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edgels

Arguments:

• x0,y0,_n0,_is_high_connectivity={ 0 | 1 }

Description:

Extract one or several lists of edgels (and their normals) that defines a 2D binary silhouette.

When specified (i.e. !=-1), arguments x0,y0,n0 are the coordinates of the starting edgel, which must be located on an edge of the binary silhouette.
A list of edgels is returned as an image with 3 channels [x,y,n] where x and y are the 2D coordinates of the edgel pixel, and n is the orientation of its associated canonical normal (which can be { 0:[1,0] | 1:[0,1] | 2:[-1,0] | 3:[0,-1] }.

Default values:

x0=y0=n0=-1 and is_high_connectivity=1.