histogram_sub    1996 modules/imgproc/src/smooth.cpp                                 histogram_sub( &h_fine[16*(n*(16*c+k)+MAX(luc[c][k]-2*r-1,0))], H[c].fine[k] );
histogram_sub    2001 modules/imgproc/src/smooth.cpp                         histogram_sub( &h_coarse[16*(n*c+MAX(j-r,0))], H[c].coarse );