Algorithm Boundary tracing

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for example digital region boundary point depicted in red starting point boundary tracing algorithm since point / 0-cell first foreground pixel located along row major order search.




the direction assignments given various crack orientations create means of coding set of boundary points.


once pixel located algorithm may begin tracing cracks of region in counterclockwise fashion following 1 of 4 possible directions @ each step. these directions represented crack code sequence: 0 (east), 1 (south), 2 (west), 3 (north)







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