Contours2.cpp

//
//  Contours2.cpp
//  LearningOpenCV
//
//  Created by YourtionGuo on 7/28/16.
//  Copyright © 2016 Yourtion. All rights reserved.
//

#include <iostream>
#include <highgui.h>
#include <cv.h>

#define CVX_RED CV_RGB( 0xff, 0x00, 0x00 )
#define CVX_BLUE CV_RGB( 0x00, 0x00, 0xff )

int main(int argc, const char * argv[]) {
    
    cvNamedWindow( "Contours2" );
    
    IplImage* img_8uc1 = cvLoadImage( argv[1], CV_LOAD_IMAGE_GRAYSCALE );
    IplImage* img_edge = cvCreateImage( cvGetSize(img_8uc1), 8, 1 );
    IplImage* img_8uc3 = cvCreateImage( cvGetSize(img_8uc1), 8, 3 );
    cvThreshold( img_8uc1, img_edge, 128, 255, CV_THRESH_BINARY );
    
    CvMemStorage* storage = cvCreateMemStorage();
    CvSeq* first_contour = NULL;
    int Nc = cvFindContours( img_edge, storage, &first_contour, sizeof(CvContour), CV_RETR_LIST );
    int n = 0;
    printf( "Total Contours Detected : %d\n", Nc );
    
    for ( CvSeq* c = first_contour; c != NULL; c = c->h_next ) {
        cvCvtColor( img_8uc1, img_8uc3, CV_GRAY2BGR );
        cvDrawContours( img_8uc3, c, CVX_RED, CVX_BLUE, 0, 2, 8 );
        printf( "Contour #%d\n", n );
        cvShowImage( "Contours2", img_8uc3);
        printf( " %d elements:\n", c->total );
        for( int i = 0; i < c -> total; ++i )
        {
            CvPoint* p = CV_GET_SEQ_ELEM( CvPoint, c, i );
            printf( "    (%d,%d)\n", p -> x, p -> y );
        }
        cvWaitKey(0);
        n++;
    }
    
    printf( "Finished all contours.\n" );
    cvCvtColor( img_8uc1, img_8uc3, CV_GRAY2BGR );
    cvShowImage( "Contours2", img_8uc3 );
    cvWaitKey(0);
    cvDestroyWindow( "Contours2" );
    cvReleaseImage( &img_8uc1 );
    cvReleaseImage( &img_8uc3 );
    cvReleaseImage( &img_edge );
    
    return 0;
}