An Efficient Intra Prediction Algorithm for H.264/AVC High Profile

[[abstract]]A simple, highly efficient intra prediction algorithm to reduce the computational complexity of H.264/AVC High Profile is proposed. The algorithm combines two methods. The first method is a quant-based block-size selection decision that is based on the sum of the quantization AC coefficients among intra 8 × 8 mode predictions, combined with an error adjustment to select either intra 4 × 4 or intra 16 × 16 mode predictions. The second method is a novel direction-based prediction mode decision that is used to reduce the possible prediction modes for the rate-distortion (RD) optimization technique. Our experimental results demonstrate that the proposed algorithm reduces the encoding time by approximately 54% compared with that needed for an exhaustive search using the joint model reference software. The peak signal-to-noise ratio degradation is negligible, and the bit rate increment is minimal. Furthermore, the results show that our algorithm achieves a significant improvement in both computation performance and RD performance as compared with the existing algorithms.[[notice]]補正完畢[[incitationindex]]EI[[booktype]]電子

An Efficient Intra Skip Decision Algorithm for H.264/AVC Video Coding

[[abstract]]In this study, we propose a simple, highly efficient intra skip decision algorithm to reduce the computational complexity of H.264/AVC coding. It utilizes information such as the best mode and the rate value of the RD cost function, which are all pre-calculated. These values are calculated in the corresponding macroblock (MB) of the previous frame and the neighbouring MBs of the current frame in order to develop an intra skip decision rule. Our experimental results demonstrated that without the additional time-consuming computation, the proposed algorithm reduces encoding time by approximately 50% compared with the time needed for an exhaustive search and it significantly increases the time saving by 17%-30% compared with the existing algorithms. In addition, our experimental results showed that the differences in peak signal-to-noise ratio degradation are negligible and the bit rate increment is minimal.[[notice]]補正完畢[[journaltype]]國內[[incitationindex]]EI[[ispeerreviewed]]Y[[booktype]]電子版[[countrycodes]]TW