our eyes’ retinas. Hence we are continually carrying out whole field matching (fusion) at the perceptual level. It can be demonstrated using SHV that even this process can be relatively trivial!