Video coding for low bit rate communications (H.263)

Video coding for low bit rate communications (H.263)

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The H.263 Recommendation specifies a coded representation that can be used for compressing the moving picture components of audio-visual services at low bit rates. Detailed specifications of the first generation of this codec under the test model (TM) to verify the performance and compliance of this codec were finalised in 1995. The basic configuration of the video source algorithm in this codec is based on ITU-T Recommendation H.261, which is a hybrid of interpicture prediction to utilise temporal redundancy and transform coding of the residual signal to reduce spatial redundancy. However, during the course of the development of H.261 and the subsequent advances on video coding in MPEG-1 and MPEG-2 video codecs, substantial experience was gained, which has been exploited to make H.263 an efficient encoder. In this chapter those parts of the H.263 standard that make this codec more efficient than its predecessors will be explained.

Inspec keywords: data compression; audio-visual systems; code standards; transform coding; video coding

Other keywords: MPEG-1 video codec; residual signal; spatial redundancy reduction; video coding; audio-visual services; transform coding; temporal redundancy; moving picture component compression; MPEG-2 video codec; video source algorithm; H.263 Recommendation; ITU-T Recommendation H.261; bit-rate communications; interpicture prediction

Subjects: Image and video coding

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