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libshapefeatures.c
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/* Max-tree with a single attribute parameter and an optional template
* Attribute: I/(A^2) (default) and others (start program without arguments for
* a complete list of attributes available)
* Attributes here can use gray value information of the pixels used
* Decision: Min, Direct, Max, Subtractive, Nofilter (default)
* Input images: raw (P5) and plain (P2) PGM 8-bit gray-scale images
* Compilation: gcc ExtractFeatures.c -o Features -lm -lfreeimage
* Run: ./Features <input image> <attribute> [decision]
* decision use the default NOFilter ie 4
*/
#include <math.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <assert.h>
#define NUMLEVELS 128
#define CONNECTIVITY 4
#define PI 3.14159265358979323846
typedef short bool;
#define false 0
#define true 1
typedef unsigned char ubyte;
typedef unsigned int uint;
typedef unsigned long ulong;
#define MIN(a,b) ((a<=b) ? (a) : (b))
#define MAX(a,b) ((a>=b) ? (a) : (b))
#define NUMATTR 19
typedef struct ImageGray ImageGray;
struct ImageGray
{
ulong Width;
ulong Height;
unsigned char *Pixmap;
};
typedef struct HQueue
{
ulong *Pixels;
ulong Head;
ulong Tail; /* First free place in queue, or -1 when the queue is full */
} HQueue;
typedef struct MaxNode MaxNode;
struct MaxNode
{
ulong Parent;
ulong Area;
void *Attribute;
unsigned char Level;
unsigned char NewLevel; /* gray level after filtering */
};
/* Status stores the information of the pixel status: the pixel can be
* NotAnalyzed, InTheQueue or assigned to node k at level h. In this
* last case Status(p)=k. */
#define ST_NotAnalyzed -1
#define ST_InTheQueue -2
typedef struct MaxTree MaxTree;
struct MaxTree
{
long *Status;
ulong *NumPixelsBelowLevel;
ulong *NumNodesAtLevel; /* Number of nodes C^k_h at level h */
MaxNode *Nodes;
void *(*NewAuxData)(ulong, ulong, int, ulong *, ImageGray *);
void (*AddToAuxData)(void *, ulong, ulong, int, ulong *, ImageGray *);
void (*MergeAuxData)(void *, void *);
void (*DeleteAuxData)(void *);
};
void MaxTreeDelete(MaxTree *mt);
/****** Typedefs and functions for area attributes ******************************/
typedef struct AreaData
{
ulong Area;
} AreaData;
void *NewAreaData(ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
AreaData *areadata;
areadata = malloc(sizeof(AreaData));
areadata->Area = 1;
return(areadata);
} /* NewAreaData */
void DeleteAreaData(void *areaattr)
{
free(areaattr);
} /* DeleteAreaData */
void AddToAreaData(void *areaattr, ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
AreaData *areadata = areaattr;
areadata->Area ++;
} /* AddToAreaData */
void MergeAreaData(void *areaattr, void *childattr)
{
AreaData *areadata = areaattr;
AreaData *childdata = childattr;
areadata->Area += childdata->Area;
} /* MergeAreaData */
double AreaAttribute(void *areaattr)
{
AreaData *areadata = areaattr;
double area;
area = areadata->Area;
//printf("%3f\n",area);
return(area);
} /* AreaAttribute */
/****** Typedefs and functions for minimum enclosing rectangle attributes *******/
typedef struct EnclRectData
{
ulong MinX;
ulong MinY;
ulong MaxX;
ulong MaxY;
} EnclRectData;
void *NewEnclRectData(ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
EnclRectData *rectdata;
