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,