ZeroCrossHistogram 200 magick/segment.c ZeroCrossHistogram(MagickRealType *,const MagickRealType,short *); ZeroCrossHistogram 1560 magick/segment.c ZeroCrossHistogram(second_derivative,smooth_threshold, ZeroCrossHistogram 1572 magick/segment.c ZeroCrossHistogram(second_derivative,smooth_threshold,