/**
   * Use the GUI results to set up the variables needed to run the algorithm.
   *
   * @return <code>true</code> if parameters set successfully, <code>false</code> otherwise.
   */
  private boolean setVariables() {
    String tmpStr;

    System.gc();

    if (replaceImage.isSelected()) {
      displayLoc = REPLACE;
    } else if (newImage.isSelected()) {
      displayLoc = NEW;
    }

    tmpStr = textSearchWindowSide.getText();

    if (testParameter(tmpStr, 5, 101)) {
      searchWindowSide = Integer.valueOf(tmpStr).intValue();
    } else {
      MipavUtil.displayError("Search window side must be between 5 and 101");
      textSearchWindowSide.requestFocus();
      textSearchWindowSide.selectAll();

      return false;
    }

    if ((searchWindowSide % 2) == 0) {
      MipavUtil.displayError("Search window side must be an odd number");
      textSearchWindowSide.requestFocus();
      textSearchWindowSide.selectAll();
      return false;
    }

    tmpStr = textSimilarityWindowSide.getText();

    if (testParameter(tmpStr, 3, 99)) {
      similarityWindowSide = Integer.valueOf(tmpStr).intValue();
    } else {
      MipavUtil.displayError("Similarity window side must be between 3 and 99");
      textSimilarityWindowSide.requestFocus();
      textSimilarityWindowSide.selectAll();

      return false;
    }

    if ((similarityWindowSide % 2) == 0) {
      MipavUtil.displayError("Similarity window side must be an odd number");
      textSimilarityWindowSide.requestFocus();
      textSimilarityWindowSide.selectAll();
      return false;
    }

    if (similarityWindowSide >= searchWindowSide) {
      MipavUtil.displayError("Similarity window side must be less than search window side");
      textSimilarityWindowSide.requestFocus();
      textSimilarityWindowSide.selectAll();
      return false;
    }

    tmpStr = textNoiseStandardDeviation.getText();

    if (testParameter(tmpStr, 0.001, 1000.0)) {
      noiseStandardDeviation = Float.valueOf(tmpStr).floatValue();
    } else {
      MipavUtil.displayError("Radius must be between 0.001 and 1000.0");
      textNoiseStandardDeviation.requestFocus();
      textNoiseStandardDeviation.selectAll();

      return false;
    }

    doRician = doRicianCheckBox.isSelected();

    if (doRician) {
      tmpStr = textDegree.getText();
      if (testParameter(tmpStr, 1.0, 10.0)) {
        degreeOfFiltering = Float.valueOf(tmpStr).floatValue();
      } else {
        MipavUtil.displayError("Degree of filtering must be between 1.0 and 10.0");
        textDegree.requestFocus();
        textDegree.selectAll();
      }
    }

    if (image.getNDims() > 2) {
      image25D = image25DCheckBox.isSelected();
    }

    return true;
  }
  /**
   * Initializes the GUI by creating the components, placing them in the dialog, and displaying
   * them.
   */
  private void init() {
    setForeground(Color.black);

    setTitle("Nonlocal Means Filter");

    JPanel mainPanel;
    mainPanel = new JPanel();
    mainPanel.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));
    mainPanel.setLayout(new GridBagLayout());

    GridBagConstraints gbc = new GridBagConstraints();
    gbc.gridwidth = 1;
    gbc.gridheight = 1;
    gbc.anchor = GridBagConstraints.WEST;
    gbc.weightx = 1;
    gbc.insets = new Insets(3, 3, 3, 3);
    gbc.gridx = 0;
    gbc.gridy = 0;
    gbc.fill = GridBagConstraints.HORIZONTAL;

    paramPanel = new JPanel(new GridBagLayout());
    paramPanel.setForeground(Color.black);
    paramPanel.setBorder(buildTitledBorder("Parameters"));
    mainPanel.add(paramPanel, gbc);

