- public int getWidth() {
- return image.width();
- }
-
- public void estimateBlackPoint(BlackPointEstimationMethod method, int argument) throws ReaderException {
- if (!method.equals(lastMethod) || argument != lastArgument) {
- int width = image.width();
- int height = image.height();
- int[] histogram = new int[LUMINANCE_BUCKETS];
- float biasTowardsWhite = 1.0f;
- if (method.equals(BlackPointEstimationMethod.TWO_D_SAMPLING)) {
- int minDimension = width < height ? width : height;
- int startI = height == minDimension ? 0 : (height - width) >> 1;
- int startJ = width == minDimension ? 0 : (width - height) >> 1;
- for (int n = 0; n < minDimension; n++) {
- int pixel = image.getPixel(startJ + n, startI + n);
- histogram[((pixel >> 16) & 0xFF) >> LUMINANCE_SHIFT]++;
- }
- } else if (method.equals(BlackPointEstimationMethod.ROW_SAMPLING)) {
- if (argument < 0 || argument >= height) {
- throw new IllegalArgumentException("Row is not within the image: " + argument);
- }
- biasTowardsWhite = 2.0f;
- int[] pixelRow = new int[width];
- image.getPixels(pixelRow, 0, width, 0, argument, width, 1);
- for (int x = 0; x < width; x++) {
- histogram[((pixelRow[x] >> 16) & 0xFF) >> LUMINANCE_SHIFT]++;
- }
- } else {
- throw new IllegalArgumentException("Unknown method: " + method);
- }
- blackPoint = BlackPointEstimator.estimate(histogram, biasTowardsWhite) << LUMINANCE_SHIFT;
- lastMethod = method;
- lastArgument = argument;