/*
* RgbGray8ApplyMask.java
* Shows a mask on an RgbImage by making all the unmasked pixels gray.
* This is not a pipeline stage since it takes two images.
*
* Created on August 27, 2006, 9:02 AM
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*
* Copyright 2007 by Jon A. Webb
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the Lesser GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package jjil.algorithm;
import jjil.core.Error;
import jjil.core.Gray8Image;
import jjil.core.RgbImage;
import jjil.core.RgbVal;
/** RgbGray8ApplyMask shows a mask on an RgbImage by making all the unmasked pixels gray.
* This is not a pipeline stage since it takes two images.
* @author webb
*/
public class RgbGray8ApplyMask {
/** Creates a new instance of RgbGray8ApplyMask */
public RgbGray8ApplyMask() {
}
/**
* 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 jjil.core.Error if the input sizes do not match
*/
public RgbImage push(
RgbImage imRgb,
Gray8Image imMask) throws jjil.core.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;
}
}