随机线厚度-OpenCv

我正在使用C API开发一个OpenCV应用程序。我试图让我的

cvLine

函数具有随机厚度，因此它第一次绘制时的厚度为3，第二次可能为10。现在，它每次绘制的厚度都是一样的。我曾尝试实现

cvRandInt

，但即使通过研究，我也无法理解如何使用此函数

CvRNG rng;

int thickness=cvRandInt(&rng);


IplImage* imgScribble = NULL;

while(true )
    {  

         IplImage *frame=0; 
         frame=cvQueryFrame(capture);
          if( !frame ) break;


         if(imgScribble == NULL)
             {   


     imgScribble = cvCreateImage(cvGetSize(frame), 8, 3);

             }



// Holds the yellow thresholded image 

  IplImage* imgYellowThresh1 = GetThresholdedImage1(frame,1);
  double moment10 = cvGetSpatialMoment(moments_yellow, 1, 0);
  double moment01 = cvGetSpatialMoment(moments_yellow, 0, 1);
  double area = cvGetCentralMoment(moments_yellow, 0, 0);
  int lastX = posX;
  int lastY = posY;
  posX = moment10/area;
  posY = moment01/area;

                if(lastX>0 && lastY>0 && posX>0 && posY>0)

                  {  

             cvLine(imgScribble, cvPoint(posX, posY), cvPoint(lastX, lastY), cvScalar(10,255,255), thickness,CV_AA, 0);                 

                   }

---

我认为这应该奏效：

//----------------------------------------------------------------------------------------------
// MAIN
//----------------------------------------------------------------------------------------------
int main( int argc, char** argv )
{
    int MaxThickness=10;
    CvRNG rng = cvRNG(0xffffffff);
    //  CvRNG rng(time(NULL));
    cvNamedWindow("img");
    IplImage* img=cvCreateImage( cvSize(800,600), 8, 3 );

    int MaxThikness=10;

    int k=0;
    while(k!=27)
    {
        int thickness=cvRandInt(&rng)%MaxThikness;
        //cout << thickness << endl;
        cvSet(img,cvScalar(255,0,0));
        cvLine(img,cvPoint(50,50),cvPoint(0,0),cvScalar(100,255,255),thickness);        
        cvShowImage("img",img);
        k=cvWaitKey(500);
    }  
    return 0;
}

---

这条线似乎只画了最大数量的厚度。我已经更新了上面的代码，我已经测试过了，效果很好。谢谢Andrey。随机代码可以工作，但是我使用的颜色跟踪代码在这个循环中变得混乱，不再跟踪颜色。有什么想法吗？你能展示一下你试图结合这段代码的代码框架吗？我已经在我的答案中添加了代码。我不能测试这个片段，因为这个片段中定义/使用了一些变量，但我认为它应该可以工作。它将在每个周期改变厚度。

CvRNG rng = cvRNG(0xffffffff);
int MaxThikness=10;
int thickness=0;
IplImage* imgScribble = NULL;
IplImage *frame = NULL;
IplImage* imgYellowThresh1=NULL; 
while(true )
    {        
         frame=cvQueryFrame(capture);
          if( !frame ) break;
         if(imgScribble == NULL)
             {   
     imgScribble = cvCreateImage(cvGetSize(frame), 8, 3);
             }

// Holds the yellow thresholded image 

  imgYellowThresh1 = GetThresholdedImage1(frame,1);
  double moment10 = cvGetSpatialMoment(moments_yellow, 1, 0);
  double moment01 = cvGetSpatialMoment(moments_yellow, 0, 1);
  double area = cvGetCentralMoment(moments_yellow, 0, 0);
  int lastX = posX;
  int lastY = posY;
  posX = moment10/area;
  posY = moment01/area;

  thickness=cvRandInt(&rng)%MaxThikness;
  if(lastX>0 && lastY>0 && posX>0 && posY>0)
                  {  
             cvLine(imgScribble, cvPoint(posX, posY), cvPoint(lastX, lastY), cvScalar(10,255,255), thickness,CV_AA, 0);                 
                   }