DerivativeHistogram 1577 magick/segment.c     DerivativeHistogram(zero_crossing[i].histogram,derivative);
DerivativeHistogram 1578 magick/segment.c     DerivativeHistogram(derivative,second_derivative);
DerivativeHistogram 1589 magick/segment.c   DerivativeHistogram(zero_crossing[i].histogram,derivative);
DerivativeHistogram 1590 magick/segment.c   DerivativeHistogram(derivative,second_derivative);