    GridBagConstraints gbc2 = new GridBagConstraints();
    gbc2.gridwidth = 1;
    gbc2.gridheight = 1;
    gbc2.anchor = GridBagConstraints.WEST;
    gbc2.weightx = 1;
    gbc2.insets = new Insets(3, 3, 3, 3);
    gbc2.gridx = 0;
    gbc2.gridy = 0;
    gbc2.fill = GridBagConstraints.HORIZONTAL;

    labelSearchWindowSide = createLabel("Search window side (odd)");

    paramPanel.add(labelSearchWindowSide, gbc2);

    gbc2.gridx = 1;
    textSearchWindowSide = createTextField("15");
    paramPanel.add(textSearchWindowSide, gbc2);

    gbc2.gridx = 0;
    gbc2.gridy = 1;
    labelSimilarityWindowSide = createLabel("Similarity window side (odd) ");
    paramPanel.add(labelSimilarityWindowSide, gbc2);

    gbc2.gridx = 1;
    textSimilarityWindowSide = createTextField("7");
    paramPanel.add(textSimilarityWindowSide, gbc2);

    gbc2.gridx = 0;
    gbc2.gridy = 2;
    labelNoiseStandardDeviation = createLabel("Noise standard deviation ");
    paramPanel.add(labelNoiseStandardDeviation, gbc2);

    gbc2.gridx = 1;
    textNoiseStandardDeviation = createTextField("10.0");
    paramPanel.add(textNoiseStandardDeviation, gbc2);

    gbc2.gridx = 0;
    gbc2.gridy = 3;
    labelDegree = createLabel("Degree of filtering ");
    labelDegree.setEnabled(doRician);
    paramPanel.add(labelDegree, gbc2);

    gbc2.gridx = 1;
    textDegree = createTextField("1.414");
    textDegree.setEnabled(doRician);
    paramPanel.add(textDegree, gbc2);

    gbc2.gridx = 0;
    gbc2.gridy = 4;
    doRicianCheckBox = new JCheckBox("Deal with Rician noise in MRI");
    doRicianCheckBox.setFont(serif12);
    doRicianCheckBox.setSelected(false);
    doRicianCheckBox.addActionListener(this);
    paramPanel.add(doRicianCheckBox, gbc2);

    if (image.getNDims() > 2) {
      gbc2.gridx = 0;
      gbc2.gridy = 5;
      gbc2.gridwidth = 2;

      image25DCheckBox = new JCheckBox("Process each slice independently (2.5D)");
      image25DCheckBox.setFont(serif12);
      paramPanel.add(image25DCheckBox, gbc2);
      image25DCheckBox.setSelected(false);
    } // if (image.getNDims > 2)

    JPanel outputOptPanel = new JPanel(new GridLayout(1, 2));
    destinationPanel = new JPanel(new BorderLayout());
    destinationPanel.setForeground(Color.black);
    destinationPanel.setBorder(buildTitledBorder("Destination"));
    outputOptPanel.add(destinationPanel);

    destinationGroup = new ButtonGroup();
    newImage = new JRadioButton("New image", true);
    newImage.setBounds(10, 16, 120, 25);
    newImage.setFont(serif12);
    destinationGroup.add(newImage);
    destinationPanel.add(newImage, BorderLayout.NORTH);

    replaceImage = new JRadioButton("Replace image", false);
    replaceImage.setFont(serif12);
    destinationGroup.add(replaceImage);
    destinationPanel.add(replaceImage, BorderLayout.CENTER);

    // Only if the image is unlocked can it be replaced.
    if (image.getLockStatus() == ModelStorageBase.UNLOCKED) {
      replaceImage.setEnabled(true);
    } else {
      replaceImage.setEnabled(false);
    }

    gbc.gridx = 0;
    gbc.gridy = 1;
    mainPanel.add(outputOptPanel, gbc);

    mainDialogPanel.add(mainPanel, BorderLayout.CENTER);
    mainDialogPanel.add(buildButtons(), BorderLayout.SOUTH);

    getContentPane().add(mainDialogPanel);

    pack();
    setResizable(true);
    // setVisible(true);

    System.gc();
  }