public void mergeTwoImages(BufferedImage firstImage) {
int width = originalImage.getWidth();
int height = originalImage.getHeight();
int black = 0;
int white = 255;
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
int rgb;
int oldColor = new Color(originalImage.getRGB(i, j)).getRed();
if (oldColor == white) {
int alpha = new Color(firstImage.getRGB(i, j)).getAlpha();
rgb = PreprocessingHelper.colorToRGB(alpha, black, black, black);
} else {
rgb = new Color(firstImage.getRGB(i, j)).getRGB();
}
filteredImage.setRGB(i, j, rgb);
}
}
}
@Override
public BufferedImage processImage(BufferedImage image) {
originalImage = image;
wSize = 31;
k = 0.02;
int width = originalImage.getWidth();
int height = originalImage.getHeight();
filteredImage = new BufferedImage(width, height, originalImage.getType());
int alpha;
double gray;
double[][] G = new double[width][height]; // Integral sum G
gray = new Color(originalImage.getRGB(0, 0)).getRed();
G[0][0] = gray / 255;
for (int i = 1; i < width; i++) {
gray = new Color(originalImage.getRGB(i, 0)).getRed();
G[i][0] = G[i - 1][0] + gray / 255;
}
for (int j = 1; j < height; j++) {
gray = new Color(originalImage.getRGB(0, j)).getRed();
G[0][j] = G[0][j - 1] + gray / 255;
}
for (int i = 1; i < width; i++) {
for (int j = 1; j < height; j++) {
gray = new Color(originalImage.getRGB(i, j)).getRed();
G[i][j] = gray / 255 + G[i][j - 1] + G[i - 1][j] - G[i - 1][j - 1];
}
}
int d = wSize / 2;
int A = 0;
int B = 0;
int C = 0;
int D = 0;
double s;
double m;
double delta;
double treshold;
int newColor;
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
if (i + d - 1 >= width) {
A = width - 1;
} else {
A = i + d - 1;
}
if (j + d - 1 >= height) {
B = height - 1;
} else {
B = j + d - 1;
}
if (i - d < 0) {
C = 0;
} else {
C = i - d;
}
if (j - d < 0) {
D = 0;
} else {
D = j - d;
}
s = (G[A][B] + G[C][D]) - (G[C][B] + G[A][D]);
m = s / (wSize * wSize);
gray = new Color(originalImage.getRGB(i, j)).getRed();
delta = gray / 255 - m;
treshold = m * (1 + k * (delta / (1.0 - delta) - 1));
if (gray / 255 > treshold) {
newColor = 255;
} else {
newColor = 0;
}
alpha = new Color(originalImage.getRGB(i, j)).getAlpha();
newColor = PreprocessingHelper.colorToRGB(alpha, newColor, newColor, newColor);
filteredImage.setRGB(i, j, newColor);
}
}
return filteredImage;
}