Human visual system model: Difference between revisions

Revision as of 02:04, 6 October 2008

Revision as of 03:11, 6 October 2008

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A '''human visual system model''' (HVS model) is used by [[image processing]], [[video processing]] and [[computer vision]] experts to deal with biological and psychological processes that are not yet fully understood. Such a model is used to simplify the behaviours of what is a very complex system. As our knowledge of the true [[visual system]] improves, the model is updated.

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* Texture stronger that disparity - 3D depth resolution does not need to be so accurate

* Integral Face recognition (babies smile at faces)

** [[Hollow-face illusion | Depth inverted face looks normal]] (facial features overrule depth information)

*** Upside down face with inverted mouth and eyes looks normal<ref>[http://www.moillusions.com/2006/09/margaret-thatcher-illusion.html Margaret Thatcher Illusion - Mighty Optical Illusions<!-- Bot generated title -->]</ref>

==Examples of taking advantage of an HVS model==

* [[Flicker fusion threshold | Flicker frequency of film and television using persistence of vision to fool viewer into seeing a continuous image]]

* [[Interlacing | Interlaced television]] painting half images to give the impression of a higher flicker frequency

* Colour television (chrominance at half resolution of luminance corresponding to proportions of rods and cones in eye)

* Image compression (difficult to see higher frequencies more harshly quantised)