Canny边缘检测2

Wikipedia，自由的百科全书

13:43 2007年6月25日的修订版本 Shiqi Yu (Talk | 贡献) ← Previous diff		09:52 2008年2月29日的修订版本 Eralvc (Talk | 贡献) Next diff →
第 15行：		第 15行：
	char wndname[] = "Edge";		char wndname[] = "Edge";
	char tbarname[] = "Threshold";		char tbarname[] = "Threshold";
-	int edge_thresh = 1;	+
	IplImage *image = 0, *cedge = 0, *gray = 0, *edge = 0;		IplImage *image = 0, *cedge = 0, *gray = 0, *edge = 0;
第 26行：		第 26行：
	// Run the edge detector on grayscale		// Run the edge detector on grayscale
-	cvCanny(gray, edge, (float)edge_thresh, (float)edge_thresh*3, 3);	+	cvCanny(gray, edge, (float)h, (float)h*3, 3);
	cvZero( cedge );		cvZero( cedge );
第 38行：		第 38行：
	{		{
	char* filename = argc == 2 ? argv[1] : (char*)"fruits.jpg";		char* filename = argc == 2 ? argv[1] : (char*)"fruits.jpg";
-		+	int edge_thresh = 1;
	if( (image = cvLoadImage( filename, 1)) == 0 )		if( (image = cvLoadImage( filename, 1)) == 0 )
	return -1;		return -1;

---

09:52 2008年2月29日的修订版本

运行结果：

代码： <c>#ifdef _CH_

1. pragma package <opencv>
2. endif

1. ifndef _EiC
2. include "cv.h"
3. include "highgui.h"
4. endif

char wndname[] = "Edge"; char tbarname[] = "Threshold";

IplImage *image = 0, *cedge = 0, *gray = 0, *edge = 0;

// define a trackbar callback void on_trackbar(int h) {

   cvSmooth( gray, edge, CV_BLUR, 3, 3, 0, 0 );
   cvNot( gray, edge );

   // Run the edge detector on grayscale
   cvCanny(gray, edge, (float)h, (float)h*3, 3);
 
   cvZero( cedge );
   // copy edge points
   cvCopy( image, cedge, edge );

   cvShowImage(wndname, cedge);

}

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

   char* filename = argc == 2 ? argv[1] : (char*)"fruits.jpg";
   int edge_thresh = 1;   
   if( (image = cvLoadImage( filename, 1)) == 0 )
       return -1;

   // Create the output image
   cedge = cvCreateImage(cvSize(image->width,image->height), IPL_DEPTH_8U, 3);

   // Convert to grayscale
   gray = cvCreateImage(cvSize(image->width,image->height), IPL_DEPTH_8U, 1);
   edge = cvCreateImage(cvSize(image->width,image->height), IPL_DEPTH_8U, 1);
   cvCvtColor(image, gray, CV_BGR2GRAY);

   // Create a window
   cvNamedWindow(wndname, 1);

   // create a toolbar 
   cvCreateTrackbar(tbarname, wndname, &edge_thresh, 100, on_trackbar);

   // Show the image
   on_trackbar(0);

   // Wait for a key stroke; the same function arranges events processing
   cvWaitKey(0);
   cvReleaseImage(&image);
   cvReleaseImage(&gray);
   cvReleaseImage(&edge);
   cvDestroyWindow(wndname);

   return 0;

}

1. ifdef _EiC

main(1,"edge.c");

1. endif

</c>