%0 Journal Article
%T Early Termination and Pipelining for Hardware Implementation of Fast H.264 Intraprediction Targeting Mobile HD Applications
%A Jin-Su Jung
%A Genhua Jin
%A Hyuk-Jae Lee
%J EURASIP Journal on Advances in Signal Processing
%D 2008
%I Springer
%R 10.1155/2008/542735
%X 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 4   ！4 and 16   ！16 predictions are early terminated with the threshold determined by the cost of motion estimation. In I slices, intra 4   ！4 prediction is early terminated with the threshold derived from intra 16   ！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 4   ！4 intrapredictions, the processing order of 4   ！4 blocks is changed to reduce the dependencies between consecutively processed blocks. In I slices, computation for 4   ！4 intraprediction is reduced by 19 percent with the proposed early termination. In P slices, computations for 4   ！4 and 16   ！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 0.13 ♂ ? °    m technology.
%U http://dx.doi.org/10.1155/2008/542735