/**
* Converts an image (RGB, RGBA, ... whatever) to a binary one based on given threshold
*
* @param image the image to convert. Remains untouched.
* @param threshold the threshold in [0,255]
* @return a new BufferedImage instance of TYPE_BYTE_GRAY with only 0'S and 255's
*/
private static BufferedImage thresholdImage(Image imgIn, Image imgOut, int threshold) {
if (imgOut.getBufferedImage().getType() != BufferedImage.TYPE_BYTE_GRAY) {
final BufferedImage result =
new BufferedImage(imgIn.getWidth(), imgIn.getHeight(), BufferedImage.TYPE_BYTE_GRAY);
final Graphics g = result.getGraphics();
g.drawImage(imgIn.getBufferedImage(), 0, 0, null);
g.dispose();
imgOut.setBufferedImage(result);
System.err.println("Image was converted into BufferedImage.TYPE_BYTE_GRAY type");
}
BufferedImage result = imgOut.getBufferedImage();
result.getGraphics().drawImage(imgIn.getBufferedImage(), 0, 0, null);
WritableRaster raster = result.getRaster();
int[] pixels = new int[imgIn.getWidth()];
for (int y = 0; y < imgIn.getHeight(); y++) {
raster.getPixels(0, y, imgIn.getWidth(), 1, pixels);
for (int i = 0; i < pixels.length; i++) {
pixels[i] = (pixels[i] < threshold) ? 0 : 255;
}
raster.setPixels(0, y, imgIn.getWidth(), 1, pixels);
}
return result;
}
public static int[][] toIntArray(Image img, int signal, int background) {
int[][] ret = new int[img.getWidth()][img.getHeight()];
for (int i = 0; i < img.getWidth(); i++) {
for (int j = 0; j < img.getHeight(); j++) {
ret[i][j] = img.getRed(i, j) < 128 ? signal : background;
}
}
return ret;
}
@Override
public void process(Image imgIn, Image imgOut) {
res = compactLabeling(toIntArray(imgIn), imgIn.getWidth(), imgIn.getHeight(), true);
final int scale = getMaxLabel() + 1;
fromIntArray(res, scale, imgOut);
setAttribute("result", res);
setAttribute("nr", getMaxLabel());
}
public static void fromIntArray(int[][] im, int size, Image out) {
Color[] c = ColorTable.randomColorArray(size);
c[0] = Color.white;
for (int i = 0; i < out.getWidth(); i++) {
for (int j = 0; j < out.getHeight(); j++) {
out.setRGB(i, j, c[im[i][j]].getRGB());
}
}
}