Given two corresponding images taken with different lighting conditions, a unique solution can be obtained for the surface orientation at each point.
Example 3.4 Illustration of photometric stereo.
Two images of a sphere, taken with different lighting conditions (the same source has been put in two different position), are shown in Figure 3.12(a) and Figure 3.12(b), respectively. The surface orientation determined by photometric stereo is shown in Figure 3.12(c) by using an orientation-vector representation (the vector is represented by a line segment). It can be seen that the surface orientation is perpendicular to the paper in places closest ...
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