/** * Scales the range of <code>image</code> to an arbitrary min/max in a Region of Interest. The * range used for all planes is the global max, min of the image. * * @param image ColorImage to scale. * @param roi Region of Interest of <code>image</code>. * @return <code>image</code>. */ protected Image apply(ColorImage image, ROI roi) { GrayImage plane; int int_max = (int) float_max; int int_min = (int) float_min; float min = (float) image.min(roi); float max = (float) image.max(roi); float r = 0; float range = max - min; float value = 0; if (range == 0) range = 1; // to avoid divide by zero problems for (int i = 0; i < 3; i++) { plane = image.plane(i); for (int y = roi.uy(); y <= roi.ly(); y++) { for (int x = roi.ux(); x <= roi.lx(); x++) { r = (float) plane.get(x, y); value = (((r - min) / (range) * (int_max - int_min)) + int_min); plane.set(x, y, (short) value); } } image.setPlane(i, plane); } return image; }
/** * Writes a GrayImage to a file * * @param im the GrayImage */ public void write(GrayImage im) throws IOException { X = im.X(); Y = im.Y(); // convert to byte size GrayImage tmpim = (GrayImage) im.copy(); tmpim.byteSize(); // write PGM in raw format writeRawPGMHeader(X, Y); for (int y = 0; y < Y; y++) { for (int x = 0; x < X; x++) { data.write((byte) tmpim.get(x, y)); } } }
/** * Scales the range of <code>image</code> to an arbitrary min/max. * * @param image GrayImage to scale. * @return <code>image</code>. */ protected Image apply(GrayImage image) { return apply(image, new ROI(0, 0, image.X() - 1, image.Y() - 1)); }