increase performance of OpenCV on Beaglebone Black

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Dear everyone, I install OpenCV 2.4.9 on Beaglebone Black (ubuntu 12.04), and compile with NEON to increase frame rate, after compiling, the frame rate still slow, about 2-3 fps, so I just want to find a way to get more than 15 fps. What is the best way I should do? Thank everyone!