Biomedical Engineering Reference
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further interprets the information received as colours and generates sensations in
response to that information. The camera device receives the energy in a similar
manner, through pixels located on an optical electronic chip. The human percep-
tion carries visual information from the eye to the visual cortex of the brain, where
the experience of colour is made conscious and human emotions, associations, and
memory are generated. This process is related to our earlier experience and makes
us in some sense also unique, since each and every individual have their own
experience that influence what they perceive. In the artificial camera vision sys-
tem there is a similar process of data collection, handling and analysis that has to
be taken care of before presenting a picture on a screen.
Also, the human stereo color vision is a very complex process that is not com-
pletely understood, despite centuries of intense study and investigation. A com-
plex vision process involves the paralell interaction of the two eyes and the brain
through a network of neurons. The proceess of communicating colours to the
brain, and the degree of subjective involvements needed when reconstructing the
visual view is a complex process. The human perceptual sensing has restrictions
in detecting colours and nyances, e.g., when it is getting dark, and is still not fully
understood. Thus, there is no reason to doubt that there may exist other colours
which humans are not able to detect and identify. However, if the human capacity
isrestrictedandwearenotabletoexperiencevisualsensationoutofourvisual
Figure 2.5. The electromagnetic spectrum also known as the visible light spectrum. Image
source: http://commons.wikimedia.org/wiki/File:Electromagnetic-Spectrum.png.
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