Binocular parallax

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the apparent difference in position of an object as seen separately by one eye, and then by the other, the head remaining unmoved.

See also: Parallax

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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The principle of binocular CCD ranging is based on the binocular parallax, which is to determine the pixel coordinates position of the same target images on the right and the left images and then calculate their pixel difference, also called binocular parallax, so as to obtain the target distance based on binocular CCD ranging model.
People see two different images--projections from the 2D monitor, one for each eye--based on "horizontal binocular parallax," namely what each horizontally separated eye sees.