Chroma coding for video at very low bit rates

Lina Karam, Chris Podilchuk

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Color pictures are usually compressed in a luminance-chrominance coordinate space. We consider the problem of encoding the chrominance information for very low bit rate video coding systems aimed at bit rates in the range 8 to 40 kbps. The challenge here is that the chrominance components typically get less than 10 to 20% of the total very low bit rate allocated for the video data. We found that it is sufficient to encode the chrominance information at 1/8 of the luminance resolution in both the horizontal and vertical directions. While, for many of the previous coding methods, the compression is performed independently for the luminance and chrominance coordinates, we propose a coding scheme which exploits the coded luminance data in coding and retrieving the chrominance components. The proposed video coder is an improved extension of an existing luminance-only coder so that color motion video can be coded at very low bit rates under fixed frame and bit rate constraints. It is based on a hybrid waveform coding technique with an implicit model-based component. Very good results were obtained for head-and-shoulders sequences even with chroma rates of less than 7% of the total very low bit rate. In addition, subjective tests indicate that the coded chrominance information improves the visual perception of noisy image features.

Original languageEnglish (US)
Title of host publicationIEEE International Conference on Image Processing
Editors Anon
Place of PublicationLos Alamitos, CA, United States
PublisherIEEE
Pages562-565
Number of pages4
Volume1
StatePublished - 1996
Externally publishedYes
EventProceedings of the 1995 IEEE International Conference on Image Processing. Part 3 (of 3) - Washington, DC, USA
Duration: Oct 23 1995Oct 26 1995

Other

OtherProceedings of the 1995 IEEE International Conference on Image Processing. Part 3 (of 3)
CityWashington, DC, USA
Period10/23/9510/26/95

Fingerprint

Luminance
Color
Image coding

ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition
  • Hardware and Architecture
  • Electrical and Electronic Engineering

Cite this

Karam, L., & Podilchuk, C. (1996). Chroma coding for video at very low bit rates. In Anon (Ed.), IEEE International Conference on Image Processing (Vol. 1, pp. 562-565). Los Alamitos, CA, United States: IEEE.

Chroma coding for video at very low bit rates. / Karam, Lina; Podilchuk, Chris.

IEEE International Conference on Image Processing. ed. / Anon. Vol. 1 Los Alamitos, CA, United States : IEEE, 1996. p. 562-565.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Karam, L & Podilchuk, C 1996, Chroma coding for video at very low bit rates. in Anon (ed.), IEEE International Conference on Image Processing. vol. 1, IEEE, Los Alamitos, CA, United States, pp. 562-565, Proceedings of the 1995 IEEE International Conference on Image Processing. Part 3 (of 3), Washington, DC, USA, 10/23/95.
Karam L, Podilchuk C. Chroma coding for video at very low bit rates. In Anon, editor, IEEE International Conference on Image Processing. Vol. 1. Los Alamitos, CA, United States: IEEE. 1996. p. 562-565
Karam, Lina ; Podilchuk, Chris. / Chroma coding for video at very low bit rates. IEEE International Conference on Image Processing. editor / Anon. Vol. 1 Los Alamitos, CA, United States : IEEE, 1996. pp. 562-565
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