Shape module added

samples/cpp/shape_example.cpp

@@ -0,0 +1,111 @@
+/*
+ * shape_context.cpp -- Shape context demo for shape matching
+ */
+
+#include "opencv2/shape.hpp"
+#include "opencv2/highgui.hpp"
+#include "opencv2/imgproc.hpp"
+#include <opencv2/core/utility.hpp>
+#include <iostream>
+#include <string>
+
+using namespace std;
+using namespace cv;
+
+static void help()
+{
+    printf("\n"
+            "This program demonstrates a method for shape comparisson based on Shape Context\n"
+            "You should run the program providing a number between 1 and 20 for selecting an image in the folder shape_sample.\n"
+            "Call\n"
+            "./shape_example [number between 1 and 20]\n\n");
+}
+
+static vector<Point> simpleContour( const Mat& currentQuery, int n=300 )
+{
+    vector<vector<Point> > _contoursQuery;
+    vector <Point> contoursQuery;
+    findContours(currentQuery, _contoursQuery, RETR_LIST, CHAIN_APPROX_NONE);
+    for (size_t border=0; border<_contoursQuery.size(); border++)
+    {
+        for (size_t p=0; p<_contoursQuery[border].size(); p++)
+        {
+            contoursQuery.push_back( _contoursQuery[border][p] );
+        }
+    }
+
+    // In case actual number of points is less than n
+    int dummy=0;
+    for (int add=contoursQuery.size()-1; add<n; add++)
+    {
+        contoursQuery.push_back(contoursQuery[dummy++]); //adding dummy values
+    }
+
+    // Uniformly sampling
+    random_shuffle(contoursQuery.begin(), contoursQuery.end());
+    vector<Point> cont;
+    for (int i=0; i<n; i++)
+    {
+        cont.push_back(contoursQuery[i]);
+    }
+    return cont;
+}
+
+int main(int argc, char** argv)
+{
+    help();
+    string path = "./shape_sample/";
+    int indexQuery = 1;
+    if( argc < 2 )
+    {
+        std::cout<<"Using first image as query."<<std::endl;
+    }
+    else
+    {
+        sscanf( argv[1], "%i", &indexQuery );
+    }
+    cv::Ptr <cv::ShapeContextDistanceExtractor> mysc = cv::createShapeContextDistanceExtractor();
+
+    Size sz2Sh(300,300);
+    stringstream queryName;
+    queryName<<path<<indexQuery<<".png";
+    Mat query=imread(queryName.str(), IMREAD_GRAYSCALE);
+    Mat queryToShow;
+    resize(query, queryToShow, sz2Sh);
+    imshow("QUERY", queryToShow);
+    moveWindow("TEST", 0,0);
+    vector<Point> contQuery = simpleContour(query);
+    int bestMatch;
+    float bestDis=FLT_MAX;
+    for ( int ii=1; ii<=20; ii++ )
+    {
+        if (ii==indexQuery) continue;
+        waitKey(30);
+        stringstream iiname;
+        iiname<<path<<ii<<".png";
+        cout<<"name: "<<iiname.str()<<endl;
+        Mat iiIm=imread(iiname.str(), 0);
+        Mat iiToShow;
+        resize(iiIm, iiToShow, sz2Sh);
+        imshow("TEST", iiToShow);
+        moveWindow("TEST", sz2Sh.width+50,0);
+        vector<Point> contii = simpleContour(iiIm);
+        float dis = mysc->computeDistance( contQuery, contii );
+        if ( dis<bestDis )
+        {
+            bestMatch = ii;
+            bestDis = dis;
+        }
+        std::cout<<" distance between "<<queryName.str()<<" and "<<iiname.str()<<" is: "<<dis<<std::endl;
+    }
+    destroyWindow("TEST");
+    stringstream bestname;
+    bestname<<path<<bestMatch<<".png";
+    Mat iiIm=imread(bestname.str(), 0);
+    Mat bestToShow;
+    resize(iiIm, bestToShow, sz2Sh);
+    imshow("BEST MATCH", bestToShow);
+    moveWindow("BEST MATCH", sz2Sh.width+50,0);
+
+    return 0;
+}