A multiresolution two-layer video codec for networking applications

Author

Ng, K.T. ; Chan, S.C. ; Ng, T.S.

Author_Institution

Dept. of Electr. & Electron. Eng., Hong Kong Univ., Hong Kong

Volume

2

fYear

1996

fDate

14-18 Oct 1996

Firstpage

1071

Abstract

We propose an improved multiresolution two-layer video codec that can operate at a base layer of 64 kbps and a variable bit rate second layer (VBR). The basic idea is to use a multiresolution technique to reduce the original CIF format video to the QCIF format. The low-resolution video is then encoded with an improved H.261 codec. To reduce the bit rate of the second layer, the residuals are encoded with the discrete cosine transform (DCT) using perceptually weighted quantization step sizes. Simulation results show that the Miss America sequence can be transmitted at 64 kbps in the CIF format with a reasonably good picture quality. For a good picture quality, the second layer would typically require 190 kbps

Keywords

code standards; discrete cosine transforms; image resolution; image sequences; telecommunication networks; telecommunication standards; transform coding; video codecs; video coding; 190 kbit/s; 64 kbit/s; ATM networks; B-ISDN; CIF format video; DCT; H.261 codec; Miss America sequence; QCIF format; base layer; bit rate reduction; discrete cosine transform; low resolution video; multiresolution two layer video codec; networking applications; perceptually weighted quantization step sizes; picture quality; residuals coding; simulation results; variable bit rate; Asynchronous transfer mode; B-ISDN; Bit rate; Discrete cosine transforms; Frequency; ISDN; Image quality; Quantization; Signal resolution; Video codecs;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing, 1996., 3rd International Conference on

Conference_Location

Beijing

Print_ISBN

0-7803-2912-0

Type

conf

DOI

10.1109/ICSIGP.1996.566278

Filename

566278