Corda, FabrizioSorrentino, FabioScateni, RiccardoAndrea Giachetti2014-12-162014-12-162014978-3-905674-72-9https://doi.org/10.2312/stag.20141240Chroma Key is a special-effects technique widely used by television and motion picture industries for image composition. This technique allows users to replace sections identified by a chosen colour in a multimedia stream (like a video or a photo) with another image or video stream. In this paper, we describe an easy-to-implement technique for the creation of an Android based application for mobile devices (like smartphones and tablets) that applies Chroma Key-based effects to the video stream coming from the device camera. We discuss the algorithm used to achieve the Chroma Key effect focusing on the computational performance and on the quality of its final result. Using a picture selected from the device gallery, this application makes possible the replacement of video stream background areas characterized by a chroma value with the chosen picture.I.4.8 [Image Processing and Computer Vision]Scene AnalysisObject recognition