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Accelerate undistort() with parralelism on GPU

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Dear all, I'm currently using opencv accelerated functions from cv::cuda. I also want to use the **undistort()** function, wich is already parralelised on CPU. However, the use of this function still takes too much time, and I want to compile it for GPU use. I'm trying to make my own version of this function, but I get stucked with **getInitUndistortRectifyMapComputer()** This function is calling itself in **undistort.dispatch.cpp** : namespace { Ptr getInitUndistortRectifyMapComputer(Size _size, Mat &_map1, Mat &_map2, int _m1type, const double *_ir, Matx33d &_matTilt, double _u0, double _v0, double _fx, double _fy, double _k1, double _k2, double _p1, double _p2, double _k3, double _k4, double _k5, double _k6, double _s1, double _s2, double _s3, double _s4) { CV_INSTRUMENT_REGION(); CV_CPU_DISPATCH(getInitUndistortRectifyMapComputer, (_size, _map1, _map2, _m1type, _ir, _matTilt, _u0, _v0, _fx, _fy, _k1, _k2, _p1, _p2, _k3, _k4, _k5, _k6, _s1, _s2, _s3, _s4), CV_CPU_DISPATCH_MODES_ALL); } } // namespace I cannot find where the function is implemented. Also, the study of **ParallelLoopBody**, **parallel_for_** and **CV_CPU_DISPATCH** led me nowhere **How can I find the source code to compile my own version of the function ??** **Is there an other way to get the same result using other** (opencv or not) **stuff ??** Thanks,

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