PARP Research Group

Universidad de Murcia

---

examples/features/features.cpp Go to the documentation of this file. /* * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012. PARP Research Group. * <http://perception.inf.um.es> * University of Murcia, Spain. * * This file is part of the QVision library. * * QVision is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation, version 3 of the License. * * QVision is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with QVision. If not, see <http://www.gnu.org/licenses/>. */ #include <stdio.h> #include <stdlib.h> #include <iostream> #include <QDebug> #include <qvip.h> #include <QVApplication> #include <QVVideoReaderBlock> #include <QVDefaultGUI> #include <QVImageCanvas> #include <QVPolyline> #include <QVHarrisPointDetector> #include <QVCannyEdgeDetector> #include <QVMSERDetector> #include <QVNumericPlot> #include <QVHistogramPlot> #ifndef DOXYGEN_IGNORE_THIS class ContourExtractorBlock: public QVProcessingBlock { public: ContourExtractorBlock(QString name = QString()): QVProcessingBlock(name) { addProperty<int>("Threshold", inputFlag, 128, "Threshold for a point to count as pertaining to a region", 0, 255); addProperty<int>("MinAreaIPE", inputFlag, 0, "Minimal area to keep points in the IPE algorithm", 0, 50); addProperty< QVImage<uChar,3> >("Input image", inputFlag|outputFlag); addProperty< QList<QVPolyline> >("Internal contours", outputFlag); addProperty< QList<QVPolyline> >("External contours", outputFlag); } void iterate() { // 0. Read input parameters const QVImage<uChar,1> image = getPropertyValue< QVImage<uChar,3> >("Input image"); const uInt rows = image.getRows(), cols = image.getCols(), threshold = getPropertyValue< int >("Threshold"), minAreaIPE = getPropertyValue< int >("MinAreaIPE"); timeFlag("Read input parameters"); // 1. Get contours from image const QList<QVPolyline> contours = getConnectedSetBorderContoursThreshold(image, threshold); timeFlag("Get contours from image"); // 2. Apply IPE QList<QVPolyline> ipeContours; foreach(QVPolyline polyline, contours) { QVPolyline ipePolyline; IterativePointElimination(polyline, ipePolyline, minAreaIPE); if (ipePolyline.size() > 0) ipeContours.append(ipePolyline); } timeFlag("IPE filtering"); // 3. Export contours to output property QList<QVPolyline> internalContours, externalContours; foreach(QVPolyline polyline, ipeContours) if (polyline.direction) internalContours.append(polyline); else externalContours.append(polyline); setPropertyValue< QList< QVPolyline> >("Internal contours",internalContours); setPropertyValue< QList< QVPolyline> >("External contours",externalContours); timeFlag("Computed output contours"); } }; int main(int argc, char *argv[]) { ippSetNumThreads(1); QVApplication app(argc, argv, "Example program for QVision library. Obtains several features from input video frames." ); ContourExtractorBlock contoursBlock("Contours Extractor Block"); QVCannyEdgeDetector cannyBlock("Canny Operator Block"); QVHarrisPointDetector cornersBlock("Harris Block"); QVMSERDetector mserBlock("MSER Block"); QVVideoReaderBlock videoReader("Video reader"); videoReader.linkProperty(&contoursBlock,"Input image"); videoReader.linkProperty(&cannyBlock,"Input image"); videoReader.linkProperty(&cornersBlock,"Input image"); videoReader.linkProperty(&mserBlock,"Input image"); QVDefaultGUI interface; QVImageCanvas contourCanvas("Contours"); contoursBlock.linkProperty("Input image", contourCanvas); contoursBlock.linkProperty("Internal contours", contourCanvas); contoursBlock.linkProperty("External contours", contourCanvas); contourCanvas.setPropertyValue<QColor>("Color for External contours", Qt::blue); QVImageCanvas cannyCanvas("Canny"); cannyBlock.linkProperty("Output image", cannyCanvas); QVImageCanvas cornersCanvas("Harris corners displayer"); cornersBlock.linkProperty("Input image", cornersCanvas); cornersBlock.linkProperty("Feature locations", cornersCanvas); QVImageCanvas mserCanvas("MSER Regions displayer"); mserBlock.linkProperty("Input image", mserCanvas); mserBlock.linkProperty("MSER contours", mserCanvas); return app.exec(); } #endif

---

QVision framework. PARP research group. Copyright © 2007, 2008, 2009, 2010, 2011.