// compare the two images in this object.
public void compare() {
// setup change display image
imgc = imageToBufferedImage(img1);
Graphics2D gc = imgc.createGraphics();
gc.setColor(Color.RED);
// convert to gray images.
img1 = imageToBufferedImage(GrayFilter.createDisabledImage(img1));
img2 = imageToBufferedImage(GrayFilter.createDisabledImage(img2));
// how big are each section
int blocksx = (int) (img1.getWidth() / comparex);
int blocksy = (int) (img1.getHeight() / comparey);
// set to a match by default, if a change is found then flag non-match
this.match = true;
// loop through whole image and compare individual blocks of images
for (int y = 0; y < comparey; y++) {
if (debugMode > 0) System.out.print("|");
for (int x = 0; x < comparex; x++) {
int b1 =
getAverageBrightness(
img1.getSubimage(x * blocksx, y * blocksy, blocksx - 1, blocksy - 1));
int b2 =
getAverageBrightness(
img2.getSubimage(x * blocksx, y * blocksy, blocksx - 1, blocksy - 1));
int diff = Math.abs(b1 - b2);
if (diff
> factorA) { // the difference in a certain region has passed the threshold value of
// factorA
// draw an indicator on the change image to show where change was detected.
gc.drawRect(x * blocksx, y * blocksy, blocksx - 1, blocksy - 1);
this.match = false;
}
if (debugMode == 1) System.out.print((diff > factorA ? "X" : " "));
if (debugMode == 2) System.out.print(diff + (x < comparex - 1 ? "," : ""));
}
if (debugMode > 0) System.out.println("|");
}
}
private static ImageIcon makeGrayImageIcon3(Image img) {
// GrayFilter1
return new ImageIcon(GrayFilter.createDisabledImage(img));
}