My is Windows 7 64 - bit, configuration is VS2010 + OPENCV2.4.9 program code is as follows:
# include & lt; Opencv2/opencv. Hpp>
Using the namespace CV;

Int main ()
{
//VideoCapture capture (" F: \ \ video \ \ 1. Avi ");//read video
VideoCapture capture (0);//read camera
While (1)
{
Mat frame;
Capture> Frame;

Imshow (" readvideo, "frame);

WaitKey (30);


}
return 0;
}

Run to imshow function will appear when the error


I am a novice, just to learn, to get to the Internet to find a lot of methods, including waitKey time instead of what, all useless, have a great god know what's the problem,

CodePudding user response:

I have just a piece of code, for your reference,

 
Void ThreadFunction (void * Param) 
{

_this FacePhoto *=Param (FacePhoto *); 
Frame IplImage * and * frame_copy=0; 

Cascade=(CvHaarClassifierCascade *) cvLoad (" haarcascade_frontalface_alt. XML ", 0, 0, 0). 
if( ! Cascade) 
return; 
Eye_cascade=(CvHaarClassifierCascade *) cvLoad (" haarcascade_eye. XML ", 0, 0). 
if(! Eye_cascade) 
return; 



Storage=cvCreateMemStorage (0); 
CvCapture * capture=cvCaptureFromCAM (0); 
Int rw=cvSetCaptureProperty (the capture, CV_CAP_PROP_FRAME_WIDTH, 1920); 
Int rh=cvSetCaptureProperty (the capture, CV_CAP_PROP_FRAME_HEIGHT, 1080); 

If (capture) 
{
_this - & gt; ThreadExit=false; 

while(! _this - & gt; ThreadTerminated ()) 

{
If (_this - & gt; IfTakePhotoPaused ()) 
continue; 
if( ! CvGrabFrame (capture)) 
break; 
Frame=cvRetrieveFrame (capture);//from cameras capture a frame image 
if( ! Frame) 
break; 
if( ! Frame_copy) 
Frame_copy=cvCreateImage (cvSize (frame - & gt; Width, frame - & gt; Height), 
IPL_DEPTH_8U, frame - & gt; NChannels); 
If (frame - & gt; Origin==IPL_ORIGIN_TL) 
CvCopy (frame, frame_copy, 0); 
The else 
CvFlip (frame, frame_copy, 0); 

//gWaitCount + +; 
_this - & gt; DetectAndDraw (frame_copy); 

CvReleaseImage (& amp; Frame_copy); 

} 

} 
CvReleaseCapture (& amp; The capture); 
_this - & gt; ThreadExit=true; 
CvReleaseMemStorage (& amp; Storage); 
CvReleaseHaarClassifierCascade (& amp; Cascade); 
CvReleaseHaarClassifierCascade (& amp; Eye_cascade); 

G_event. SetEvent (); 
}