Encyclopedia of Multimedia

2008 Edition
| Editors: Borko Furht

H.263 Video Compression

Reference work entry
DOI: https://doi.org/10.1007/978-0-387-78414-4_329


H.263 is a teleconferencing video compression standard developed by the ITU, which was designed for low bit rate conversational video services.

H.263 technology became a basis for later MPEG-4 Part 2 since MPEG-4 community intended to develop a technology optimized for very low bit rate applications at the first stage. As a result, wireless phone standards such as 3GPP include H.263 as a video subsystem compression standard. In addition, MPEG-4 Part 2 requires any compliant decoders to be able to decode H.263B (Base).

Key Compression Tools for H.263 Video

The basic configuration of the video compression algorithm in H.263 is based on H.261 developed by ITU. H.263 is a hybrid coder that is based on 8 × 8 block DCT and 16 × 16/8 × 8 motion compensation with half-pel resolution. In H.263, the source video formats are fixed as the following five – SubQCIF/QCIF/CIF/4CIF/16CIF. There are three frame types – I, P and PB. MBs in I are all Intra-coded, while MBs in P are either...

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  1. 1.
    J.L. Mitchell, W.B. Pennebaker, C.E. Fogg, and D.J. LeGall, “MPEG Video Compression Standard,” Digital Multimedia Standards Series, Chapman and Hall, New York, 1996, pp. 135–169.Google Scholar

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© Springer-Verlag 2008