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);