HDS, a real-time multi-DSP motion estimator for MPEG-4 H.264 AVC high definition video encoding |
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Authors: | Fabrice Urban Jean-François Nezan Mickaël Raulet |
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Affiliation: | (1) Thomson CR-Video Compression Lab, 1 av. de belle fontaine, CS 17616, 35576 Cesson Sevigne, France;(2) IETR/Image group Lab, UMR CNRS 6164/INSA, 20 av. des Buttes de Coesmes, 35043 Rennes Cedex, France |
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Abstract: | H.264 AVC video compression standard achieves high compression rates at the cost of a high encoder complexity. The encoder performances are greatly linked to the motion estimation operation which requires high computation power and memory bandwidth. High definition context magnifies the difficulty of a real-time implementation. EPZS and HME are two well-known motion estimation algorithms. Both EPZS and HME are implemented in a DSP and their performances are compared in terms of both quality and complexity. Based on these results, a new algorithm called HDS for Hierarchical Diamond Search is proposed. HDS motion estimation is integrated in a AVC encoder to extract timings and resulting video qualities reached. A real-time DSP implementation of H.264 quarter-pixel accuracy motion estimation is proposed for SD and HD video format. Furthermore HDS characteristics make this algorithm well suited for H.264 SVC real-time encoding applications. |
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Keywords: | Motion estimation Digital signal processor Real-time H.264 AVC/SVC |
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