ee96a02c
 David Mayerich
first commit from...
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#include "GlobalValues.h"
#include <QImage>
struct HistogramStruct{
unsigned int* hist2D;
int nBins;
float bounds[4];
HistogramStruct(float minX, float minY, float maxX, float maxY, int bins){
//allocate memory for the histogram
hist2D = (unsigned int*)malloc(sizeof(unsigned int)*bins*bins);
memset(hist2D, 0, sizeof(unsigned int)*bins*bins);
bounds[0] = minX;
bounds[1] = maxX;
bounds[2] = minY;
bounds[3] = maxY;
nBins = bins;
}
bool checkBounds(float x, float y){
if(x < bounds[0] || x > bounds[1] || y < bounds[2] || y > bounds[3])
return false;
else return true;
}
void increment(float x, float y){
//increment the counter at the appropriate histogram location
//is the location within the bounds of the histogram
if(checkBounds(x, y)){
int binX = (x - bounds[0])/(bounds[1] - bounds[0]) * nBins;
int binY = (y - bounds[2])/(bounds[3] - bounds[2]) * nBins;
hist2D[binY * nBins + binX]++;
}
}
void saveImage(string fileName){
//create an output image
QImage outImage(nBins, nBins, QImage::Format_RGB888);
//find the maximum value in the histogram
unsigned int histMax = 0;
for(int i=0; i<nBins*nBins; i++)
if(hist2D[i] > histMax)
histMax = hist2D[i];
cout<<"HistMax: "<<histMax;
//convert all histogram values into colors and save
int x, y;
unsigned char intensity;
QRgb color;
for(x=0; x<nBins; x++)
for(y=0; y<nBins; y++){
intensity = log((double)hist2D[y*nBins + x]) / log((double)histMax) * 255;
//cout<<(int)intensity<<endl;
color = qRgb(intensity, intensity, intensity);
outImage.setPixel(x, y, color);
}
//save the image file
outImage.save(fileName.c_str());
}
};
void CreateHistogram(int bins, float& minU, float& maxU, float& minV, float& maxV)
{
VolumeData vol = VolumeList[0];
int Sx = vol.Dim.x;
int Sy = vol.Dim.y;
int Sz = vol.Dim.z;
int C = 3;
//create the histogram
HistogramStruct histogram(minU, minV, maxU, maxV, bins);
//get the texture data from the GPU
//allocate memory for the volume
unsigned char* cpuVolume;
int size = sizeof(unsigned char) * C * Sx * Sy * Sz;
cpuVolume = (unsigned char*)malloc(size);
memset(cpuVolume, 0, size);
//copy the texture from the GPU
vol.Texture.BeginTexture();
glGetTexImage(GL_TEXTURE_3D, 0, GL_RGB, GL_UNSIGNED_BYTE, cpuVolume);
int x, y, z, c;
float maxVal = 0;
float u, v;
float xn, xp, yn, yp, zn, zp;
float dx, dy, dz;
minU = 99999;
maxU = -99999;
minV = 99999;
maxV = -99999;
for(x=1; x<Sx-1; x++)
for(y=1; y<Sy-1; y++)
for(z=1; z<Sz-1; z++)
for(c=0; c<1; c++)
{
//compute the gradient magnitude
u = cpuVolume[z*Sx*Sy*C + y*Sx*C + x*C + c];
xn = cpuVolume[z*Sx*Sy*C + y*Sx*C + (x-1)*C + c];
xp = cpuVolume[z*Sx*Sy*C + y*Sx*C + (x+1)*C + c];
yn = cpuVolume[z*Sx*Sy*C + (y-1)*Sx*C + x*C + c];
yp = cpuVolume[z*Sx*Sy*C + (y+1)*Sx*C + x*C + c];
zn = cpuVolume[(z-1)*Sx*Sy*C + y*Sx*C + x*C + c];
zp = cpuVolume[(z+1)*Sx*Sy*C + y*Sx*C + x*C + c];
dx = (xp - xn)/2.0;
dy = (yp - yn)/2.0;
dz = (zp - zn)/2.0;
v = sqrt(dx*dx + dy*dy + dz*dz);
histogram.increment(u, v);
if(v < minV)
minV = v;
if(v > maxV)
maxV = v;
if(u < minU)
minU = u;
if(u > maxU)
maxU = u;
}
free(cpuVolume);
cout<<"Data Value: "<<maxVal<<endl;
//save the histogram image
histogram.saveImage("testHistogram.bmp");
}
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