001/*******************************************************************************
002 * This software is provided as a supplement to the authors' textbooks on digital
003 * image processing published by Springer-Verlag in various languages and editions.
004 * Permission to use and distribute this software is granted under the BSD 2-Clause
005 * "Simplified" License (see http://opensource.org/licenses/BSD-2-Clause).
006 * Copyright (c) 2006-2023 Wilhelm Burger, Mark J. Burge. All rights reserved.
007 * Visit https://imagingbook.com for additional details.
008 ******************************************************************************/
009package Ch02_Histograms_Statistics;
010
011import ij.ImagePlus;
012import ij.plugin.filter.PlugInFilter;
013import ij.process.ImageProcessor;
014import imagingbook.common.histogram.HistogramPlot;
015import imagingbook.common.histogram.HistogramUtils;
016import imagingbook.common.ij.DialogUtils;
017import imagingbook.core.jdoc.JavaDocHelp;
018import imagingbook.sampleimages.GeneralSampleImage;
019
020import static imagingbook.common.ij.IjUtils.noCurrentImage;
021
022/**
023 * ImageJ plugin, simply displays the histogram and cumulative histogram of a grayscale image in two new windows.
024 * Everything is done by built-in methods, nothing is calculated in this plugin itself. The input image is not
025 * modified.
026 *
027 * @author WB
028 * @see HistogramUtils
029 * @see HistogramPlot
030 */
031public class Show_Histogram implements PlugInFilter, JavaDocHelp {
032        
033        private ImagePlus im;
034
035        /** Constructor, asks to open a predefined sample image if no other image is currently open. */
036        public Show_Histogram() {
037                if (noCurrentImage()) {
038                        DialogUtils.askForSampleImage(GeneralSampleImage.IrishManor);
039                }
040        }
041        
042        @Override
043        public int setup(String arg0, ImagePlus im) {
044                this.im = im;
045                return DOES_8G + NO_CHANGES;
046        }
047        
048        @Override
049        public void run(ImageProcessor ip) {
050                int[] h = ip.getHistogram();
051                String title = im.getShortTitle();
052                new HistogramPlot(h, "Histogram of " + title).show();
053                new HistogramPlot(HistogramUtils.cdf(h), "Cum. Histogram of " + title).show();
054        }
055        
056}
057