thresh_to_zero_inv_func  616 modules/core/include/opencv2/core/cuda/functional.hpp     template <typename T> struct thresh_to_zero_inv_func : unary_function<T, T>
thresh_to_zero_inv_func  761 modules/cudev/include/opencv2/cudev/functional/functional.hpp __host__ __device__ ThreshToZeroInvFunc<T> thresh_to_zero_inv_func(T thresh)