PrecisionFilter.java

package gdsc.smlm.results.filter;

import com.thoughtworks.xstream.annotations.XStreamAsAttribute;
import com.thoughtworks.xstream.annotations.XStreamOmitField;

/*----------------------------------------------------------------------------- 
 * GDSC SMLM Software
 * 
 * Copyright (C) 2013 Alex Herbert
 * Genome Damage and Stability Centre
 * University of Sussex, UK
 * 
 * This program 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.
 *---------------------------------------------------------------------------*/

import gdsc.smlm.results.MemoryPeakResults;
import gdsc.smlm.results.PeakResult;

/**
 * Filter results using a precision threshold
 */
public class PrecisionFilter extends DirectFilter implements IMultiFilter
{
	public static final double DEFAULT_INCREMENT = 1;
	public static final double DEFAULT_RANGE = 10;
	public static final double UPPER_LIMIT = 70;

	@XStreamAsAttribute
	final double precision;
	@XStreamOmitField
	double variance;
	@XStreamOmitField
	double nmPerPixel = 100;
	@XStreamOmitField
	boolean emCCD = true;
	@XStreamOmitField
	double gain = 1;

	public PrecisionFilter(double precision)
	{
		this.precision = Math.max(0, precision);
	}

	@Override
	public void setup(MemoryPeakResults peakResults)
	{
		variance = Filter.getDUpperSquaredLimit(precision);
		nmPerPixel = peakResults.getNmPerPixel();
		gain = peakResults.getGain();
		emCCD = peakResults.isEMCCD();
	}

	@Override
	public boolean accept(PeakResult peak)
	{
		final double s = nmPerPixel * peak.getSD();
		final double N = peak.getSignal();
		// Use the background noise to estimate precision 
		return PeakResult.getVariance(nmPerPixel, s, N / gain, peak.getNoise() / gain, emCCD) <= variance;
	}

	@Override
	public int validate(final PreprocessedPeakResult peak)
	{
		if (peak.getLocationVariance() > variance)
			return V_LOCATION_VARIANCE;
		return 0;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see gdsc.smlm.results.filter.Filter#getDescription()
	 */
	@Override
	public String getDescription()
	{
		return "Filter results using an upper precision threshold.";
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see gdsc.smlm.results.filter.Filter#getNumberOfParameters()
	 */
	@Override
	public int getNumberOfParameters()
	{
		return 1;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see gdsc.smlm.results.filter.Filter#getParameterValueInternal(int)
	 */
	@Override
	protected double getParameterValueInternal(int index)
	{
		return precision;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see gdsc.smlm.results.filter.Filter#getParameterIncrement(int)
	 */
	@Override
	public double getParameterIncrement(int index)
	{
		checkIndex(index);
		return PrecisionFilter.DEFAULT_INCREMENT;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see gdsc.smlm.results.filter.Filter#getParameterType(int)
	 */
	@Override
	public ParameterType getParameterType(int index)
	{
		checkIndex(index);
		return ParameterType.PRECISION;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see gdsc.smlm.results.filter.Filter#adjustParameter(int, double)
	 */
	@Override
	public Filter adjustParameter(int index, double delta)
	{
		checkIndex(index);
		return new PrecisionFilter(updateParameter(precision, delta, DEFAULT_RANGE));
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see gdsc.smlm.results.filter.Filter#create(double[])
	 */
	@Override
	public Filter create(double... parameters)
	{
		return new PrecisionFilter(parameters[0]);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see gdsc.smlm.results.filter.Filter#weakestParameters(double[])
	 */
	@Override
	public void weakestParameters(double[] parameters)
	{
		setMax(parameters, 0, precision);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see gdsc.smlm.results.filter.DirectFilter#lowerBoundOrientation(int)
	 */
	@Override
	public int lowerBoundOrientation(int index)
	{
		return 1;
	}
	
	/*
	 * (non-Javadoc)
	 * 
	 * @see gdsc.smlm.results.filter.Filter#upperLimit()
	 */
	@Override
	public double[] upperLimit()
	{
		return new double[] { UPPER_LIMIT };
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see gdsc.smlm.ga.Chromosome#mutationStepRange()
	 */
	public double[] mutationStepRange()
	{
		return new double[] { DEFAULT_RANGE };
	}

	public double getSignal()
	{
		return 0;
	}

	public double getSNR()
	{
		return 0;
	}

	public double getMinWidth()
	{
		return 0;
	}

	public double getMaxWidth()
	{
		return 0;
	}

	public double getShift()
	{
		return 0;
	}

	public double getEShift()
	{
		return 0;
	}

	public double getPrecision()
	{
		return precision;
	}

	public boolean isPrecisionUsesLocalBackground()
	{
		return false;
	}
}