Studying the GOP Size Impact on the Performance of a Feedback Channelbased WynerZiv Video.pdfVIP

Studying the GOP Size Impact on the Performance of a Feedback Channel-based Wyner-Ziv Video Codec 1 2 1 Fernando Pereira , João Ascenso , Catarina Brites 1 Instituto Superior Técnico – Instituto de Telecomunicações, Av. Rovisco Pais, 1049-001 Lisboa, Portugal 2 Instituto Superior de Engenharia de Lisboa ― Instituto de Telecomunicações, Rua Conselheiro Emídio Navarro, 1, 1950-062 Lisboa, Portugal {fernando.pereira, joao.ascenso, catarina.brites}@lx.it.pt Abstract. Wyner-Ziv video coding has become one of the hottest research topics in the video coding community due to the conceptual, theoretical and functional novelties it brings. Among the many practical architectures already available, feedback channel-based with channel coding, e.g. LDPC and turbo codes, solutions are rather popular. These solutions rely on decoder motion estimation based on periodic Intra coded key frames, setting the so-called GOP size, very much like in conventional video coding. This paper targets the rate- distortion and complexity performance study of this type of Wyner-Ziv coding solution as a function of the GOP size, considering both LPDC and turbo codes. Keywords: Distributed video coding, Wyner-Ziv video coding, GOP size, LDPC coding, Turbo coding, RD performance, Complexity performance. 1 Introduction Since the middle eighties, the video coding research community has been developing video codecs where it is the task of the encoder to exploit the data redundancy and irrele