Abstract
The H.264/AVC video coding standard introduces some improved tools in order to increase compression efficiency. Moreover, the multi-view extension of H.264/AVC, called H.264/MVC, adopts many of them. Among the new features, variable block-size motion estimation is one which contributes to high coding efficiency. Furthermore, it defines a different prediction structure that includes hierarchical bidirectional pictures, outperforming traditional Group of Pictures patterns in both scenarios: single-view and multi-view. However, these video coding techniques have high computational complexity. Several techniques have been proposed in the literature over the last few years which are aimed at accelerating the inter prediction process, but there are no works focusing on bidirectional prediction or hierarchical prediction. In this article, with the emergence of many-core processors or accelerators, a step forward is taken towards an implementation of an H.264/AVC and H.264/MVC inter prediction algorithm on a graphics processing unit. The results show a negligible rate distortion drop with a time reduction of up to 98% for the complete H.264/AVC encoder.
Highlights
Nowadays, graphics card production is booming due to the increase in demand from the video-game and game console business
5 Experimental results The proposed algorithm has been implemented in the H.264/Advanced Video Coding (AVC) JM version 17.2 reference software encoder [10]
The H.264/AVC profiles used for testing are the Main Profile and the Stereo High Profile, and the parameters used are those included in these profiles
Summary
Graphics card production is booming due to the increase in demand from the video-game and game console business. Some years ago, H.264/AVC established an extension for 2D (single view) to 3D (n-views) called H.264/MVC in order to support the sensation of 3D Both the H.264/AVC standard and its extension, MVC, adopt many improved coding tools such as multiple reference frames, weighted prediction, a de-blocking filter, variable block-size and quarter-pixel precision for Motion Compensation (MC). The highest complexity procedure has been referred to in the literature as inter prediction, and is based on a variable block-size Motion Estimation (ME) with block sizes ranging from 16 x 16 to 4 x 4, with many options available between these All these improved tools allow an optimum performance to be achieved, but at the expense of an increase in the computational complexity of the encoder.
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