/**
* Returns the number of black and white differences between the template and exam file.
*
* @param img Image of exams
* @param x x start coordinate of the file
* @param y y start coordinate of the file
* @param template Template of exams
* @param dump Dump to screen
* @return The difference
*/
public static double templateXOR(
Gray8Image img, int x, int y, Gray8Image template, boolean dump) {
int diff = 0, total = 0;
for (int j = y; j < y + template.getHeight() && j < img.getHeight(); j++) {
for (int i = x; i < x + template.getWidth() && i < img.getWidth(); i++) {
// XXX
boolean isblack = (img.getSample(i, j) < 200 ? true : false);
// if(dump) { System.out.print((isblack
// & template.isWhite(i - x, j - y) ? "1" : ((!isblack)
// & template.isBlack(i - x, j - y)) ? "-" : "0")); }
if ((isblack & template.isWhite(i - x, j - y)
| (!isblack) & template.isBlack(i - x, j - y))) {
diff++;
}
total++;
}
// if(dump) { System.out.println(); }
}
return ((double) diff) / total;
}
