diffSign          288 modules/superres/src/btv_l1.cpp     inline float diffSign(float a, float b)
diffSign          293 modules/superres/src/btv_l1.cpp     Point3f diffSign(Point3f a, Point3f b)
diffSign          325 modules/superres/src/btv_l1.cpp     void diffSign(InputArray _src1, OutputArray _src2, OutputArray _dst)
diffSign          165 modules/superres/src/btv_l1_cuda.cpp     void diffSign(const GpuMat& src1, const GpuMat& src2, GpuMat& dst, Stream& stream)