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-DOMAIN RATE-DISTORTION OPTIMAL RATE CONTROL FOR DCT-BASED VIDEO Nejat Kamaci and Yucel Altunbasak
 

Summary: -DOMAIN RATE-DISTORTION OPTIMAL RATE CONTROL FOR DCT-BASED VIDEO
CODERS
Nejat Kamaci and Yucel Altunbasak
Center for Signal and Image Processing
Georgia Institute of Technology
Atlanta, GA 30332
email:{kamaci,yucel}@ece.gatech.edu
ABSTRACT
Most real-time MPEG-like encoders are designed to perform in a
constant bit rate (CBR) mode, in which large deviations from a
target rate are avoided at any time instant because of video buffer
regulations set at the decoder. A rate-control method at the en-
coder ensures that by intelligent selection of encoding parameters,
the video buffer constraints are met, while at the same time a best
possible video quality is achieved. Almost all reported rate-control
methods model the rate and distortion in terms of the quantiza-
tion step size. A recently suggested alternative is to use , the
fraction of zeros among the quantized DCT coefficients [5]. In
this paper, we address the problems associated with the -domain
rate-control approaches in the literature. In addition, we propose a

  

Source: Altunbasak, Yucel - School of Electrical and Computer Engineering, Georgia Institute of Technology

 

Collections: Engineering