ezSIFT
An easy-to-use standalone SIFT library written in C/C++
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Updated 06/28/2018
The ezSift project has moved to https://github.com/robertwgh/ezSIFT
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The SIFT (scale-invariant feature transform) algorithm is considered to be one of the most robust local feature detector and description methods. Most of the open-source SIFT implementations rely on some 3rd-party libraries. Some of them even rely on a few different large libraries. These dependencies make the installation, compilation and usage not easy.
The ezSIFT library provides a standalone and lightweight SIFT implementation written in C/C++. The ezSIFT is self-contained, and does not require any other libraries. So it is easy to use and modify. Besides, the implementation of the ezSIFT is straightforward and easy to read.
Wiki page:
https://sourceforge.net/p/ezsift/wiki/