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@0xfaded Thanks for your explanation and it's helpful. I have implemented your codes on my iPhone device and compared the fast algorithm to the OpenCV ones. But the result showed...

Thanks for your help. I compiled my project with release. It is surprising that the speed of your NEON code is faster than openCV version.

1. I highly recommend that non templated functions should be employed since in some cases image size cannot be known before compiling. Non templated functions could receive some parameters dynamically...

Hi @0xfaded . I have some new problems: 1. How do you check whether the consecutive 9 pixels around center meets the fast threshold requirement? 2. In your `fastDetect`, you...

1. Could I think that these piece of your codes only count the number of zeros from most significant bit? 2. I am trying to utilize NEON make orb extractor...

Yeah.

@dreamer1031 it is only for backend.