rectdata = malloc(sizeof(EnclRectData));
rectdata->MinX = rectdata->MaxX = x;
rectdata->MinY = rectdata->MaxY = y;
return(rectdata);
} /* NewEnclRectData */
void DeleteEnclRectData(void *rectattr)
{
free(rectattr);
} /* DeleteEnclRectData */
void AddToEnclRectData(void *rectattr, ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
EnclRectData *rectdata = rectattr;
rectdata->MinX = MIN(rectdata->MinX, x);
rectdata->MinY = MIN(rectdata->MinY, y);
rectdata->MaxX = MAX(rectdata->MaxX, x);
rectdata->MaxY = MAX(rectdata->MaxY, y);
} /* AddToEnclRectData */
void MergeEnclRectData(void *rectattr, void *childattr)
{
EnclRectData *rectdata = rectattr;
EnclRectData *childdata = childattr;
rectdata->MinX = MIN(rectdata->MinX, childdata->MinX);
rectdata->MinY = MIN(rectdata->MinY, childdata->MinY);
rectdata->MaxX = MAX(rectdata->MaxX, childdata->MaxX);
rectdata->MaxY = MAX(rectdata->MaxY, childdata->MaxY);
} /* MergeEnclRectData */
double EnclRectAreaAttribute(void *rectattr)
{
EnclRectData *rectdata = rectattr;
double area;
area = (rectdata->MaxX - rectdata->MinX + 1)
* (rectdata->MaxY - rectdata->MinY + 1);
return(area);
} /* EnclRectAreaAttribute */
double EnclRectDiagAttribute(void *rectattr)
/* Computes the square of the length of the diagonal */
{
EnclRectData *rectdata = rectattr;
double minx, miny, maxx, maxy, l;
minx = rectdata->MinX;
miny = rectdata->MinY;
maxx = rectdata->MaxX;
maxy = rectdata->MaxY;
l = (maxx-minx+1) * (maxx-minx+1)
+ (maxy-miny+1) * (maxy-miny+1);
return(l);
} /* EnclRectDiagAttribute */
/****** Typedefs and functions for cityblock (huge) perimeter attributes *********************/
typedef struct PeriCBData
{
ulong Area;
ulong Perimeter;
} PeriCBData;
void *NewPeriCBData(ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
PeriCBData *peridata;
ulong lx=x, ly=y, p, peri=0, q;
int i;
unsigned char h;
p = ly*(img->Width) + lx;
h = img->Pixmap[p];
peri += CONNECTIVITY-numneighbors;
for (i=0; i<numneighbors; i++)
{
q = neighbors[i];
if (img->Pixmap[q]<h) peri++;
if (img->Pixmap[q]>h) peri--;
}
peridata = malloc(sizeof(PeriCBData));
peridata->Area = 1;
peridata->Perimeter = peri;
return(peridata);
} /* NewPeriCBData */
void DeletePeriCBData(void *periattr)
{
free(periattr);
} /* DeletePeriCBData */
void AddToPeriCBData(void *periattr, ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
PeriCBData *peridata = periattr;
ulong lx=x, ly=y, p, peri=0, q;
int i;
unsigned char h;
p = ly*(img->Width) + lx;
h = img->Pixmap[p];
peri += CONNECTIVITY-numneighbors;
for (i=0; i<numneighbors; i++)
{
q = neighbors[i];
if (img->Pixmap[q]<h) peri++;
if (img->Pixmap[q]>h) peri--;
}
peridata->Area ++;
peridata->Perimeter += peri;
} /* AddToPeriCBData */
void MergePeriCBData(void *periattr, void *childattr)
{
PeriCBData *peridata = periattr;
PeriCBData *childdata = childattr;
peridata->Area += childdata->Area;
peridata->Perimeter += childdata->Perimeter;
} /* MergePeriCBData */
double PeriCBAreaAttribute(void *periattr)
{
PeriCBData *peridata = periattr;
double area;
area = peridata->Area;
return(area);
} /* PeriCBAreaAttribute */
double PeriCBPerimeterAttribute(void *periattr)
{
PeriCBData *peridata = periattr;
double peri;
peri = peridata->Perimeter;
return(peri);
} /* PeriCBPerimeterAttribute */
double PeriCBComplexityAttribute(void *periattr)
{
