OpenCv: How to set a marker at a certain coordinate in a video stream open cv
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26-02-2021 - |
Pergunta
I'm working with NITE/OPENNI and opencv in xcode 4 to work with the kinect. I'm able to get the coordinates of the head for example this is done by :
In the main, outside the wile(true):
IplImage *rgbimg = cvCreateImageHeader(cvSize(640,480), 8, 3);
Then in the wile(true)
XnSkeletonJointPosition Head;
g_UserGenerator.GetSkeletonCap().GetSkeletonJointPosition( aUsers[i], XN_SKEL_HEAD, Head);
printf("%d: (%f,%f,%f) [%f]\n", aUsers[i], Head.position.X, Head.position.Y, Head.position.Z, Head.fConfidence); }
I also have a video stream :
// Take current image
const XnRGB24Pixel* pImage = Xn_image.GetRGB24ImageMap();
//process image data
XnRGB24Pixel* ucpImage = const_cast<XnRGB24Pixel*> (pImage);
cvSetData(rgbimg,ucpImage, 640*3);
cvCvtColor(rgbimg,rgbimg,CV_RGB2BGR);
cvShowImage("RGB",rgbimg);
This is all done in the main in a while(true).
Now my question is how can i set some kind of marker (e.g.: *,cross-hair, X ) at the position of the coordinates of the hand in the video stream ?
EDIT
i tried:
XnRGB24Pixel* ucpImage = const_cast<XnRGB24Pixel*> (pImage);
cvSetData(rgbimg,ucpImage, 640*3);
cvCvtColor(rgbimg,rgbimg,CV_RGB2BGR);
cvCircle(rgbimg, cvPoint(Head.position.X,Head.position.Y), 20, cvScalar(0,255,0), 1);
cvShowImage("RGB",rgbimg);
and i get :
as you can see the circle stays in the top left corner for some reason. Any ideas how to change this ?
Solução
Try the display functions in OpenCV:
line(), circle(), drawPoly() and apply them to every frame in your video
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