DerivativeHistogram 1558 magick/segment.c     DerivativeHistogram(zero_crossing[i].histogram,derivative);
DerivativeHistogram 1559 magick/segment.c     DerivativeHistogram(derivative,second_derivative);
DerivativeHistogram 1570 magick/segment.c   DerivativeHistogram(zero_crossing[i].histogram,derivative);
DerivativeHistogram 1571 magick/segment.c   DerivativeHistogram(derivative,second_derivative);