Image Understanding

33-D Shape Information Recovery

Stereo vision introduced in the previous chapter requires determining which point in one image corresponds to a given point in the other image. This is often a difficult problem in real situation. To avoid this problem, various techniques using different 3-D cues for information recovery based on a single camera (position is fixed but several images may be taken) are proposed, Pizlo (1992). Among the intrinsic properties of scene, the shape of a 3-D object is the most important. Using a single camera to recover the 3-D shape information is often called “shape from X,” in which X can represent the illumination change, shading, contour, texture, motion, and so on. Some early important work in this kind was conducted ...