canny.c

opencv图像处理讲义

/**************************************************
 * cvCanny：Canny边缘检测
 **************************************************/

/***********************************************************************
 * OpenCV example
 * Copyright (C) 2006  Shiqi Yu
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 ***********************************************************************/


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

int main( int argc, char** argv )
{
  //声明IplImage指针
  IplImage* pImg = NULL; 
  IplImage* pCannyImg = NULL;

  //载入图像，强制转化为Gray
  if( argc == 2 && 
      (pImg = cvLoadImage( argv[1], 0)) != 0 )
    {

      //为canny边缘图像申请空间
      pCannyImg = cvCreateImage(cvGetSize(pImg),
					  IPL_DEPTH_8U,
					  1);
      //canny边缘检测
      cvCanny(pImg, pCannyImg, 50, 150, 3);

      //创建窗口
      cvNamedWindow("src", 1);
      cvNamedWindow("canny",1);

      
      //显示图像
      cvShowImage( "src", pImg );
      cvShowImage( "canny", pCannyImg );
	
      cvWaitKey(0); //等待按键

      //销毁窗口
      cvDestroyWindow( "src" );
      cvDestroyWindow( "canny" );
      //释放图像
      cvReleaseImage( &pImg ); 
      cvReleaseImage( &pCannyImg ); 

      return 0;
    }

  return -1;
}