src/qvworkers/qvimageretarderworker.h

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00001 /*
00002  *      Copyright (C) 2007, 2008. PARP Research Group.
00003  *      <http://perception.inf.um.es>
00004  *      University of Murcia, Spain.
00005  *
00006  *      This file is part of the QVision library.
00007  *
00008  *      QVision is free software: you can redistribute it and/or modify
00009  *      it under the terms of the GNU Lesser General Public License as
00010  *      published by the Free Software Foundation, version 3 of the License.
00011  *
00012  *      QVision is distributed in the hope that it will be useful,
00013  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  *      GNU Lesser General Public License for more details.
00016  *
00017  *      You should have received a copy of the GNU Lesser General Public
00018  *      License along with QVision. If not, see <http://www.gnu.org/licenses/>.
00019  */
00020 
00024 
00025 #ifndef QVIMAGERETARDER_H
00026 #define QVIMAGERETARDER_H
00027 
00028 #include <QVImage>
00029 #include <QVWorker>
00030 
00032 #ifndef DOXYGEN_IGNORE_THIS
00033 template <typename T, int C> class QVImageRetarderWorker: public QVWorker
00034         {
00035         private:
00036                 QList< QVImage<T,C> > imageCache;
00037 
00038         public:
00039                 QVImageRetarderWorker(QString name, const int defaultRetardedFrames = 30, const int minRetardedFrames = 0, const int maxRetardedFrames = 255): QVWorker(name)
00040                         {
00041                         // Input properties
00042                         addProperty< QVImage<T,C> >("Input image", inputFlag|outputFlag);
00043                         addProperty< int >("Second image delay", inputFlag|outputFlag, defaultRetardedFrames, "Number of frames from the input image to the second", minRetardedFrames, maxRetardedFrames);
00044 
00045                         // Output image
00046                         addProperty< QVImage<T,C> >("Output image", outputFlag);
00047                         }
00048 
00049                 void iterate()
00050                         {
00051                         // 0. Read input property values.
00052                         const QVImage<T,C> image = getPropertyValue< QVImage<uChar,C> >("Input image");
00053                         const int secondImageDelay = getPropertyValue<int>("Second image delay");
00054 
00055                         // 2. Insert new image in image cache
00056                         imageCache.append(image);
00057 
00058                         // 3. Write output image
00059                         setPropertyValue< QVImage<T,C> >("Output image", imageCache.front());
00060 
00061                         // 4. Keep a maximum size for image cache
00062                         while (imageCache.size() > secondImageDelay)
00063                                 imageCache.removeFirst();
00064                         }
00065         };
00066 #endif
00067 #endif