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嗨，我还是 openCV 的新手……我正在尝试读取 avi 视频，然后在一定数量的帧之后显示帧，以允许用户在感兴趣区域 (ROI) 周围绘制一个框，以便用户给出视频的名称和用于跳过此帧数后的帧数显示下一帧并让用户绘制一个框并保存像素角坐标

问题是......我不知道我的代码中的问题在哪里......我不能画一个盒子（我看不到盒子）

任何帮助将不胜感激

这是我的代码......我正在使用 openCV 2.4.0

CvRect 框；布尔绘图框=假；

void draw_box(IplImage* img, CvRect rect) { cvRectangle(img, cvPoint(box.x, box.y), cvPoint(box.x+box.width,box.y+box.height), cvScalar(255, 255,255 ),1); }

void my_mouse_callback(int event, int x, int y, int flags, void* param) { IplImage* image = (IplImage*) param;

switch( event )
{
    case CV_EVENT_MOUSEMOVE: 
        if( drawing_box )
        {
            box.width = x-box.x;
            box.height = y-box.y;
        }
        break;

    case CV_EVENT_LBUTTONDOWN:
        drawing_box = true;
        box = cvRect( x, y, 0, 0 );
        break;

    case CV_EVENT_LBUTTONUP:
        drawing_box = false;
        if( box.width < 0 )
        {
            box.x += box.width;
            box.width *= -1;
        }
        if( box.height < 0 )
        {
            box.y += box.height;
            box.height *= -1;
        }
        draw_box( image, box );
        break;
}

}

int main (int argc, char * const argv[]) {

int n; 
char name [50]; 
box = cvRect(-1,-1,0,0);

if (argc==1)
{
    printf("\nEnter the name of the video:");
    scanf("%s",name); 
    printf("\nEnter number of frames:");
    scanf("%d",&n);

} else if (argc == 3)
{
    strcpy(name, argv[1]);
    n = atoi (argv[2]);
}
else 
{
    printf("To run this program you should enter the name of the program at least, or you can enter the name of the program then the file name then the number of frames ");
    return 0; 
}


// GET video
CvCapture* capture = cvCreateFileCapture( name );
if (!capture ) 
{
    printf( "Unable to read input video." );
    return 0;
}


int nframes = cvGetCaptureProperty( capture,CV_CAP_PROP_FRAME_COUNT);

//mouse data 
int ** points= new int*[nframes]; //x1, y1 , x2 , y2  
for (int i=0 ; i< nframes; i++)
    points[i]=new int [4]; 

// Read frame
IplImage* frame = cvQueryFrame( capture );

int c = 1; 
int sum = 1; 
char k ; 
cvNamedWindow("Draw box around the ROI ", CV_WINDOW_AUTOSIZE);

while(c <= nframes) 
{

    if(c == sum)
    {
        cvSetMouseCallback( "Draw box around the ROI ", my_mouse_callback, (void*) frame);


        cvShowImage("Draw box around the ROI ", frame);
        if( drawing_box ) 
        {
            draw_box( frame, box );
            cvShowImage("Draw box around the ROI ", frame);
            cvWaitKey( 15 ); 
        }

        points[c-1][0]= box.x  ;//x1
        points[c-1][1]= box.y ;//y1
        points[c-1][2]= box.x+box.width ;//x2
        points[c-1][3]= box.y+box.height ;//y2

        sum += n; 
    }

    frame = cvQueryFrame( capture );
    c++; 


    k = cvWaitKey(33);
    if( k == 27 ) 
        break;

}

// CLEAN everything
cvReleaseImage( &frame );
cvReleaseCapture( &capture );
cvDestroyWindow( "Draw box around the ROI" );

return 0;

}

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