Window-level rate control for smooth picture quality and smooth buffer occupancy
Window-level rate control for smooth picture quality and smooth buffer occupancy
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DOI：
10.1109/pcs.2009.5167420
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发表时间：
2009-05
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影响因子：
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通讯作者：
Long Xu;Zhihang Wang;Lei Deng;Xiangyang Ji;Debin Zhao;Wen Gao
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文献类型：
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作者：
Long Xu;Zhihang Wang;Lei Deng;Xiangyang Ji;Debin Zhao;Wen Gao
传统上，速率控制由R-QP模型上的比特分配和QP决策组成。在位分配中，如果缓冲区溢出，目标位将受到进一步限制。同时，码率控制还应提供尽可能流畅的图像质量。然而，图像质量和编码参数之间没有明确的关系，因此图像质量的编码结果通常是不可预测和不可控的。在画面质量流畅的条件下，缓冲区占用流畅当然是优选的。在我们的工作中，我们首先提出了一个“窗口模型”，它制定了窗口的大小以及图像质量和缓冲区占用率的变化。因此，在给定图像质量和缓冲区占用的约束下，采用窗口模型可以期望得到符合要求的编码结果。其次，引入了受传统 ρ 域模型启发的窗口级率失真（RD）模型。最后，通过详细的实验对我们的建议进行了评估。
Traditionally, rate control consists of bit allocation and QP decision on R-QP model. In bit allocation, target bits is further confined if buffer overflows. Meanwhile, rate control should also give as smooth as possible picture quality. However, there is no explicit relationship between picture quality and encoding parameters, so the coding result on picture quality is usually unpredictable and uncontrollable. On the condition of smooth picture quality, the smooth buffer occupancy is preferable certainly. In our work, we first proposed a “window model” formulating the size of window and variations of picture quality and buffer occupancy. Thus, given the constraint on picture quality and buffer occupancy, the compliant coding result about them can be expected employing window model. Second, a window-level rate distortion (RD) model inspired by the traditional ρ-domain model is introduced. Lastly, the evaluation of our proposal is presented with elaborate experiments.