A faster re-implementation of the FAST-9 algorithm (C++, with C bindings available)
C++
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f9.cpp
f9.h

README.md

F9 Corner Detection Library

F9 Corner Detection Library is an open source implementation of the FAST-9 corner detection algorithm, which avoids many re-allocations and tries to generally perform better.

Note: This code is pretty old, and only kept for reference. A more modern approach would probably involve using the GPU instead of doing everything on the CPU.

The library consists of a single source file (f9.cpp) and a public header file (f9.h), and can be packaged as a static or shared library as well as built directly into your projects.

Update Feb, 1st 2017: @jwijffels created an R package around this code, which you can find at https://github.com/bnosac/image.CornerDetectionF9

API

See f9.h.

Multithread support: The F9 context (C API) and the F9 class (C++ API) are not thread-safe, but it's easy to create one of these for each thread where you need to perform corner detection (the library is reentrant). You could for instance split a big image in four tiles and detect its corners in four threads, using four F9 contexts/instances in total.

License

This code is released under the terms of the Simplified BSD License below.

Copyright 2011 Julien Cayzac. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

   1. Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.

   2. Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.

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