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Meaning of "position of mapped points" in cv::cuda::meanShiftProc()

I am presently using and very satisfied with the implementation of the mean shift segmentation algorithm in the CUDA module. However, I cannot understand the meaning of the data contained in the dstsp output parameter in the cv::cuda::meanShiftProc() function. I can't find the necessary details in the documentation, and I can't guess the meaning of the "position of mapped points" from the literature, nor from the size and type of dstsp.

Can anyone offer me a hint? Does "position" mean some position in the color space, or in the image coordinates, or in the color histogram, or something completely different?