PeriCBData *peridata = periattr;
double area, peri;
area = peridata->Area;
peri = peridata->Perimeter;
return(peri/area);
} /* PeriCBComplexityAttribute */
double PeriCBSimplicityAttribute(void *periattr)
{
PeriCBData *peridata = periattr;
double area, peri;
area = peridata->Area;
peri = peridata->Perimeter;
return(area/peri);
} /* PeriCBSimplicityAttribute */
double PeriCBCompactnessAttribute(void *periattr)
{
PeriCBData *peridata = periattr;
double area, peri;
area = peridata->Area;
peri = peridata->Perimeter;
return((peri*peri)/(4.0*PI*area));
} /* PeriCBCompactnessAttribute */
int Get8NeighValues(ImageGray *img, ulong *neighbors, ulong x, ulong y)
{
ulong p;
int i;
p = y*(img->Width) + x;
for (i=0; i<8; i++) neighbors[i] = -1;
if (y>0)
{
neighbors[1] = img->Pixmap[p-(img->Width)];
if (x>0) neighbors[0] = img->Pixmap[p-(img->Width)-1];
if (x<(img->Width)-1) neighbors[2] = img->Pixmap[p-(img->Width)+1];
}
if (x<(img->Width)-1) neighbors[3] = img->Pixmap[p+1];
if (y<(img->Height)-1)
{
neighbors[5] = img->Pixmap[p+(img->Width)];
if (x>0) neighbors[6] = img->Pixmap[p+(img->Width)-1];
if (x<(img->Width)-1) neighbors[4] = img->Pixmap[p+(img->Width)+1];
}
if (x>0) neighbors[7] = img->Pixmap[p-1];
return(img->Pixmap[p]);
} /* Get8NeighValues */
/****** Typedefs and functions for large (8-conn.) perimeter attributes *********************/
typedef struct PeriLargeData
{
ulong Area;
double Perimeter;
} PeriLargeData;
double PeriLargeCalcSide(int h, int a, int b, int c, int d, int e)
{
double addarray[8] =
{
4.0, 4.0, 2.0, 2.0, 4.0, 2.0, 2.0, 2.7017787186
};
double l=0.0;
#define PeriLargeBit(v) ((v)>=(h) ? 1 : 0)
if ((b<h) && (c>h) && (e>=h)) l += sqrt(2.0) - 2.0;
if ((b<h) && (a>h) && (d>=h)) l += sqrt(2.0) - 2.0;
if (b>h)
{
if ((c<h) && (e>h)) l += sqrt(8.0) - 4.0;
else if ((a>h) && (d>h))
{
if ((c>h) && (e>h)) l -= sqrt(20.0)-sqrt(8.0);
else l -= sqrt(8.0);
}
if ((a<=h) && (c<=h)) l -= 2.0;
else if ((d<=h) && (e<=h)) l -= 2.0;
else if ((a<=h) && (e<=h)) l -= 2.0;
else if ((c<=h) && (d<=h)) l -= 2.0;
}
if (b>=h) return(l);
else
{
if (a<h)
{
if ((c>=h) && (e>=h)) return(l+sqrt(2.0));
return(l+2.0);
} else return(l+sqrt(addarray[(PeriLargeBit(c)<<2)+(PeriLargeBit(d)<<1)+PeriLargeBit(e)]));
}
} /* PeriLargeCalcSide */
void *NewPeriLargeData(ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
PeriLargeData *peridata;
double peri;
ulong neigh8[8];
unsigned char h;
h = Get8NeighValues(img, neigh8, x, y);
peri = 0.5*PeriLargeCalcSide(h, neigh8[0], neigh8[1], neigh8[2], neigh8[7], neigh8[3]);
peri += 0.5*PeriLargeCalcSide(h, neigh8[2], neigh8[3], neigh8[4], neigh8[1], neigh8[5]);
peri += 0.5*PeriLargeCalcSide(h, neigh8[4], neigh8[5], neigh8[6], neigh8[3], neigh8[7]);
peri += 0.5*PeriLargeCalcSide(h, neigh8[6], neigh8[7], neigh8[0], neigh8[5], neigh8[1]);
peridata = malloc(sizeof(PeriLargeData));
peridata->Area = 1;
peridata->Perimeter = peri;
return(peridata);
} /* NewPeriLargeData */
void DeletePeriLargeData(void *periattr)
{
free(periattr);
} /* DeletePeriLargeData */
void AddToPeriLargeData(void *periattr, ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
PeriLargeData *peridata = periattr;
double peri;
ulong neigh8[8];
unsigned char h;
h = Get8NeighValues(img, neigh8, x, y);
peri = 0.5*PeriLargeCalcSide(h, neigh8[0], neigh8[1], neigh8[2], neigh8[7], neigh8[3]);
