ZeroCrossHistogram  200 magick/segment.c   ZeroCrossHistogram(MagickRealType *,const MagickRealType,short *);
ZeroCrossHistogram 1579 magick/segment.c     ZeroCrossHistogram(second_derivative,smooth_threshold,
ZeroCrossHistogram 1591 magick/segment.c   ZeroCrossHistogram(second_derivative,smooth_threshold,