Human Visual System. Understanding HVS, Why?. Image is to be SEEN! Perceptual Based Image Processing Focus on perceptually significant information Discard perceptually insignificant information. Human Eye Structure. Light passes through cornea, iris, lens and form image on retina.
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Distance between center of lens and retina (focal length) vary between 14-17 mm.
When object is 3 m or more away, f = 17mm with lowest refractive power.
Image length h = 17(mm) x (15/100)Image formation
I vary between 14-17 mm.
I+ IWeber Ratio
Perceived Brightness changes around strong edges.
Threshold intensity increases at background with large non-uniform spatial, temporal changes.