opencv/samples/c/mser_sample.cpp

/* This sample code was originally provided by Liu Liu
 * Copyright<EFBFBD> 2009, Liu Liu All rights reserved.
 */

#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/features2d/features2d.hpp"
#include "opencv2/imgproc/imgproc_c.h"

#include <iostream>

using namespace std;
using namespace cv;

void help()
{
    printf("\nThis program demonstrates the Maximal Extremal Region interest point detector.\n"
           "It finds the most stable (in size) dark and white regions as a threshold is increased.\n"
           "\n Usage: \n"
           "./mser_sample [--image_filename] <path_and_image_filename, default is 'puzzle.png'> \n");
}

static CvScalar colors[] = 
{
    {{0,0,255}},
    {{0,128,255}},
    {{0,255,255}},
    {{0,255,0}},
    {{255,128,0}},
    {{255,255,0}},
    {{255,0,0}},
    {{255,0,255}},
    {{255,255,255}},
    {{196,255,255}},
    {{255,255,196}}
};

static uchar bcolors[][3] = 
{
    {0,0,255},
    {0,128,255},
    {0,255,255},
    {0,255,0},
    {255,128,0},
    {255,255,0},
    {255,0,0},
    {255,0,255},
    {255,255,255}
};


int main( int argc, const char** argv )
{
    help();

    CommandLineParser parser(argc, argv);

    string imageFileName = parser.get<string>("image_filename", "puzzle.png");

    IplImage* img;

    img = cvLoadImage( imageFileName.c_str(), CV_LOAD_IMAGE_GRAYSCALE );
    if (!img)
    {
        printf("Unable to load image %s\n",imageFileName.c_str());
        help();
        return 0;
    }

    IplImage* rsp = cvLoadImage( imageFileName.c_str(), CV_LOAD_IMAGE_COLOR );
    IplImage* ellipses = cvCloneImage(rsp);
    cvCvtColor(img,ellipses,CV_GRAY2BGR);
    CvSeq* contours;
    CvMemStorage* storage= cvCreateMemStorage();
    IplImage* hsv = cvCreateImage( cvGetSize( rsp ), IPL_DEPTH_8U, 3 );
    cvCvtColor( rsp, hsv, CV_BGR2YCrCb );
    CvMSERParams params = cvMSERParams();//cvMSERParams( 5, 60, cvRound(.2*img->width*img->height), .25, .2 );

    double t = (double)cvGetTickCount();
    cvExtractMSER( hsv, NULL, &contours, storage, params );
    t = cvGetTickCount() - t;
    printf( "MSER extracted %d contours in %g ms.\n", contours->total, t/((double)cvGetTickFrequency()*1000.) );
    uchar* rsptr = (uchar*)rsp->imageData;
    // draw mser with different color
    for ( int i = contours->total-1; i >= 0; i-- )
    {
        CvSeq* r = *(CvSeq**)cvGetSeqElem( contours, i );
        for ( int j = 0; j < r->total; j++ )
        {
            CvPoint* pt = CV_GET_SEQ_ELEM( CvPoint, r, j );
            rsptr[pt->x*3+pt->y*rsp->widthStep] = bcolors[i%9][2];
            rsptr[pt->x*3+1+pt->y*rsp->widthStep] = bcolors[i%9][1];
            rsptr[pt->x*3+2+pt->y*rsp->widthStep] = bcolors[i%9][0];
        }
    }
    // find ellipse ( it seems cvfitellipse2 have error or sth?
    for ( int i = 0; i < contours->total; i++ )
    {
        CvContour* r = *(CvContour**)cvGetSeqElem( contours, i );
        CvBox2D box = cvFitEllipse2( r );
        box.angle=(float)CV_PI/2-box.angle;

        if ( r->color > 0 )
            cvEllipseBox( ellipses, box, colors[9], 2 );
        else
            cvEllipseBox( ellipses, box, colors[2], 2 );

    }

    cvSaveImage( "rsp.png", rsp );

    cvNamedWindow( "original", 0 );
    cvShowImage( "original", img );

    cvNamedWindow( "response", 0 );
    cvShowImage( "response", rsp );

    cvNamedWindow( "ellipses", 0 );
    cvShowImage( "ellipses", ellipses );

    cvWaitKey(0);

    cvDestroyWindow( "original" );
    cvDestroyWindow( "response" );
    cvDestroyWindow( "ellipses" );
    cvReleaseImage(&rsp);
    cvReleaseImage(&img);
    cvReleaseImage(&ellipses);
}