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2 Image Processing & Communications

2 1998

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Modified H.263 codec with improved color reproduction

Bartkowiak M., Domański M., Gerken P.

Image Processing & Communications

1998

Vol. 4, no 1-2

17--24

A modification of the H.263 intraframe mode is proposed. The modification is restricted to chrominance processing only. The two input chrominance components are converted into one scalar chrominance signal which is then processed by an H.263 coder with modified quantization of DCT coefficients. The original chrominance components are recovered using postprocessing after the H.263 decoding.

Application of multiresolution vector quantisation to scaleable low bitrate and video coding

Bober M., Ciepliński L.

Image Processing & Communications

1998

Vol. 4, no 1-2

25-35

A hybrid video codec employing multiresolution vector quantisation of intra-mode frames and DCT-based encoding of inter-mode framers is presented. The performance of the proposed technique is compared to the MPEG-4 video Verification Model version 4.0 and the TMN-2.0 implementation of the H.263 standard. The result show a significant performance improvement both in terms of signal to noise ratio and subjective visual quality.