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Báo cáo hóa học: " FMO-based H.264 frame layer rate control for low bit rate video transmission"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : FMO-based H.264 frame layer rate control for low bit rate video transmission | Cajote et al. EURASIP Journal on Advances in Signal Processing 2011 2011 63 http asp.eurasipjournals.eom content 2011 1 63 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access FMO-based H.264 frame layer rate control for low bit rate video transmission Rhandley D Cajote1 Supavadee Aramvith1 and Yoshikazu Miyanaga2 Abstract The use of flexible macroblock ordering FMO in H.264 AVC improves error resiliency at the expense of reduced coding efficiency with added overhead bits for slice headers and signalling. The trade-off is most severe at low bit rates where header bits occupy a significant portion of the total bit budget. To better manage the rate and improve coding efficiency we propose enhancements to the H.264 AVC frame layer rate control which take into consideration the effects of using FMO for video transmission. In this article we propose a new header bits model an enhanced frame complexity measure a bit allocation and a quantization parameter adjustment scheme. Simulation results show that the proposed improvements achieve better visual quality compared with the JM 9.2 frame layer rate control with FMO enabled using a different number of slice groups. Using FMO as an error resilient tool with better rate management is suitable in applications that have limited bandwidth and in error prone environments such as video transmission for mobile terminals. 1. Introduction The H.264 AVC standard 1 has received much attention recently because of its high coding efficiency error robustness and network friendly architecture. The standard was designed to address a broad class of conversational broadcast and interactive multimedia services for both wired and wireless environments. The H.264 AVC has the biggest impact in applications where bandwidth is a limiting constraint and robustness to transmission errors is required. An application such as video transmission for mobile wireless environments is a good example where low bit .