Visual Surveillance Chip

1. Visual Change Detection2. Photoreceptors and change detection3. superior colliculus / optic tectum

Visual Surveillance Chip

Yarbus

Our eyes generallymove to gatherinformation that weseek, but very oftenour eyes move tolook at suddenchanges inthe environment.

Our retina is not simply a layer of photoreceptors of a single type, rather receptors varyIn their sensitivity to different: spatial scales, spatial frequencies, intensities, colors, and temporal frequencies.

Although much of our detailed visual processing occurs using the high resolution system ofthe fovea, our peripheral vision is driven by a coarse spatial system with high sensitivityto temporal change.

From "Merging of the Senses",Stein and Meredith, 1994

The superior colliculus (SC) is a subcortical region of the brain involved in producingrapid sensory orientation movements. The SC receives direct projections from the retinaand subserves reflexive eye movements to sudden changes in the visual environment.

retina

LGN

visual cortex

SC

eye musclecontrol areas

Chip Idea:

1. Using the adaptive photoreceptor design (provided), design a low-powersurveillance chip that will signal the location of visual change.

2. Design an adaptive threshold for each pixel to reject locations that have frequentmovement that is not of interest.