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Title : Three Stages of Vision
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Three Stages of Vision

Vision doesn't occur passively, as it does with a camera. It's active, constructive, and largely unconscious.

And it doesn't happen all at once. The light entering our eyes is translated and organized in stages, beginning with simple visual elements and proceeding to higher levels of interpretation.

For us to be able to see the flying white horses, our brain must segment the image and relegate the dark red shapes to the background, rather than vice versa. 

This kind of sorting normally happens unconsciously, but it's easy to consciously flip the image. Identifying the image as a mythological flying horse by M.C. Escher is the last and highest stage in image processing, involving several areas of the brain.

Eric R. Kandel et al., authors of a textbook on the Principles of Neural Science, put it this way:

"The brain analyzes a visual scene at three levels: low, intermediate, and high. At the lowest level, visual attributes such as local contrast, orientation, color, and movement are discriminated. The intermediate level involves analysis of the layout of scenes and of surface properties, parsing the visual image into surfaces and global contours, and distinguishing foreground from background. The highest level involves object recognition. Once a scene has been parsed by the brain and objects recognized, the objects can be matched with memories of shapes and their associated meanings."

Book: Principles of Neural Science by E.R. Kandel, et al.

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