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pyrUp() and pyrDown() only work with a factor of 2, you can't do arbitrary up / downscaling like that
(use cv::resize() then !)
you're supposed to use it recursively, like:
Mat a = ...
Mat b; pyrUp(a,b); // * 2
Mat c; pyrUp(b,c); // * 4
Mat d; pyrUp(c,d); // * 8
(there is a Size param in those functions, but you're only allowed to variate it +- 1 pixel, to compensate for odd image sizes when downscaling)