peri += 0.5*PeriLargeCalcSide(h, neigh8[2], neigh8[3], neigh8[4], neigh8[1], neigh8[5]);
peri += 0.5*PeriLargeCalcSide(h, neigh8[4], neigh8[5], neigh8[6], neigh8[3], neigh8[7]);
peri += 0.5*PeriLargeCalcSide(h, neigh8[6], neigh8[7], neigh8[0], neigh8[5], neigh8[1]);
peridata->Area ++;
peridata->Perimeter += peri;
} /* AddToPeriLargeData */
void MergePeriLargeData(void *periattr, void *childattr)
{
PeriLargeData *peridata = periattr;
PeriLargeData *childdata = childattr;
peridata->Area += childdata->Area;
peridata->Perimeter += childdata->Perimeter;
} /* MergePeriLargeData */
double PeriLargeAreaAttribute(void *periattr)
{
PeriLargeData *peridata = periattr;
double area;
area = peridata->Area;
return(area);
} /* PeriLargeAreaAttribute */
double PeriLargePerimeterAttribute(void *periattr)
{
PeriLargeData *peridata = periattr;
double peri;
peri = peridata->Perimeter;
return(peri);
} /* PeriLargePerimeterAttribute */
double PeriLargeCompactnessAttribute(void *periattr)
{
PeriLargeData *peridata = periattr;
double area, peri;
area = peridata->Area;
peri = peridata->Perimeter;
return((peri*peri)/(4.0*PI*area));
} /* PeriLargeCompactnessAttribute */
/****** Typedefs and functions for small (8-conn.) perimeter attributes *********************/
typedef struct PeriSmallData
{
ulong Area;
double Perimeter;
} PeriSmallData;
double PeriSmallCalcSide(int h, int a, int b, int c)
{
double addarray[8] =
{
0.0, 0.25, 0.0, 2.0/9.0, 0.25, 2.0/9.0, 2.0/9.0, 0.0
};
double l;
#define PeriSmallBit(v) ((v)>=(h) ? 1 : 0)
l = sqrt(addarray[(PeriSmallBit(a)<<2)+(PeriSmallBit(b)<<1)+PeriSmallBit(c)]);
if (c>h)
{
if (b<h)
{
if (a<h)
{
return(l+1.0);
}
else if (a>h)
{
return(l+sqrt(2.0)*2.0/3.0);
}
}
else if (b>h)
{
if (a==h)
{
return(l-1.0);
}
else if (a>h)
{
return(l-sqrt(2.0));
}
}
}
return(l);
} /* PeriSmallCalcSide */
void *NewPeriSmallData(ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
PeriSmallData *peridata;
double peri;
ulong neigh8[8];
unsigned char h;
h = Get8NeighValues(img, neigh8, x, y);
peri = PeriSmallCalcSide(h, neigh8[7], neigh8[0], neigh8[1]);
peri += PeriSmallCalcSide(h, neigh8[1], neigh8[2], neigh8[3]);
peri += PeriSmallCalcSide(h, neigh8[3], neigh8[4], neigh8[5]);
peri += PeriSmallCalcSide(h, neigh8[5], neigh8[6], neigh8[7]);
peridata = malloc(sizeof(PeriSmallData));
peridata->Area = 1;
peridata->Perimeter = peri;
return(peridata);
} /* NewPeriSmallData */
void DeletePeriSmallData(void *periattr)
{
free(periattr);
} /* DeletePeriSmallData */
void AddToPeriSmallData(void *periattr, ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
PeriSmallData *peridata = periattr;
double peri;
ulong neigh8[8];
unsigned char h;
h = Get8NeighValues(img, neigh8, x, y);
peri = PeriSmallCalcSide(h, neigh8[7], neigh8[0], neigh8[1]);
peri += PeriSmallCalcSide(h, neigh8[1], neigh8[2], neigh8[3]);
peri += PeriSmallCalcSide(h, neigh8[3], neigh8[4], neigh8[5]);
peri += PeriSmallCalcSide(h, neigh8[5], neigh8[6], neigh8[7]);
peridata->Area ++;
peridata->Perimeter += peri;
} /* AddToPeriSmallData */
void MergePeriSmallData(void *periattr, void *childattr)
{
PeriSmallData *peridata = periattr;
PeriSmallData *childdata = childattr;
peridata->Area += childdata->Area;
peridata->Perimeter += childdata->Perimeter;
} /* MergePeriSmallData */
double PeriSmallAreaAttribute(void *periattr)
