FD sketch

According to Marr (1982), various stages are involved in the transformation of the primal sketch into the 2j-D sketch. The first stage involves the construction of a range map ("local pointby-point depth information about surfaces in the scene", Frisby, 1986, p. 164). After this, higher-level descriptions (e.g., of convex and concave junctions between two or more surfaces) are produced by combining information from related parts of the range man. More is known of the processes involved in constructing a range map than in proceeding from that to the 2y-D sketch itself.

What kinds of information are used in changing the primal sketch into the 2j-D sketch? Use is made of shading, motion, texture, shape, and binocular disparity (see Chapter 2).

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