/**
* Scales the range of <code>image</code> to an arbitrary min/max in a Region of Interest. The
* range used for all planes is the global max, min of the image.
*
* @param image ColorImage to scale.
* @param roi Region of Interest of <code>image</code>.
* @return <code>image</code>.
*/
protected Image apply(ColorImage image, ROI roi) {
GrayImage plane;
int int_max = (int) float_max;
int int_min = (int) float_min;
float min = (float) image.min(roi);
float max = (float) image.max(roi);
float r = 0;
float range = max - min;
float value = 0;
if (range == 0) range = 1; // to avoid divide by zero problems
for (int i = 0; i < 3; i++) {
plane = image.plane(i);
for (int y = roi.uy(); y <= roi.ly(); y++) {
for (int x = roi.ux(); x <= roi.lx(); x++) {
r = (float) plane.get(x, y);
value = (((r - min) / (range) * (int_max - int_min)) + int_min);
plane.set(x, y, (short) value);
}
}
image.setPlane(i, plane);
}
return image;
}
/**
* Writes a GrayImage to a file
*
* @param im the GrayImage
*/
public void write(GrayImage im) throws IOException {
X = im.X();
Y = im.Y();
// convert to byte size
GrayImage tmpim = (GrayImage) im.copy();
tmpim.byteSize();
// write PGM in raw format
writeRawPGMHeader(X, Y);
for (int y = 0; y < Y; y++) {
for (int x = 0; x < X; x++) {
data.write((byte) tmpim.get(x, y));
}
}
}