OCV_HoughLinesP.java Source code

Introduction

Here is the source code for OCV_HoughLinesP.java

Source

import ij.*;
import ij.gui.DialogListener;
import ij.gui.GenericDialog;
import ij.gui.Line;
import ij.measure.ResultsTable;
import ij.plugin.filter.*;
import ij.plugin.frame.RoiManager;
import ij.process.*;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.imgproc.Imgproc;
import java.awt.AWTEvent;

/*
 * The MIT License
 *
 * Copyright 2016 Takehito Nishida.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

/**
 * houghLinesP (OpenCV3.1).
 */
public class OCV_HoughLinesP implements ExtendedPlugInFilter, DialogListener {
    // constant var.
    private static final int FLAGS = DOES_8G;
    private static final double CV_PI = 3.1415926535897932384626433832795;

    // static var.
    private static double resDist = 1;
    private static double resAngFact = 180;
    private static int minVotes = 1;
    private static double minLen = 1;
    private static double maxGap = 1;
    private static boolean enAddRoi = true;

    @Override
    public int showDialog(ImagePlus imp, String cmd, PlugInFilterRunner pfr) {
        GenericDialog gd = new GenericDialog(cmd.trim() + "...");

        gd.addNumericField("distance_resolution", resDist, 4);
        gd.addMessage("angle_resolution = CV_PI / angle_resolution_factor");
        gd.addNumericField("angle_resolution_factor", resAngFact, 4);
        gd.addNumericField("min_votes", minVotes, 0);
        gd.addNumericField("min_length", minLen, 4);
        gd.addNumericField("max_allowed_gap", maxGap, 4);
        gd.addCheckbox("enable_add_roi", enAddRoi);
        gd.addDialogListener(this);

        gd.showDialog();

        if (gd.wasCanceled()) {
            return DONE;
        } else {
            return FLAGS;
        }
    }

    @Override
    public boolean dialogItemChanged(GenericDialog gd, AWTEvent awte) {
        resDist = (double) gd.getNextNumber();
        resAngFact = (double) gd.getNextNumber();
        minVotes = (int) gd.getNextNumber();
        minLen = (double) gd.getNextNumber();
        maxGap = (double) gd.getNextNumber();
        enAddRoi = gd.getNextBoolean();

        if (Double.isNaN(resDist) || Double.isNaN(resAngFact) || Double.isNaN(minLen) || Double.isNaN(maxGap)) {
            IJ.showStatus("ERR : NaN");
            return false;
        }
        if (resDist < 0) {
            IJ.showStatus("'0 <= distance_resolution' is necessary.");
            return false;
        }
        if (resAngFact < 0) {
            IJ.showStatus("'0 <= angle_resolution_factor' is necessary.");
            return false;
        }
        if (minVotes < 0) {
            IJ.showStatus("'0 <= min_votes' is necessary.");
            return false;
        }
        if (minLen < 0) {
            IJ.showStatus("'0 <= min_length' is necessary.");
            return false;
        }
        if (maxGap < 0) {
            IJ.showStatus("'0 <= max_allowed_gap' is necessary.");
            return false;
        }

        IJ.showStatus("OCV_HoughLinesP");
        return true;
    }

    @Override
    public void setNPasses(int arg0) {
        //do nothing
    }

    @Override
    public int setup(String arg0, ImagePlus imp) {
        if (!OCV__LoadLibrary.isLoad()) {
            IJ.error("Library is not loaded.");
            return DONE;
        }

        if (imp == null) {
            IJ.noImage();
            return DONE;
        } else {
            return DOES_8G;
        }
    }

    @Override
    public void run(ImageProcessor ip) {
        // src
        int imw = ip.getWidth();
        int imh = ip.getHeight();
        byte[] src_ar = (byte[]) ip.getPixels();

        // mat
        Mat src_mat = new Mat(imh, imw, CvType.CV_8UC1);
        Mat dst_lines = new Mat();

        // run
        src_mat.put(0, 0, src_ar);
        Imgproc.HoughLinesP(src_mat, dst_lines, resDist, CV_PI / resAngFact, minVotes, minLen, maxGap);

        // fin
        showData(dst_lines);
    }

    // private
    private void showData(Mat lines) {
        // prepare the ResultsTable
        ResultsTable rt = OCV__LoadLibrary.GetResultsTable(true);

        // prepare the ROI Manager
        RoiManager roiMan = null;

        if (enAddRoi) {
            roiMan = OCV__LoadLibrary.GetRoiManager(true, true);
        }

        // show
        int num_lines = lines.rows();
        int[] line = new int[4];

        for (int i = 0; i < num_lines; i++) {
            lines.get(i, 0, line);

            int x1 = line[0];
            int y1 = line[1];
            int x2 = line[2];
            int y2 = line[3];

            rt.incrementCounter();
            rt.addValue("x1", x1);
            rt.addValue("y1", y1);
            rt.addValue("x2", x2);
            rt.addValue("y2", y2);

            if (enAddRoi && (roiMan != null)) {
                Line roi = new Line(x1, y1, x2, y2);
                roiMan.addRoi(roi);
            }
        }

        rt.show("Results");
    }
}