{
PeriSmallData *peridata = periattr;
double area;
area = peridata->Area;
return(area);
} /* PeriSmallAreaAttribute */
double PeriSmallPerimeterAttribute(void *periattr)
{
PeriSmallData *peridata = periattr;
double peri;
peri = peridata->Perimeter;
return(peri);
} /* PeriSmallPerimeterAttribute */
double PeriSmallCompactnessAttribute(void *periattr)
{
PeriSmallData *peridata = periattr;
double area, peri;
area = peridata->Area;
peri = peridata->Perimeter;
return((peri*peri)/(4.0*PI*area));
} /* PeriSmallCompactnessAttribute */
/****** Typedefs and functions for moment of inertia attributes **************************/
typedef struct InertiaData
{
ulong Area;
double SumX, SumY, SumX2, SumY2;
} InertiaData;
void *NewInertiaData(ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
InertiaData *inertiadata;
inertiadata = malloc(sizeof(InertiaData));
inertiadata->Area = 1;
inertiadata->SumX = x;
inertiadata->SumY = y;
inertiadata->SumX2 = x*x;
inertiadata->SumY2 = y*y;
return(inertiadata);
} /* NewInertiaData */
void DeleteInertiaData(void *inertiaattr)
{
free(inertiaattr);
} /* DeleteInertiaData */
void AddToInertiaData(void *inertiaattr, ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
InertiaData *inertiadata = inertiaattr;
inertiadata->Area ++;
inertiadata->SumX += x;
inertiadata->SumY += y;
inertiadata->SumX2 += x*x;
inertiadata->SumY2 += y*y;
} /* AddToInertiaData */
void MergeInertiaData(void *inertiaattr, void *childattr)
{
InertiaData *inertiadata = inertiaattr;
InertiaData *childdata = childattr;
inertiadata->Area += childdata->Area;
inertiadata->SumX += childdata->SumX;
inertiadata->SumY += childdata->SumY;
inertiadata->SumX2 += childdata->SumX2;
inertiadata->SumY2 += childdata->SumY2;
} /* MergeInertiaData */
double InertiaAttribute(void *inertiaattr)
{
InertiaData *inertiadata = inertiaattr;
double area, inertia;
area = inertiadata->Area;
inertia = inertiadata->SumX2 + inertiadata->SumY2 -
(inertiadata->SumX * inertiadata->SumX +
inertiadata->SumY * inertiadata->SumY) / area
+ area / 6.0;
return(inertia);
} /* InertiaAttribute */
double InertiaDivA2Attribute(void *inertiaattr)
{
InertiaData *inertiadata = inertiaattr;
double inertia, area;
area = (double)(inertiadata->Area);
inertia = inertiadata->SumX2 + inertiadata->SumY2 -
(inertiadata->SumX * inertiadata->SumX +
inertiadata->SumY * inertiadata->SumY) / area
+ area / 6.0;
return(inertia*2.0*PI/(area*area));
} /* InertiaDivA2Attribute */
double MeanXAttribute(void *inertiaattr)
{
InertiaData *inertiadata = inertiaattr;
double area, sumx;
area = inertiadata->Area;
sumx = inertiadata->SumX;
return(sumx/area);
} /* MeanXAttribute */
double MeanYAttribute(void *inertiaattr)
{
InertiaData *inertiadata = inertiaattr;
double area, sumy;
area = inertiadata->Area;
sumy = inertiadata->SumY;
return(sumy/area);
} /* MeanYAttribute */
/****** Typedefs and functions for jaggedness attributes *********************/
typedef struct JaggedData
{
ulong Area;
ulong Perimeter;
double SumX, SumY, SumX2, SumY2;
} JaggedData;
void *NewJaggedData(ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
JaggedData *jaggeddata;
ulong lx=x, ly=y, p, peri=0, q;
int i;
unsigned char h;
p = ly*(img->Width) + lx;
h = img->Pixmap[p];
peri += CONNECTIVITY-numneighbors;
for (i=0; i<numneighbors; i++)
