compute_NCfilter   67 modules/photo/src/npr.hpp         void compute_NCfilter(Mat &O, Mat &horiz, Mat &psketch, float radius);
compute_NCfilter  520 modules/photo/src/npr.hpp             compute_NCfilter(O, ct_H, temp,radius);
compute_NCfilter  524 modules/photo/src/npr.hpp             compute_NCfilter(O_t, vert_t, temp1, radius);