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 ImageJ_Demos;
010
011import ij.ImagePlus;
012import ij.gui.Roi;
013import ij.plugin.filter.PlugInFilter;
014import ij.process.ImageProcessor;
015import imagingbook.core.jdoc.JavaDocHelp;
016
017import java.awt.Rectangle;
018
019/**
020 * This ImageJ plugin shows how an image operation can be confined to the currently selected region of interest (ROI).
021 * Note that it uses the ROI attached to the associated {@link ImagePlus} instance, which may be of any shape (not just
022 * a rectangle). The plugin works for RGB color images and merely inverts the each pixel contained in the ROI.
023 *
024 * @author WB
025 * @version 2022/04/01
026 */
027public class Roi_Processing_Demo1 implements PlugInFilter, JavaDocHelp {
028
029        private ImagePlus im = null;
030
031        public int setup(String arg, ImagePlus im) {
032                this.im = im;
033                return DOES_RGB + ROI_REQUIRED;
034        }
035
036        public void run(ImageProcessor ip) {
037                // The ROI obtained from ImagePlus may be of any type:
038                Roi roi = im.getRoi();  
039                Rectangle bounds = roi.getBounds();
040
041                int rL = bounds.x;
042                int rT = bounds.y;
043                int rR = rL + bounds.width;
044                int rB = rT + bounds.height;
045
046                // Scan the rectangle and process all pixels inside the ROI:
047                for (int v = rT; v < rB; v++) {
048                        for (int u = rL; u < rR; u++) {
049                                if (roi.contains(u, v)) {
050                                        int p = ip.getPixel(u, v);
051                                        ip.putPixel(u, v, ~p);  // invert color values
052                                }
053                        }
054                }
055        }
056}