disparity

The horizontal pixel-position difference between a matched point's location in a rectified stereo pair.

Disparity is the difference in horizontal pixel position between a scene point's projections in a rectified stereo image pair (aligned so corresponding epipolar lines are horizontal). Disparity is inversely proportional to depth -- a nearby point shifts more between the two views than a distant one, letting disparity be converted directly into a depth estimate given the camera baseline.

Examples

A point 2 meters from a stereo rig shows much larger pixel disparity between the two camera views than a point 50 meters away.