[Image] Génération de bruit gaussien/uniforme sur une image

Pour du bruit gaussien :

Code:

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/**
 * @author millie
 *
 */
public class GaussianNoiseGenerator extends ImageOperator {
	private Random gauss = new Random();
	private Random sign = new Random();
 
	private double sigma;
	private double mean;
 
	private double getGaussian() {
		return gauss.nextGaussian() * sigma + mean;
	}
 
	public GaussianNoiseGenerator(double sigma, double mean) {
		this.sigma = sigma;
		this.mean = mean;
	}
 
	/* (non-Javadoc)
	 * @see millie.operator.commons.point.PointOperator#computePoint(double)
	 */
	@Override
	public double computePoint(double point) {
		int s = sign.nextInt(2);
		if(s==0)
			s--;
		return point + getGaussian() * s;
	}
 
}
 
public void compute(Image out, Image in, PointOperator op) {
		if (out.getNumComponents() != in.getNumComponents())
			throw new IllegalArgumentException(
					"PointOperator : num components problem");
 
		out.resize(in.getWidth(), in.getHeight());
 
		for (int canal = 0; canal < in.getNumComponents(); canal++)
			for (int y = 0; y < in.getHeight(); y++)
				for (int x = 0; x < in.getWidth(); x++)
					out.setPixel(x, y, canal, op.computePoint(in.getPixel(x, y,
							canal)));
 
	}

Que l'on utilise via :

Code:

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		GaussianNoiseGenerator op = new GaussianNoiseGenerator(10, 0);
		op.compute(out, in);

Pour du bruit Uniforme, compute est identique, mais le reste est :

Code:

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/**
 * @author millie
 *
 */
public class UniformNoiseGenerator extends PointOperator {
	private Random randomizer = new Random();
 
	private int distance;
	private int distance2p1;
 
	public UniformNoiseGenerator(int distance) {
		this.distance = distance;
		distance2p1  = distance*2 +1 ;
	}
	/* (non-Javadoc)
	 * @see millie.operator.commons.point.PointOperator#computePoint(double)
	 */
	@Override
	public double computePoint(double point) {
		int value = randomizer.nextInt(distance2p1 ) - distance;
 
		return value + point;
	}
 
}

PRomu@ld : sources