Page MenuHomec4science
Files F69720272

VanCittert.java
No OneTemporary
Actions

File Metadata

Created
Wed, Jul 3, 04:11

VanCittert.java
View Options

/*
* DeconvolutionLab2
*
* Conditions of use: You are free to use this software for research or
* educational purposes. In addition, we expect you to include adequate
* citations and acknowledgments whenever you present or publish results that
* are based on it.
*
* Reference: DeconvolutionLab2: An Open-Source Software for Deconvolution
* Microscopy D. Sage, L. Donati, F. Soulez, D. Fortun, G. Schmit, A. Seitz,
* R. Guiet, C. Vonesch, M Unser, Methods of Elsevier, 2017.
*/
/*
* Copyright 2010-2017 Biomedical Imaging Group at the EPFL.
*
* This file is part of DeconvolutionLab2 (DL2).
*
* DL2 is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* DL2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* DL2. If not, see <http://www.gnu.org/licenses/>.
*/
package deconvolution.algorithm;
import java.util.concurrent.Callable;
import signal.ComplexSignal;
import signal.Operations;
import signal.RealSignal;
public class VanCittert extends AbstractAlgorithm implements Callable<RealSignal> {
private double gamma = 1.0;
public VanCittert(int iter, double gamma) {
super();
controller.setIterationMax(iter);
this.gamma = gamma;
}
@Override
// VAnCitter algorithm
// X(n+1) = X(n) + g*(Y-H*X(n))
// => X(n+1) = X(n) - g*H*X(n) + g*Y
// => X(n+1) = X(n) * (I-g*H) + g*Y
// => pre-compute: A = (I-g*H) and G = g*Y
// => Iteration : X(n+1) = X(n) * A + G with F(0) = G
public RealSignal call() {
ComplexSignal Y = fft.transform(y);
ComplexSignal H = fft.transform(h);
ComplexSignal A = Operations.delta1(gamma, H);
ComplexSignal G = Operations.multiply(gamma, Y);
ComplexSignal X = G.duplicate();
while(!controller.ends(X)) {
X.times(A);
X.plus(G);
}
RealSignal x = fft.inverse(X);
return x;
}
@Override
public String getName() {
return "Van Cittert";
}
@Override
public String getShortname() {
return "VC";
}
@Override
public boolean isRegularized() {
return false;
}
@Override
public boolean isStepControllable() {
return true;
}
@Override
public boolean isIterative() {
return true;
}
@Override
public boolean isWaveletsBased() {
return false;
}
@Override
public void setParameters(double[] params) {
if (params == null)
return;
if (params.length > 0)
controller.setIterationMax((int)Math.round(params[0]));
if (params.length > 1)
gamma = (float)params[1];
}
@Override
public double[] getDefaultParameters() {
return new double[] {10, 1};
}
@Override
public double[] getParameters() {
return new double[] {controller.getIterationMax(), gamma};
}
@Override
public double getRegularizationFactor() {
return 0.0;
}
@Override
public double getStepFactor() {
return gamma;
}
}

Event Timeline

c4science · Help