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To complement @dandelion1124's answer, here is the relevant slide 19:

GPU acceleration: Transparent API

• same code can run on CPU or GPU – no specialized cv::Canny, ocl::Canny, etc; no recompilation is needed
• minimal or no changes in the existing code
  • CPU-only processing – no changes required
• includes the following key components:
  • new data structure UMat
  • simple and robust mechanism for async processing
  • open to extensions: convenient OpenCL wrappers for accelerating user algorithms