title: Intel TBB for OpenCV pow and sqrt
body: <p>In my c++ image processing algorithm, Mat.mul(), cv::pow and cv::sqrt are the most time consuming operations. Is it possible to speed up these operations using Intel TBB?
  Do I need to write my own matrix mul,pow and sqrt functions to enable TBB support (e.g. using parallel_for for iterating over mat) or is TBB support included for these functions in OpenCV?
  Are there any diffrent approaches for paralization of these functions?</p>