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We describe a fast VLSI architecture for full-search motion estimation for the blocks with 7 different sizes in MPEG-4 AVC/H.264. The proposed variable block size motion estimation (VBSME) architecture consists of a 16x16 PE array, an adder tree and comparators to find all 41 motion vectors and their minimum SADs for the blocks of 16x16, 16x8, 8x16, 8x8, 8x4, 4x8 and 4x4. It employs a 2-D datapath and its control of the search area data is simple and regular. The proposed VBSME can achieve 100% PE utilization by employing a preload register and a search data buffer inside each PE and allow real-time processing of 4CIF(704x576) video with 15 fps at 100 Mhz for a search range of [-32~+31].

A fast VLSI architecture for full-search variable block size motion estimation in MPEG-4 AVC/H.264