An analysis of the DCT coefficient distribution with the H.264 video coder

Author

Altunbasak, Yucel ; Kamaci, Nejat

Author_Institution

Center for Signal & Image Process., Georgia Inst. of Technol., Atlanta, GA, USA

Volume

3

fYear

2004

fDate

17-21 May 2004

Abstract

By extensive analysis with several video sequences, we observed that the statistical distribution of the DCT coefficients in typical video coding applications is closer to a Cauchy distribution than to a Laplacian distribution. We developed the rate and the distortion expressions as a function of the video coder quantization parameter based on this observation. Experiments with an H.264 codec demonstrate that the Cauchy distribution based expressions provide better estimates for the actual rate and distortion than those that are based on the Laplacian distribution.

Keywords

discrete cosine transforms; image sequences; parameter estimation; quantisation (signal); statistical distributions; transform coding; video codecs; video coding; Cauchy distribution; DCT coefficient distribution; H.264 codec; H.264 video coder; Laplacian distribution; distortion estimation; quantization parameter; rate estimation; statistical distribution; video coding; video sequences; Bit rate; Discrete cosine transforms; Image coding; Laplace equations; Probability distribution; Quantization; Rate distortion theory; Statistical distributions; Video coding; Video compression;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 2004. Proceedings. (ICASSP '04). IEEE International Conference on

ISSN

1520-6149

Print_ISBN

0-7803-8484-9

Type

conf

DOI

10.1109/ICASSP.2004.1326510

Filename

1326510