INRIA developed a new image description called a "Natural Interest Ridge", which is scale invariant descriptor of elongated shape, based on maxima in a Laplacian Scale Space.
The human form can often be represented by three dominant ridges based on the spine and 2 legs. This ridge configuration is useful for evaluating whether a detected target region contains a person or is a noise region.
Several examples of Natural Interest Ridges are:
A paper that describes the process is:
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