DerivativeHistogram 1377 magick/segment.c       DerivativeHistogram(zero_crossing[i].histogram,derivative);
DerivativeHistogram 1378 magick/segment.c       DerivativeHistogram(derivative,second_derivative);
DerivativeHistogram 1389 magick/segment.c   DerivativeHistogram(zero_crossing[i].histogram,derivative);
DerivativeHistogram 1390 magick/segment.c   DerivativeHistogram(derivative,second_derivative);