174     histogram[256];  member
877 static void DerivativeHistogram(const double *histogram,  in DerivativeHistogram()  argument
888   derivative[0]=(-1.5*histogram[0]+2.0*histogram[1]-0.5*histogram[2]);  in DerivativeHistogram()
889   derivative[n]=(0.5*histogram[n-2]-2.0*histogram[n-1]+1.5*histogram[n]);  in DerivativeHistogram()
894     derivative[i]=(histogram[i+1]-histogram[i-1])/2.0;  in DerivativeHistogram()
969     *histogram[MaxDimension],  in GetImageDynamicThreshold()  local
982     histogram[i]=(ssize_t *) AcquireQuantumMemory(256UL,sizeof(**histogram));  in GetImageDynamicThreshold()
983     extrema[i]=(short *) AcquireQuantumMemory(256UL,sizeof(**histogram));  in GetImageDynamicThreshold()
984     if ((histogram[i] == (ssize_t *) NULL) || (extrema[i] == (short *) NULL))  in GetImageDynamicThreshold()
989           histogram[i]=(ssize_t *) RelinquishMagickMemory(histogram[i]);  in GetImageDynamicThreshold()
999   InitializeHistogram(image,histogram,exception);  in GetImageDynamicThreshold()
1000   (void) OptimalTau(histogram[Red],Tau,0.2f,DeltaTau,  in GetImageDynamicThreshold()
1002   (void) OptimalTau(histogram[Green],Tau,0.2f,DeltaTau,  in GetImageDynamicThreshold()
1004   (void) OptimalTau(histogram[Blue],Tau,0.2f,DeltaTau,  in GetImageDynamicThreshold()
1192     histogram[i]=(ssize_t *) RelinquishMagickMemory(histogram[i]);  in GetImageDynamicThreshold()
1223 static void InitializeHistogram(const Image *image,ssize_t **histogram,  in InitializeHistogram()  argument
1241     histogram[Red][i]=0;  in InitializeHistogram()
1242     histogram[Green][i]=0;  in InitializeHistogram()
1243     histogram[Blue][i]=0;  in InitializeHistogram()
1252       histogram[Red][(ssize_t) ScaleQuantumToChar(GetPixelRed(image,p))]++;  in InitializeHistogram()
1253       histogram[Green][(ssize_t) ScaleQuantumToChar(GetPixelGreen(image,p))]++;  in InitializeHistogram()
1254       histogram[Blue][(ssize_t) ScaleQuantumToChar(GetPixelBlue(image,p))]++;  in InitializeHistogram()
1507 static double OptimalTau(const ssize_t *histogram,const double max_tau,  in OptimalTau()  argument
1573     ScaleSpace(histogram,tau,zero_crossing[i].histogram);  in OptimalTau()
1574     DerivativeHistogram(zero_crossing[i].histogram,derivative);  in OptimalTau()
1585     zero_crossing[i].histogram[j]=(double) histogram[j];  in OptimalTau()
1586   DerivativeHistogram(zero_crossing[i].histogram,derivative);  in OptimalTau()
1648     value=zero_crossing[k].histogram[index];  in OptimalTau()
1653           if (zero_crossing[k].histogram[x] > value)  in OptimalTau()
1655               value=zero_crossing[k].histogram[x];  in OptimalTau()
1660         if (zero_crossing[k].histogram[x] < value)  in OptimalTau()
1662             value=zero_crossing[k].histogram[x];  in OptimalTau()
1716 static void ScaleSpace(const ssize_t *histogram,const double tau,  in ScaleSpace()  argument
1746       sum+=(double) histogram[u]*gamma[MagickAbsoluteValue(x-u)];  in ScaleSpace()
1812     *histogram[MaxDimension];  in SegmentImage()  local
1823     histogram[i]=(ssize_t *) AcquireQuantumMemory(256,sizeof(**histogram));  in SegmentImage()
1825     if ((histogram[i] == (ssize_t *) NULL) || (extrema[i] == (short *) NULL))  in SegmentImage()
1830           histogram[i]=(ssize_t *) RelinquishMagickMemory(histogram[i]);  in SegmentImage()
1841   InitializeHistogram(image,histogram,exception);  in SegmentImage()
1842   (void) OptimalTau(histogram[Red],Tau,0.2,DeltaTau,smooth_threshold == 0.0 ?  in SegmentImage()
1844   (void) OptimalTau(histogram[Green],Tau,0.2,DeltaTau,smooth_threshold == 0.0 ?  in SegmentImage()
1846   (void) OptimalTau(histogram[Blue],Tau,0.2,DeltaTau,smooth_threshold == 0.0 ?  in SegmentImage()
1860     histogram[i]=(ssize_t *) RelinquishMagickMemory(histogram[i]);  in SegmentImage()