showFlow          199 samples/gpu/optical_flow.cpp         showFlow("Brox", d_flow);
showFlow          210 samples/gpu/optical_flow.cpp         showFlow("LK", d_flow);
showFlow          221 samples/gpu/optical_flow.cpp         showFlow("Farn", d_flow);
showFlow          232 samples/gpu/optical_flow.cpp         showFlow("TVL1", d_flow);