EURASIP Journal on Applied Signal Processing
Volume 2006 (2006), Article ID 83563, 15 pages
doi:10.1155/ASP/2006/83563
Abstract
A new video coding standard H.264/AVC has been recently developed
and standardized. The standard represents a number of advances in
video coding technology in terms of both coding efficiency and
flexibility and is expected to replace the existing standards
such as H.263 and MPEG-1/2/4 in many possible applications. In
this paper we investigate and present efficient syntax transcoding
and downsizing transcoding methods from H.263 to H.264/AVC
standard. Specifically, we propose an efficient motion vector
reestimation scheme using vector median filtering and a fast
intraprediction mode selection scheme based on coarse edge
information obtained from integer-transform coefficients.
Furthermore, an enhanced rate control method based on a quadratic
model is proposed for selecting quantization parameters at the
sequence and frame levels together with a new frame-layer bit
allocation scheme based on the side information in the precoded
video. Extensive experiments have been conducted and the results
show the efficiency and effectiveness of the proposed methods.