{
q = neighbors[i];
if (img->Pixmap[q]<h) peri++;
if (img->Pixmap[q]>h) peri--;
}
jaggeddata = malloc(sizeof(JaggedData));
jaggeddata->Area = 1;
jaggeddata->Perimeter = peri;
jaggeddata->SumX = x;
jaggeddata->SumY = y;
jaggeddata->SumX2 = x*x;
jaggeddata->SumY2 = y*y;
return(jaggeddata);
} /* NewJaggedData */
void DeleteJaggedData(void *jaggedattr)
{
free(jaggedattr);
} /* DeleteJaggedData */
void AddToJaggedData(void *jaggedattr, ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
JaggedData *jaggeddata = jaggedattr;
ulong lx=x, ly=y, p, peri=0, q;
int i;
unsigned char h;
p = ly*(img->Width) + lx;
h = img->Pixmap[p];
peri += CONNECTIVITY-numneighbors;
for (i=0; i<numneighbors; i++)
{
q = neighbors[i];
if (img->Pixmap[q]<h) peri++;
if (img->Pixmap[q]>h) peri--;
}
jaggeddata->Area ++;
jaggeddata->Perimeter += peri;
jaggeddata->SumX += x;
jaggeddata->SumY += y;
jaggeddata->SumX2 += x*x;
jaggeddata->SumY2 += y*y;
} /* AddToJaggedData */
void MergeJaggedData(void *jaggedattr, void *childattr)
{
JaggedData *jaggeddata = jaggedattr;
JaggedData *childdata = childattr;
jaggeddata->Area += childdata->Area;
jaggeddata->Perimeter += childdata->Perimeter;
jaggeddata->SumX += childdata->SumX;
jaggeddata->SumY += childdata->SumY;
jaggeddata->SumX2 += childdata->SumX2;
jaggeddata->SumY2 += childdata->SumY2;
} /* MergeJaggedData */
double JaggedAttribute(void *jaggedattr)
{
JaggedData *jaggeddata = jaggedattr;
double peri;
peri = jaggeddata->Perimeter;
return(peri);
} /* JaggedPerimeterAttribute */
double JaggedCompactnessAttribute(void *jaggedattr)
{
JaggedData *jaggeddata = jaggedattr;
double area, peri;
area = (double)(jaggeddata->Area);
peri = jaggeddata->Perimeter;
return((peri*peri)/(4.0*PI*area));
} /* JaggedCompactnessAttribute */
double JaggedInertiaDivA2Attribute(void *jaggedattr)
{
JaggedData *jaggeddata = jaggedattr;
double inertia, area;
area = (double)(jaggeddata->Area);
inertia = jaggeddata->SumX2 + jaggeddata->SumY2 -
(jaggeddata->SumX * jaggeddata->SumX +
jaggeddata->SumY * jaggeddata->SumY) / area
+ area / 6.0;
return(inertia*2.0*PI/(area*area));
} /* JaggedInertiaDivA2Attribute */
double JaggednessAttribute(void *jaggedattr)
{
JaggedData *jaggeddata = jaggedattr;
double area, peri, inertia;
area = (double)(jaggeddata->Area);
peri = jaggeddata->Perimeter;
inertia = jaggeddata->SumX2 + jaggeddata->SumY2 -
(jaggeddata->SumX * jaggeddata->SumX +
jaggeddata->SumY * jaggeddata->SumY) / area
+ area / 6.0;
return(area*peri*peri/(8.0*PI*PI*inertia));
} /* JaggednessAttribute */
/****** Typedefs and functions for Entropy attributes ******************************/
/* TODO: check all attribute functions below for use of pixelsize */
typedef struct EntropyData
{
ulong Hist[NUMLEVELS];
} EntropyData;
void *NewEntropyData(ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
EntropyData *entropydata;
ulong lx=x, ly=y, p;
int i;
p = ly*(img->Width) + lx;
entropydata = malloc(sizeof(EntropyData));
for (i=0; i<NUMLEVELS; i++) entropydata->Hist[i] = 0;
entropydata->Hist[img->Pixmap[p]] = 1;
return(entropydata);
} /* NewEntropyData */
void DeleteEntropyData(void *entropyattr)
{
free(entropyattr);
} /* DeleteEntropyData */
void AddToEntropyData(void *entropyattr, ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
EntropyData *entropydata = entropyattr;
