Exercise 24.4

Edges in an image can correspond to a variety of events in a scene. Consider Figure illuminationfigure (page illuminationfigure), and assume that it is a picture of a real three-dimensional scene. Identify ten different brightness edges in the image, and for each, state whether it corresponds to a discontinuity in (a) depth, (b) surface orientation, (c) reflectance, or (d) illumination.

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