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This paper describes an H.264/AVC MP@L4.1 quarter-pel motion estimation processor core for a low power video encoder. It supports macro block adaptive frame field (MBAFF) encoding and bi-directional prediction for a resolution of 1920 times 1080 pixels at 30 fps which havenpsilat been realized by conventional methods yet. The proposed processor consists of four modules for low power consumption: a module for an integer-pel motion estimation, a segmentation-free rectangle-access search window buffer, a module for quarter-pel motion estimation, and a module reducing candidate motion vectors. We propose an adaptive algorithm that reduces a workload and power in quarter-pel motion estimation. The algorithm and architecture for the candidate motion vectors reduction suppress a workload of the following process. The processor core has been designed in a 90 nm CMOS technology. The core size is 6.0 times 6.0 mm2. With this core, two reference frame can be handled, and 160.1 mW is consumed at 1.0 V.
Date of Conference: Aug. 31 2008-Sept. 3 2008