Shadow Stereo–Locating Object Boundaries Using Shadows

Shadows are a useful source of information about object structure. Shadowscast under oblique lighting often indicate the location of the silhouette of an object. This paper describes a method for reliably detecting shadow edges corresponding to object edges. It is able to distinguish betweendetectededges due to shadows and those due to surface markings. The basis of the technique is to observe the differences in shadowsdue to changesin the direction of illumination. Analysis is further aided by a simple stereotechniquethat doesnot require a solution to the generalcorrespondenceproblem. Both the multi-light source and multi-camera methods can be implementedin an extremely efficient manner.

Authors

• William B. Thompson Michael T. Checky

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