Region-Based Rate-Control for H.264/AVC for Low Bit-Rate Applications
Hai-Miao Hu, Bo Li, Weiyao Lin, Wei Li, Ming-Ting Sun

TL;DR
This paper introduces a region-based rate-control scheme for H.264/AVC that adaptively allocates bits based on regional characteristics, improving coding efficiency and quality at low bit-rates.
Contribution
It proposes a novel region-based rate-control method that considers regional characteristics and uses linear models for better rate-distortion optimization.
Findings
Achieves better subjective and objective quality.
Outperforms conventional rate-control methods.
Adapts rate-control to content characteristics.
Abstract
Rate-control plays an important role in video coding. However, in the conventional rate-control algorithms, the number and position of Macroblocks (MBs) inside one basic unit for rate-control is inflexible and predetermined. The different characteristics of the MBs are not fully considered. Also, there is no overall optimization of the coding of basic units. This paper proposes a new region-based rate-control scheme for H.264/AVC to improve the coding efficiency. The inter-frame information is explored to objectively divide one frame into multiple regions based on their rate-distortion behaviors. The MBs with the similar characteristics are classified into the same region, and the entire region instead of a single MB or a group of contiguous MBs is treated as a basic unit for rate-control. A linear rate-quantization stepsize model and a linear distortion-quantization stepsize model are…
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