OpenCV Canny Edge on Live Video-Collection of common programming errors

• The Problem is that you are passing a 3 channel image everywere

  IplImage* out = cvCreateImage( cvGetSize(frame), IPL_DEPTH_8U, 3 );
  

  Create other two images of single channel and use those:

  IplImage* gray_out = cvCreateImage( cvGetSize(frame), IPL_DEPTH_8U, 1 );
  IplImage* canny_out = cvCreateImage( cvGetSize(frame), IPL_DEPTH_8U, 1 );
  

  and use it in:

  cvSmooth( frame, out, CV_GAUSSIAN, 11, 11 );
  cvCvtColor(out , gray_out, CV_RGB2GRAY);
  cvCanny( gray_out, canny_out, 10, 10, 3 );
  
  if( !frame ) break;
  cvShowImage( "Edge", canny_out );
  

  This works for me:

  #include 
  #include 
  #include 
  #include 
  #include 
  #include 
  #include 
  #include 
  #include 
  
  
  using namespace std;
  using namespace cv;
  
  int main(int, char**)
  {
  
      cvNamedWindow("Edges", CV_WINDOW_AUTOSIZE); 
  CvCapture* capture = cvCaptureFromCAM(0);
  
  IplImage* frame;
      while(1) {
          frame = cvQueryFrame( capture );
  
          int depth_img =frame->depth;
          int height_img =frame->height;
          int width_img =frame->width;
          int size_img =frame->imageSize;
          int nchan_img =frame->nChannels;
          int nsize_img =frame->nSize;
  
          cout

Originally posted 2013-11-06 03:16:48.