/**
* Highlights an area in a RgbImage by turning the non-masked areas gray and dimming them.
*
* @return the masked color image.
* @param imRgb the input RgbImage.
* @param imMask The input mask. Pixels with the value Byte.MIN_VALUE are unmasked. Everything
* else is considered to be masked.
* @throws Error if the input sizes do not match
*/
public RgbImage push(RgbImage imRgb, Gray8Image imMask) throws Error {
if (imRgb.getWidth() != imMask.getWidth() || imRgb.getHeight() != imMask.getHeight()) {
throw new Error(
Error.PACKAGE.CORE,
jjil.core.ErrorCodes.IMAGE_MASK_SIZE_MISMATCH,
imRgb.toString(),
imMask.toString(),
null);
}
int[] rgbData = imRgb.getData();
byte[] maskData = imMask.getData();
for (int i = 0; i < imRgb.getWidth() * imRgb.getHeight(); i++) {
if (maskData[i] == Byte.MIN_VALUE) {
/* get individual r, g, and b values, unmasking them from the
* ARGB word and converting to an unsigned byte.
*/
int r = RgbVal.getR(rgbData[i]) - Byte.MIN_VALUE;
int g = RgbVal.getG(rgbData[i]) - Byte.MIN_VALUE;
int b = RgbVal.getB(rgbData[i]) - Byte.MIN_VALUE;
// also darken unmasked pixels
int gray = (r + g + b) / 5;
/* average the values to get the grayvalue
*/
/* Create ARGB word */
rgbData[i] = ((gray) << 16) | ((gray) << 8) | gray;
}
}
return imRgb;
}
/**
* Assigns a constant rectangle to the input Gray8Image, replacing values in the image.
*
* @param image the input image (output replaces input).
* @throws Error if the input is not a Gray8Image.
*/
public void push(Image image) throws Error {
if (!(image instanceof Gray8Image)) {
throw new Error(
Error.PACKAGE.ALGORITHM, ErrorCodes.IMAGE_NOT_GRAY8IMAGE, image.toString(), null, null);
}
Gray8Image input = (Gray8Image) image;
byte[] data = input.getData();
int nLimitY = Math.min(input.getHeight(), this.cY + this.nHeight);
int nLimitX = Math.min(input.getWidth(), this.cX + this.nWidth);
for (int i = this.cY; i < nLimitY; i++) {
int nStart = i * image.getWidth();
for (int j = this.cX; j < nLimitX; j++) {
data[nStart + j] = this.bValue;
}
}
super.setOutput(input);
}