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Nearest-neighbor intra prediction for screen content video coding | IEEE Conference Publication | IEEE Xplore

Nearest-neighbor intra prediction for screen content video coding


Abstract:

Screen content video coding is becoming increasingly important in various applications, such as desktop sharing, video conferencing, and remote education. In general, com...Show More

Abstract:

Screen content video coding is becoming increasingly important in various applications, such as desktop sharing, video conferencing, and remote education. In general, compared to natural camera-captured content, screen content has different characteristics, such as sharp edges. In this paper, we propose a novel intra prediction scheme for screen content video. In the proposed scheme, bilinear interpolation in angular intra prediction in HEVC is selectively replaced by nearest-neighbor (NN) interpolation to preserve the sharp edges in screen content video. We present two different variants of NN interpolation. In the first implicit pixel-based method, both the encoder, and the decoder determine whether to perform NN interpolation based on the prediction pixels. The second method comprises of the encoder performing a Rate-Distortion search at a block-level, and explicitly signaling a flag to the decoder to indicate when to use the NN interpolation. Both the proposed variants provide significant gains over HEVC, and simulation results show that average gains of 3.3% BD-bitrate are achieved for screen content video. The HEVC proposal of this method was accepted in the core experiments, and would be a technology under consideration in the ongoing Screen Content Coding extension of HEVC scheduled to begin in March 2014.
Date of Conference: 27-30 October 2014
Date Added to IEEE Xplore: 29 January 2015
Electronic ISBN:978-1-4799-5751-4

ISSN Information:

Conference Location: Paris, France

References

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