Two-Dimensional Measurements (Part 2)

Chapter 3 summarizes shape descriptors that attempt to extract just a few numbers that may be used to characterize, and perhaps to compare or match, various shapes. One of the common threads in all of those parameters is their incompleteness. There are infinitely many visually different shapes that produce identical values for formfactor, or fractal dimension, or the number of loops in the skeleton. This chapter instead deals with shape descriptors that are complete, that is, they contain enough information to fully reconstitute the original shape and are therefore unique.

Although these descriptors are generally somewhat more compact than the pixel array they describe, they are not small. The problem ...

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