Java tutorial
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. */ /** * houghLines (OpenCV3.1). */ public class OCV_HoughLines 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 divDist = 0; private static double divAng = 0; private static double minDeg = 0; private static double maxDeg = 360; 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("divisor_distance", divDist, 4); gd.addNumericField("devisor_angle", divAng, 4); gd.addNumericField("min_angle", minDeg, 4); gd.addNumericField("max_angle", maxDeg, 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(); divDist = (double) gd.getNextNumber(); divAng = (double) gd.getNextNumber(); minDeg = (double) gd.getNextNumber(); maxDeg = (double) gd.getNextNumber(); enAddRoi = gd.getNextBoolean(); if (Double.isNaN(resDist) || Double.isNaN(resAngFact) || Double.isNaN(divDist) || Double.isNaN(divAng) || Double.isNaN(minDeg) || Double.isNaN(maxDeg)) { 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 (divDist < 0) { IJ.showStatus("'0 <= divisor_distance' is necessary."); return false; } if (divAng < 0) { IJ.showStatus("'0 <= devisor_angle' is necessary."); return false; } if (minDeg < 0) { IJ.showStatus("'0 <= min_angle' is necessary."); return false; } if (maxDeg < 0) { IJ.showStatus("'0 <= max_angle' is necessary."); return false; } if (360 < minDeg) { IJ.showStatus("'min_angle <= 360' is necessary."); return false; } if (360 < maxDeg) { IJ.showStatus("'max_angle <= 360' is necessary."); return false; } if (maxDeg < minDeg) { IJ.showStatus("'min_angle <= max_angle' is necessary."); return false; } IJ.showStatus("OCV_HoughLines"); 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); double resAng = CV_PI / resAngFact; double minTheta = CV_PI / 360.0 * minDeg; double maxTheta = CV_PI / 360.0 * maxDeg; Imgproc.HoughLines(src_mat, dst_lines, resDist, resAng, minVotes, divDist, divAng, minTheta, maxTheta); // fin showData(dst_lines, imw, imh); } // private private void showData(Mat lines, int imw, int imh) { // 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(); float[] res = new float[2]; for (int i = 0; i < num_lines; i++) { lines.get(i, 0, res); float rho = res[0]; float theta = res[1]; double a = Math.cos(theta); double b = Math.sin(theta); double x0 = a * rho; double y0 = b * rho; double z = imw < imh ? imh : imw; double x1 = x0 + z * (-b); double y1 = y0 + z * a; double x2 = x0 - z * (-b); double y2 = y0 - z * (a); rt.incrementCounter(); rt.addValue("rho", rho); rt.addValue("theta", theta); rt.addValue("z", z); 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"); } }