/**
* Working ... This function is never used. It doesn't modify any parameters or data members and
* returns void.
*
* @param image DOCUMENT ME!
* @param doColor DOCUMENT ME!
*/
public void calculatePrincipleAxis(ModelImage image, boolean doColor) {
int x, y, z;
int n = 0;
Matrix3f mat2 = new Matrix3f(); // Row,Col
Matrix3f meanProduct = new Matrix3f();
Vector3f mean = new Vector3f(); // Column vector
double voxVal = 0;
double total = 0;
double tot = 0;
// Moments first and second order
double mX = 0, mY = 0, mZ = 0, mXX = 0, mXY = 0, mXZ = 0, mYY = 0, mYZ = 0, mZZ = 0;
float min = (float) image.getMin();
int xEnd = image.getExtents()[0];
int yEnd = image.getExtents()[1];
int zEnd = image.getExtents()[2];
int nLim = (int) Math.sqrt((double) xEnd * yEnd * zEnd);
if (nLim < 1000) {
nLim = 1000;
}
for (z = 0; z < zEnd; z++) {
for (y = 0; y < yEnd; y++) {
for (x = 0; x < xEnd; x++) {
if (doColor) {
voxVal =
(double)
(image.getFloatC(x, y, z, 1)
+ image.getFloatC(x, y, z, 2)
+ image.getFloatC(x, y, z, 3));
} else {
voxVal = (double) (image.getFloat(x, y, z) - min);
}
mX += voxVal * x;
mY += voxVal * y;
mZ += voxVal * z;
mXX += voxVal * x * x;
mXY += voxVal * x * y;
mXZ += voxVal * x * z;
mYY += voxVal * y * y;
mYZ += voxVal * y * z;
mZZ += voxVal * z * z;
tot += voxVal;
n++;
if (n > nLim) { // Lets not over run the buffers during summation
n = 0;
total += tot;
mat2.M00 = (float) (mat2.M00 + mXX);
mat2.M01 = (float) (mat2.M01 + mXY);
mat2.M02 = (float) (mat2.M02 + mXZ);
mat2.M11 = (float) (mat2.M11 + mYY);
mat2.M12 = (float) (mat2.M12 + mYZ);
mat2.M22 = (float) (mat2.M22 + mZZ);
mean.X = (float) (mean.X + mX);
mean.Y = (float) (mean.Y + mY);
mean.Z = (float) (mean.Z + mZ);
tot = 0;
mX = 0;
mY = 0;
mZ = 0;
mXX = 0;
mXY = 0;
mXZ = 0;
mYY = 0;
mYZ = 0;
mZZ = 0;
}
}
}
}
total += tot;
if (Math.abs(total) < 1e-5) {
total = 1.0f;
}
mat2.M00 = (float) ((mat2.M00 + mXX) / total);
mat2.M01 = (float) ((mat2.M01 + mXY) / total);
mat2.M02 = (float) ((mat2.M02 + mXZ) / total);
mat2.M11 = (float) ((mat2.M11 + mYY) / total);
mat2.M12 = (float) ((mat2.M12 + mYZ) / total);
mat2.M22 = (float) ((mat2.M22 + mZZ) / total);
mean.X = (float) ((mean.X + mX) / total);
mean.Y = (float) ((mean.Y + mY) / total);
mean.Z = (float) ((mean.Z + mZ) / total);
// Now make it central (taking off the Center of Mass)
meanProduct.MakeTensorProduct(mean, mean);
mat2.M00 -= meanProduct.M00;
mat2.M01 -= meanProduct.M01;
mat2.M02 -= meanProduct.M02;
mat2.M10 -= meanProduct.M10;
mat2.M11 -= meanProduct.M11;
mat2.M12 -= meanProduct.M12;
mat2.M20 -= meanProduct.M20;
mat2.M21 -= meanProduct.M21;
mat2.M22 -= meanProduct.M22;
}
