public IplImage correctGamma(IplImage img) {
// get image intensity
// img.applyGamma(d);
IplImage gray = cvCreateImage(cvGetSize(img), IPL_DEPTH_8U, 1);
cvCvtColor(img, gray, CV_RGB2GRAY);
BufferedImage buffImg = img.getBufferedImage();
BufferedImage buffGray = gray.getBufferedImage();
double grayArr[] = new double[gray.width() * gray.height()];
int counter = 0;
for (int i = 0; i < gray.width(); i++) {
for (int j = 0; j < gray.height(); j++) {
grayArr[counter] = buffGray.getRGB(i, j);
counter++;
}
}
double imgSd = new StandardDeviation().evaluate(grayArr);
double imgMean = new Mean().evaluate(grayArr);
double y = 0;
if (imgMean > 0.5) y = 1 + (Math.abs(0.5 - imgMean) / imgSd);
else y = 1 / (1 + (Math.abs(0.5 - imgMean) / imgSd));
img.applyGamma(y);
return img;
}
