/*
* Gray16Threshold.java
*
* Created on September 9, 2006, 10:25 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.Gray16Image;
import jjil.core.Gray8Image;
import jjil.core.Image;
import jjil.core.PipelineStage;
/**
* Threshold. Output is a Gray8Image with values greater than threshold
* set to Byte.MAX_VALUE, below threshold set to Byte.MIN_VALUE. Input
* is a Gray16Image.
* @author webb
*/
public class Gray16Threshold extends PipelineStage {
int nThreshold;
Gray8Image imageOutput = null;
/**
* Creates a new instance of Gray16Threshold
* @param nThreshold the threshold.
*/
public Gray16Threshold(int nThreshold) {
this.nThreshold = nThreshold;
}
/** Threshold gray image. Output is Byte.MAX_VALUE over threshold,
* Byte.MIN_VALUE under.
*
* @param image the input image
* @throws jjil.core.Error if the image is not a Gray16Image.
*/
public void push(Image image)
throws jjil.core.Error
{
if (!(image instanceof Gray16Image)) {
throw new jjil.core.Error(
jjil.core.Error.PACKAGE.ALGORITHM,
jjil.algorithm.ErrorCodes.IMAGE_NOT_GRAY16IMAGE,
image.toString(),
null,
null);
}
if (this.imageOutput == null ||
this.imageOutput.getWidth() != image.getWidth() ||
this.imageOutput.getHeight() != image.getHeight()) {
this.imageOutput = new Gray8Image(
image.getWidth(),
image.getHeight());
}
Gray16Image gray = (Gray16Image) image;
short[] data = gray.getData();
byte[] dataOut = this.imageOutput.getData();
for (int i=0; i<data.length; i++) {
dataOut[i] = (data[i] >= this.nThreshold) ?
Byte.MAX_VALUE : Byte.MIN_VALUE;
}
super.setOutput(this.imageOutput);
}
/**
* Implement toString
* @return a String describing the class instance.
*/
public String toString() {
return super.toString() + "(" + this.nThreshold + ")"; //$NON-NLS-1$ //$NON-NLS-2$
}
}