This article presents a detailed description and implementation of the Scale Invariant Feature Transform (SIFT), a popular image matching algorithm. This work contributes to a detailed dissection of SIFT's complex chain of transformations and to a careful presentation of each of its design parameters. A companion online demonstration allows the reader to use SIFT and individually set each parameter to analyze its impact on the algorithm results. Source Code The source code (ANSI C), its documentation, and the online demo are accessible at the IPOL web page of this article 1 .

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