ulong lx=x, ly=y, p;
p = ly*(img->Width) + lx;
entropydata->Hist[img->Pixmap[p]] ++;
} /* AddToEntropyData */
void MergeEntropyData(void *entropyattr, void *childattr)
{
EntropyData *entropydata = entropyattr;
EntropyData *childdata = childattr;
int i;
for (i=0; i<NUMLEVELS; i++) entropydata->Hist[i] += childdata->Hist[i];
} /* MergeEntropyData */
double EntropyAttribute(void *entropyattr)
{
EntropyData *entropydata = entropyattr;
double p[NUMLEVELS];
double num=0.0, entropy = 0.0;
int i;
for (i=0; i<NUMLEVELS; i++) num += entropydata->Hist[i];
for (i=0; i<NUMLEVELS; i++) p[i] = (entropydata->Hist[i])/num;
for (i=0; i<NUMLEVELS; i++) entropy += p[i] * (log(p[i]+0.00001)/log(2.0));
return(-entropy);
} /* EntropyAttribute */
/****** Typedefs and functions for lambda-max attributes *************************/
typedef struct LambdamaxData
{
unsigned char MinLevel;
unsigned char MaxLevel;
} LambdamaxData;
void *NewLambdamaxData(ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
LambdamaxData *lambdadata;
lambdadata = malloc(sizeof(LambdamaxData));
lambdadata->MinLevel = img->Pixmap[y*(img->Width)+x];
lambdadata->MaxLevel = img->Pixmap[y*(img->Width)+x];
return(lambdadata);
} /* NewLambdamaxData */
void DeleteLambdamaxData(void *lambdaattr)
{
free(lambdaattr);
} /* DeleteLambdamaxData */
void AddToLambdamaxData(void *lambdaattr, ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
} /* AddToLambdamaxData */
void MergeLambdamaxData(void *lambdaattr, void *childattr)
{
LambdamaxData *lambdadata = lambdaattr;
LambdamaxData *childdata = childattr;
if (childdata->MaxLevel > lambdadata->MaxLevel) lambdadata->MaxLevel = childdata->MaxLevel;
} /* MergeLambdamaxData */
double LambdamaxAttribute(void *lambdaattr)
{
LambdamaxData *lambdadata = lambdaattr;
double height;
height = ((double)lambdadata->MaxLevel) - ((double)lambdadata->MinLevel);
return(height);
} /* LambdamaxAttribute */
/****** Typedefs and functions for graylevel attributes ******************************/
typedef struct LevelData
{
unsigned char level;
} LevelData;
void *NewLevelData(ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
LevelData *leveldata;
leveldata = malloc(sizeof(LevelData));
leveldata->level = img->Pixmap[y*(img->Width)+x];
return(leveldata);
} /* NewLevelData */
void DeleteLevelData(void *levelattr)
{
free(levelattr);
} /* DeleteLevelData */
void AddToLevelData(void *levelattr, ulong x, ulong y, int numneighbors, ulong *neighbors, ImageGray *img)
{
} /* AddToLevelData */
void MergeLevelData(void *levelattr, void *childattr)
{
} /* MergeLevelData */
double LevelAttribute(void *levelattr)
{
LevelData *leveldata = levelattr;
double level;
level = leveldata->level;
return(level);
} /* LevelAttribute */
/****** Image create/read/write functions ******************************/
ImageGray *ImageGrayFromImage( unsigned char *pixmap, ulong width, ulong height)
{
ImageGray *img;
img = malloc(sizeof(ImageGray));
if (img==NULL) return(NULL);
img->Width = width;
img->Height = height;
img->Pixmap = pixmap;
return(img);
} /* ImageGrayFromImage */
ImageGray *ImageGrayCreate(ulong width, ulong height)
{
ImageGray *img;
img = malloc(sizeof(ImageGray));
if (img==NULL) return(NULL);
img->Width = width;
img->Height = height;
img->Pixmap = malloc(width*height);
if (img->Pixmap==NULL)