PARP Research Group

Universidad de Murcia

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src/qvblockprogramming/qvprocessingblocks/qvcannyedgedetector.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 <qvip.h> #include <qvipp.h> #include <QVPolyline> #include <QVCannyEdgeDetector> #ifndef DOXYGEN_IGNORE_THIS QVCannyEdgeDetector::QVCannyEdgeDetector(QString name): QVProcessingBlock(name) { addProperty<double>("cannyHigh", inputFlag, 150, "High threshold for Canny operator", 50, 1000); addProperty<double>("cannyLow", inputFlag, 50, "Low threshold for Canny operator", 10, 500); addProperty<bool>("applyIPE", inputFlag, FALSE, "If we want to apply the IPE algorithm"); addProperty<double>("paramIPE", inputFlag, 5.0, "IPE parameter (max. allowed distance to line)", 1.0, 25.0); addProperty<bool>("intersectLines", inputFlag, TRUE, "If we want IPE to postprocess polyline (intersecting lines)"); addProperty<int>("minLengthContour", inputFlag, 25, "Minimal length of a contour to be considered", 1, 150); //addProperty<int>("showNothingCannyImage", inputFlag, 0, "If we want nothing|Canny|original image to be shown",0,2); //addProperty<bool>("showContours", inputFlag, TRUE, "If we want contours to be shown"); addProperty< QVImage<uChar,1> >("Output image", outputFlag); addProperty< QVImage<uChar,3> >("Input image", inputFlag|outputFlag); addProperty< QList<QVPolyline> >("Output contours", outputFlag); } void QVCannyEdgeDetector::iterate() { // 0. Read input parameters const double cannyHigh = getPropertyValue<double>("cannyHigh"); const double cannyLow = getPropertyValue<double>("cannyLow"); const bool applyIPE = getPropertyValue<bool>("applyIPE"); const double paramIPE = getPropertyValue<double>("paramIPE"); const bool intersectLines = getPropertyValue<bool>("intersectLines"); const int minLengthContour = getPropertyValue<int>("minLengthContour"); //const int showNothingCannyImage = getPropertyValue<int>("showNothingCannyImage"); //const bool showContours = getPropertyValue<bool>("showContours"); const QVImage<uChar,1> image = getPropertyValue< QVImage<uChar,3> >("Input image"); const uInt cols = image.getCols(), rows = image.getRows(); QVImage<sFloat> imageFloat(cols, rows), dX(cols, rows), dY(cols, rows), dXNeg(cols, rows); QVImage<uChar> canny(cols, rows), buffer; // 1. Convert image from uChar to sShort Convert(image, imageFloat); timeFlag("Convert image from uChar to sShort"); // 2. Obtain horizontal and vertical gradients from image FilterSobelHorizMask(imageFloat,dY); FilterSobelVertMask(imageFloat,dX); MulC(dX, -1, dXNeg); timeFlag("Obtain horizontal and vertical gradients from image"); // 3. Apply Canny operator CannyGetSize(canny, buffer); Canny(dXNeg, dY, canny, cannyLow,cannyHigh, buffer); timeFlag("Apply Canny operator"); // 4. Get contours const QList<QVPolyline> contourList = getLineContoursThreshold8Connectivity(canny, 128); timeFlag("Get contours"); QList<QVPolyline> outputList; foreach(QVPolyline contour,contourList) if(contour.size() > minLengthContour) { #ifdef QVMATRIXALGEBRA_AVAILABLE if(applyIPE) { QVPolyline IPEcontour; IterativePointElimination(contour, IPEcontour, paramIPE, FALSE, intersectLines); outputList.append(IPEcontour); } else #endif // QVMATRIXALGEBRA_AVAILABLE outputList.append(contour); } timeFlag("IPE on contours"); // 5. Publish resulting data // Always show Canny image. //if(showNothingCannyImage == 1) setPropertyValue< QVImage<uChar,1> >("Output image",canny); //else if(showNothingCannyImage == 2) // setPropertyValue< QVImage<uChar,1> >("Output image",image); /*else { QVImage<uChar> whiteImage(cols, rows); Set(255, whiteImage); setPropertyValue< QVImage<uChar,1> >("Output image",whiteImage); }*/ //if(showContours) // Always publish contour list setPropertyValue< QList< QVPolyline> >("Output contours",outputList); //else //setPropertyValue< QList< QVPolyline> >("Output contours",QList<QVPolyline>()); timeFlag("Publish results"); } #endif

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