An optimized template matching approach to intra coding in video/image compression
Venue
IS&T/SPIE Electronic Imaging, 2014, SPIE, pp. 1-6
Publication Year
2014
Authors
Hui Su, Jingning Han, Yaowu Xu
BibTeX
Abstract
The template matching prediction is an established approach to intra-frame coding
that makes use of previously coded pixels in the same frame for reference. It
compares the previously reconstructed upper and left boundaries in searching from
the reference area the best matched block for prediction, and hence eliminates the
need of sending additional information to reproduce the same prediction at decoder.
In viewing the image signal as an auto-regressive model, this work is premised on
the fact that pixels closer to the known block boundary are better predicted than
those far apart. It significantly extends the scope of the template matching
approach, which is typically followed by a conventional discrete cosine transform
(DCT) for the prediction residuals, by employing an asymmetric discrete sine
transform (ADST), whose basis functions vanish at the prediction boundary and reach
maximum magnitude at far end, to fully exploit statistics of the residual signals.
It was experimentally shown that the proposed scheme provides substantial coding
performance gains on top of the conventional template matching method over the
baseline.
