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The reason that the model from Pdollar github doesn't work is the sharpen parameter. You can try either setting the sharpen parameter to 0 and then retrain a new model based on BSDS or whatever data set you like or you can try correct the following lines in OPENCV structured_edge_detection.cpp source file:

int start = __rf.edgeBoundaries[currentNode * (__rf.edgeBoundaries.size() - 1) / (nTreesNodes * nTrees)]; int finish = __rf.edgeBoundaries[currentNode * (__rf.edgeBoundaries.size() - 1) / (nTreesNodes * nTrees) + 1];

(or you better keep the the multiple factor at a side variable such as: const int nBnds = (__rf.edgeBoundaries.size() - 1) / (nTreesNodes * nTrees)

Cheers, Ohad