Colony

/**

 * fitellipse.c

 * based on opencv's sample program fitellipse.c by Denis Burenkov

 *

 * @author Rich Hong

 * @date 12/05/2007

 */

#ifdef _CH_

#pragma package <opencv>

#endif

#ifndef _EiC

#include "cv.h"

#include "highgui.h"

#endif

#include <stdio.h>

#include <stdlib.h>

int slider_pos = 200;

// Load the source image. HighGUI use.

IplImage *image02 = 0, *image03 = 0, *image04 = 0;

void process_image(int h);

int main( int argc, char** argv ) {

        const char* filename = argc == 2 ? argv[1] : (char*)"colonet.jpg";

        // load image and force it to be grayscale

        if( (image03 = cvLoadImage(filename, 0)) == 0 ) return -1;

        // Create the destination images

        image02 = cvCloneImage( image03 );

        image04 = cvCloneImage( image03 );

        // Create windows.

        cvNamedWindow("Source", 1);

        // Show the image.

        cvShowImage("Source", image03);

        cvNamedWindow("Result", 1);

        // Create toolbars. HighGUI use.

        cvCreateTrackbar( "Threshold", "Result", &slider_pos, 255, process_image );

        process_image(0);

        // Wait for a key stroke; the same function arranges events processing

        cvWaitKey(0);

        cvReleaseImage(&image02);

        cvReleaseImage(&image03);

        cvDestroyWindow("Source");

        cvDestroyWindow("Result");

        return 0;

}

// Define trackbar callback functon. This function find contours,

// draw it and approximate it by ellipses.

void process_image(int h)

{

    CvMemStorage* stor;

    CvSeq* cont;

    CvBox2D32f* box;

    CvPoint* PointArray;

    CvPoint2D32f* PointArray2D32f;

    // Create dynamic structure and sequence.

    stor = cvCreateMemStorage(0);

    cont = cvCreateSeq(CV_SEQ_ELTYPE_POINT, sizeof(CvSeq), sizeof(CvPoint) , stor);

    // Threshold the source image. This needful for cvFindContours().

    cvThreshold( image03, image02, slider_pos, 255, CV_THRESH_BINARY );

    // Find all contours.

    cvFindContours( image02, stor, &cont, sizeof(CvContour), 

                    CV_RETR_LIST, CV_CHAIN_APPROX_NONE, cvPoint(0,0));

    // Clear images. IPL use.

    cvZero(image02);

    cvZero(image04);

    // This cycle draw all contours and approximate it by ellipses.

    for(;cont;cont = cont->h_next)

    {   

        int i; // Indicator of cycle.

        int count = cont->total; // This is number point in contour

        CvPoint center;

        CvSize size;

        // Number point must be more than or equal to 6 (for cvFitEllipse_32f).        

        if( count < 6 )

            continue;

        // Alloc memory for contour point set.    

        PointArray = (CvPoint*)malloc( count*sizeof(CvPoint) );

        PointArray2D32f= (CvPoint2D32f*)malloc( count*sizeof(CvPoint2D32f) );

        // Alloc memory for ellipse data.

        box = (CvBox2D32f*)malloc(sizeof(CvBox2D32f));

        // Get contour point set.

        cvCvtSeqToArray(cont, PointArray, CV_WHOLE_SEQ);

        // Convert CvPoint set to CvBox2D32f set.

        for(i=0; i<count; i++)

        {

            PointArray2D32f[i].x = (float)PointArray[i].x;

            PointArray2D32f[i].y = (float)PointArray[i].y;

        }

        // Fits ellipse to current contour.

        cvFitEllipse(PointArray2D32f, count, box);

        // Draw current contour.

        cvDrawContours(image04,cont,CV_RGB(255,255,255),CV_RGB(255,255,255),0,1,8,cvPoint(0,0));

        // Convert ellipse data from float to integer representation.

        center.x = cvRound(box->center.x);

        center.y = cvRound(box->center.y);

        size.width = cvRound(box->size.width*0.5);

        size.height = cvRound(box->size.height*0.5);

        box->angle = -box->angle;

        if (size.width>10&&size.height>10&&size.width<20&&size.height<20){

                //printf("%d %d %d %d\n",center.x,center.y,size.width,size.height);

                // Draw ellipse.

                       cvEllipse(image04, center, size,

                box->angle, 0, 360,

                CV_RGB(0,0,255), 1, CV_AA, 0);

        }

        // Free memory.          

        free(PointArray);

        free(PointArray2D32f);

        free(box);

    }

    // Show image. HighGUI use.

    cvShowImage( "Result", image04 );

}

#ifdef _EiC

main(1,"fitellipse.c");

#endif