/**
* This is a callback to be executed before resampleSingle is executed. The bilinear interpolation
* coefficients are computed here and vary with the single, active slice. The offset into the
* intermediate image is also computed since this also varies with the active slice. If encoding
* of transparent data has occurred in the renderer constructor, then the current slice of the
* encoding table is initialized for use by resampleSingle.
*/
protected void beforeResampleSingle() {
// compute the 0-direction index ranges and weighting factors
float fMin = (m_afShear[0] * m_iSlice) + m_afOffset[0];
m_afA[0] = fMin - (float) Math.floor(fMin);
m_afB[0] = 1.0f - m_afA[0];
int iMin0 = (int) Math.ceil(fMin);
// compute the 0-direction index ranges and weighting factors
fMin = (m_afShear[1] * m_iSlice) + m_afOffset[1];
m_afA[1] = fMin - (float) Math.floor(fMin);
m_afB[1] = 1.0f - m_afA[1];
int iMin1 = (int) Math.ceil(fMin);
// offset into intermediate image of rendered voxel data
m_iInterOffset = iMin0 + (m_iInterBound * iMin1);
if (m_bDoEncodeSkip) {
m_aasSliceEncode = m_aaasVolumeEncode[m_iSlice];
}
}
public void analyze(boolean doit) {
float min = Float.POSITIVE_INFINITY;
float max = Float.NEGATIVE_INFINITY;
for (int k = 0; k < size; k++) {
// System.out.println(f[k]);
/*
* if (f[k] == Float.NaN) { System.out.println("NaN at k= "+k);
* f[k] = 0f; }
*/
if (Float.isNaN(f[k])) {
System.out.println("NaN at k= " + k);
f[k] = 0f;
continue;
}
if (Float.isInfinite(f[k])) {
if (f[k] < 0) {
System.out.println("-Infinity at k= " + k);
f[k] = 0f; // -1000f;
} else {
System.out.println("+Infinity at k= " + k);
f[k] = 0f; // +1000f;
}
continue;
}
// System.out.print(k +"="+f[k]+ ", ");
min = Math.min(min, f[k]);
max = Math.max(max, f[k]);
}
int N = 256;
float[] histogram = new float[N];
for (int k = 0; k < size; k++) {
int level = (int) (0.999f * (float) N * (f[k] - min) / (max - min));
try {
histogram[level]++;
} catch (ArrayIndexOutOfBoundsException e) {
System.out.println("ArrayIndexOutOfBoundsException in ScalarImage.analyze(double) [A].");
}
}
float[] cumulative = new float[N];
if (histogram[0] > 0) {
if (doit) {
cumulative[0] = histogram[0];
} else {
cumulative[0] = 1; // histogram[0];
}
}
for (int i = 1; i < N; i++) {
if (histogram[i] > 0) {
if (doit) {
cumulative[i] = cumulative[i - 1] + histogram[i];
} else {
cumulative[i] = cumulative[i - 1] + 1; // histogram[i];
}
} else {
cumulative[i] = cumulative[i - 1];
}
}
/* for(int k=0; k<size; k++) {
int level = (int) ( 0.999f*(float)N*(f[k]-min)/(max-min) );
try {
f[k]=(cumulative[level]-cumulative[0])/(cumulative[N-1]-cumulative[0]);
} catch( ArrayIndexOutOfBoundsException e) {
System.out.println("ArrayIndexOutOfBoundsException in ScalarImage.analyze(double) [B].");
}
}
*/
for (int k = 0; k < size; k++) {
float x, x1, x2, f1, f2;
try {
x = Math.abs((f[k] - min) / (max - min));
x1 = (float) Math.floor((float) (N - 1) * x * 0.999f) / (float) (N - 1);
x2 = (float) Math.ceil((float) (N - 1) * x * 0.999f) / (float) (N - 1);
f1 =
(cumulative[(int) Math.floor((float) (N - 1) * x * 0.999f)] - cumulative[0])
/ (cumulative[N - 1] - cumulative[0]);
f2 =
(cumulative[(int) Math.ceil((float) (N - 1) * x * 0.999f)] - cumulative[0])
/ (cumulative[N - 1] - cumulative[0]);
f[k] = (f2 - f1) * (x - x1) / (x2 - x1) + f1;
} catch (ArrayIndexOutOfBoundsException e) {
System.out.println(
"ArrayIndexOutOfBoundsException in ScalarImage.analyze(double) [C]. " + e.getMessage());
}
}
return;
/*
double offset = 0. - min;
if ((max - min) != 0f) {
scale /= (max - min);
offset *= scale;
rescale(scale, offset);
}
System.out.println("Normalizing using: min= " + min + " max= " + max
+ ", through scaleAdd(" + scale + ", " + offset + ").");
min = 1000f;
max = -1000f;
for (int k = 0; k < size; k++) {
if (Float.isNaN(f[k])) {
System.out.println("NaN at k= " + k + " after normalization.");
f[k] = 0f;
continue;
}
min = Math.min(min, f[k]);
max = Math.max(max, f[k]);
}
System.out.println("After normalization: min= " + min + " max= " + max);
*/
}