Options
1999
Conference Paper
Title
An efficient very low bit rate video coding scheme using warping prediction and wavelet-based residual coding
Abstract
This paper describes a video coding algorithm that combines new ideas in motion estimation and wavelet-based coding techniques. A motion estimation technique using an image warping model is employed to reduce temporal redundancies in a given image sequence. The underlying continuous motion model is based on a bilinear warp of a grid of quadrangles. It has the advantage of dealing with more complex motion than simple block matching schemes. In addition, a block adaptive high-quality texture interpolation is used to further improve the quality of the prediction. The prediction error image is decorrelated using a wavelet transform coupled with a framework of highly efficient precoding techniques utilizing the concepts of partitioning, aggregation and conditional coding (PACC). This combined coding strategy has proved to be very efficient both with respect to subjective and objective measures. Compared to the H.263 coder (with all options applied) we achieved improvements in the range from 0.5 to 1.2 dB PSNR. This is especially the case at very low bit-rates where reconstructed videos of block-based coders suffer from visually annoying blocking artifacts the proposed coding scheme produces a superior subjective quality.
Conference
Language
English
Keyword(s)
image reconstruction
image sequences
image texture
interpolation
motion estimation
prediction theory
video coding
wavelet transformation
very low bit rate video coding scheme
warping prediction
wavelet-based residual coding
image warping model
temporal redundancies
image sequence
bilinear warp
block adaptive high-quality texture interpolation
prediction error image
precoding techniques
partitioning aggregation conditional coding
pacc
combined coding strategy
h.263 coder
reconstructed videos
block-based coders
blocking artifacts