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H.264/AVC adopts aggressive compression algorithms at the cost of increased computational complexity. To speed up the H.264/AVC intraframe coding, this paper proposes two novel techniques: early termination and pipelined execution. In P slices, intra 4ÃƒÂ—4 and 16ÃƒÂ—16 predictions are early terminated with the threshold determined by the cost of motion estimation. In I slices, intra 4ÃƒÂ—4 prediction is early terminated with the threshold derived from intra 16ÃƒÂ—16 prediction. The threshold function is chosen as a monotonically decreasing linear function with its optimal coefficients determined by experiments. For the pipelined execution of 4ÃƒÂ—4 intrapredictions, the processing order of 4ÃƒÂ—4 blocks is changed to reduce the dependencies between consecutively processed blocks. In I slices, computation for 4ÃƒÂ—4 intraprediction is reduced by 19 percent with the proposed early termination. In P slices, computations for 4ÃƒÂ—4 and 16ÃƒÂ—16 intrapredictions are reduced by more than 81 and 91 percents, respectively. The pipelined execution reduces the computation time by 41 percent. In spite of the speed-up by the proposed methods, degradation in rate-distortion performance is negligible. The proposed pipelined execution is integrated with other H.264/AVC hardware accelerators and fabricated as an SoC using Dongbu 0.13Ã¢Â€Â‰ÃŽÂ¼m technology

Early Termination and Pipelining for Hardware Implementation of Fast H.264 Intraprediction Targeting Mobile HD Applications