// ************************* 程序 18-6 ****************************
/*** 程序功能：
    canny邊緣檢測

// ***************************************************************/


//
/*

#include "cv.h"
#include "cxcore.h"
#include "highgui.h"

int main ( int argc, char **argv )
{
    //聲明IplImage指針
    IplImage *pImg = NULL; 
    IplImage *pContourImg = NULL;

    CvMemStorage *storage = cvCreateMemStorage ( 0 );
    CvSeq *contour = 0;
    int mode = CV_RETR_EXTERNAL;

    //創(chuàng)建窗口
    cvNamedWindow ( "src", 1 );
    cvNamedWindow ( "contour", 1 );

    //載入圖像，強(qiáng)制轉(zhuǎn)化為Gray
    if ( ( pImg = cvLoadImage ( "4.png", 0 ) ) != 0 )
    {
        cvShowImage ( "src", pImg );

        //為輪廓顯示圖像申請空間
        //3通道圖像，以便用彩色顯示
        pContourImg = cvCreateImage ( cvGetSize ( pImg ), IPL_DEPTH_8U, 3 );
        //將圖像轉(zhuǎn)換為BGR模式
        cvCvtColor ( pImg, pContourImg, CV_GRAY2BGR );

        //查找contour 提取黑色背景下的物品輪廓
        cvFindContours ( pImg,
                         storage,
                         &contour,
                         sizeof ( CvContour ),
                         mode,
                         CV_CHAIN_APPROX_SIMPLE );
    }
    else
    {
        //銷毀窗口
        cvDestroyWindow ( "src" );
        cvDestroyWindow ( "contour" );
        cvReleaseMemStorage ( &storage );

        return -1;
    }




    //將輪廓畫出    
    cvDrawContours ( pContourImg, contour, CV_RGB ( 0, 255, 0 ), CV_RGB ( 0, 0, 0 ), 1, 1, 8 );
    //顯示圖像
    cvShowImage ( "contour", pContourImg );

    cvWaitKey ( 0 );

    //銷毀窗口
    cvDestroyWindow ( "src" );
    cvDestroyWindow ( "contour" );
    //釋放圖像
    cvReleaseImage ( &pImg ); 
    cvReleaseImage ( &pContourImg ); 

    cvReleaseMemStorage ( &storage );

    return 0;
}



  //*/