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Parallel Deblocking Filtering in MPEG-4 AVC/H.264 on Massively Parallel Architectures
Pieters, Bart,Hollemeersch, Charles-Frederik J,De Cock, Jan,Lambert, Peter,De Neve, Wesley,Van de Walle, Rik IEEE 2011 IEEE transactions on circuits and systems for vide Vol.21 No.1
<P>The deblocking filter in the MPEG-4 AVC/H.264 standard is computationally complex because of its high content adaptivity, resulting in a significant number of data dependencies. These data dependencies interfere with parallel filtering of multiple macroblocks (MBs) on massively parallel architectures. In this letter, we introduce a novel MB partitioning scheme for concurrent deblocking in the MPEG-4 AVC/H.264 standard, based on our idea of deblocking filter independency, a corrected version of the limited error propagation effect proposed in the letter. Our proposed scheme enables concurrent MB deblocking of luma samples with limited synchronization effort, independently of slice configuration, and is compliant with the MPEG-4 H.264/AVC standard. We implemented the method on the massively parallel architecture of the graphics processing unit (GPU). Experimental results show that our GPU implementation achieves faster-than real-time deblocking at 1309 frames per second for 1080p video pictures. Both software-based deblocking filters and state-of-the-art GPU-enabled algorithms are outperformed in terms of speed by factors up to 10.2 and 19.5, respectively, for 1080p video pictures.</P>
Brodie, Juliet,Chan, Cheong Xin,De Clerck, Olivier,Cock, J. Mark,Coelho, Susana M.,Gachon, Claire,Grossman, Arthur R.,Mock, Thomas,Raven, John A.,Smith, Alison G.,Yoon, Hwan Su,Bhattacharya, Debashish Elsevier 2017 Trends in plant science Vol.22 No.8
<P>Algae are (mostly) photosynthetic eukaryotes that occupy multiple branches of the tree of life, and are vital for planet function and health. In this review, we highlight a transformative period in studies of the evolution and functioning of this extraordinary group of organisms and their potential for novel applications, wrought by high-throughput ‘omic’ and reverse genetic methods. We cover the origin and diversification of algal groups, explore advances in understanding the link between phenotype and genotype, consider algal sex determination, and review progress in understanding the roots of algal multicellularity. Experimental evolution studies to determine how algae evolve in changing environments are highlighted, as is their potential as production platforms for compounds of commercial interest, such as biofuel precursors, nutraceuticals, or therapeutics.</P> <P><B>Trends</B></P> <P>Application of modern ‘omic and genetic methods has significantly advanced our understanding of the origin, evolution, and metabolic potential of unicellular and multicellular algae, as well as their diverse modes of sexual reproduction.</P> <P>The GreenCut proteins, a conserved gene set in the Viridiplantae, are primarily plastid targeted and have key roles in the function and regulation of photosynthesis, including the maintenance of photosynthetic reaction complexes.</P> <P>Lab evolution experiments demonstrate the strong adaptability of microalgae to environmental changes that are associated with climate change, although it is unclear whether these results will hold in natural ecosystems.</P> <P>The development of algae as ‘cell factories’ promises to allow the production of not only endogenous molecules, but also non-native compounds such as high-value pigments, bulk chemicals, or even therapeutic proteins.</P>