一种用于dct视频编码速率控制的改进失真模型

Jun Xie, L. Chia, Bu-Sung Lee
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引用次数: 2

摘要

提出了一种基于离散余弦变换(DCT)的视频编码速率控制算法。它是基于一种更精确的率失真(R-D)模型,特别是一种新的失真量化(D-Q)模型而开发的。与以往采用统一的D-Q模型或经验失真模型不同,本文提出了一种精确的失真模型,可以定量描述失真与视频源信息和所选量化分辨率之间的关系。在了解源频系数分布和量化理论的基础上,提出了我们的失真模型。将该畸变模型与经典的R-D理论相结合,得到了一种新的速率模型。最后,在MPEG-4编码器上实现了该模型,实现了对低延迟视觉通信系统的速率控制。我们还将提出的速率控制与VM18速率控制进行了比较,结果表明它更有效
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An improved distortion model for rate control of DCT-based video coding
This paper presents a rate control algorithm for the dominant discrete cosine transform (DCT)-based video coding. It is developed based on a more accurate rate-distortion (R-D) model, specifically, a new distortion-quantization (D-Q) model. Different from previous work that employs a uniform D-Q model or an empirical distortion model, our work proposes an accurate distortion model, which can quantitatively describe the relationship of distortion with respect to video source information and the selected quantization resolution. Based on understanding the distribution of source frequency coefficients and the quantization theory, our distortion model is proposed. This distortion model is combined with the classical R-D theory to generate a new rate model. Finally, the proposed model is implemented on an MPEG-4 encoder to perform rate control for a low-delay visual communication system. We also compare the proposed rate control with the VM18 rate control and it has been shown to be more efficient
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