Efficient Bit-Rate Estimation for Mode Decision of H.264/AVC
ICIAR '08 Proceedings of the 5th international conference on Image Analysis and Recognition
CABAC based bit estimation for fast H.264 RD optimization decision
CCNC'09 Proceedings of the 6th IEEE Conference on Consumer Communications and Networking Conference
Highly parallel rate-distortion optimized intra-mode decision on multicore graphics processors
IEEE Transactions on Circuits and Systems for Video Technology
Parallel fast inter mode decision for H.264/AVC encoding
Journal of Visual Communication and Image Representation
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To achieve the highest coding efficiency, H.264/AVC uses rate-distortion optimization technique. This means that the encoder has to code the video by exhaustively trying all the mode combinations including the different intra- and inter-prediction modes. Therefore, the complexity and computation load of video coding in H.264/AVC increase drastically compared to any previous standards. To reduce the complexity of rate-distortion cost computation, we propose a fast bit rate estimation technique to avoid the entropy coding method during intra- and inter-mode decision of H.264/AVC. The estimation method is based on the properties of context-based variable length coding (CAVLC). The proposed rate model predicts the rate of a 4 times 4 quantized residual block using five different tokens of CAVLC. Experimental results demonstrate that the proposed estimation method reduces about 47% of total encoding time on using intra-modes only and saves about 34% of total encoding time on using both inter- and intra-modes with ignorable degradation of coding performance when the fast motion search algorithm is used. When full search motion estimation algorithm is used, the proposed algorithm reduces about 17% of total encoding time.