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

#include <stdio.h>

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"
			"\nCall:\n"
			"./mser_sample <path_and_image_filename, Default is 'puzzle.png'>\n\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, char** argv )
{
	char path[1024];
	IplImage* img;
	help();
	if (argc!=2)
	{
		strcpy(path,"puzzle.png");
		img = cvLoadImage( path, CV_LOAD_IMAGE_GRAYSCALE );
		if (!img)
		{
			printf("\nUsage: mser_sample <path_to_image>\n");
			return 0;
		}
	}
	else
	{
		strcpy(path,argv[1]);
		img = cvLoadImage( path, CV_LOAD_IMAGE_GRAYSCALE );
	}
	
	if (!img)
	{
		printf("Unable to load image %s\n",path);
		return 0;
	}
	IplImage* rsp = cvLoadImage( path, 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);
	
}