✦ LIBER ✦

A new rate control scheme for H.263 video transmission

✍ Scribed by Chi-Chang Kuo; Jin-Jang Leou

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 414 KB
Volume: 17
Category: Article
ISSN: 0923-5965
DOI: 10.1016/s0923-5965(02)00035-8

No coin nor oath required. For personal study only.

✦ Synopsis

In some image/video applications, the variable bit rate image/video bitstream will be transmitted over a constant bit rate transmission channel, in which a channel buffer is employed. In this study, a new rate control scheme for H.263 video transmission is proposed. Three proposed techniques include: preprocessing the INTRA coded macroblock (MB) incorporated the just-noticeable-distortion (JND) concept, constructing a bit estimation model in the frequency domain (instead of the bit estimation model in the spatial domain employed in Test Model Near-term version 11 (TMN11)), and adjusting quantization parameter (QP) for each MB by a Lagrangian optimization strategy.

In the proposed approach, the target number of bits for a video frame is first obtained by using a simple rate control procedure for the frame layer. The proposed JND preprocessing is applied on all the INTRA coded MBs so that the number of coded bits for a scene changed frame will decrease, without any perceptual loss. Within the MB layer, instead of the bit estimation model in the spatial domain employed in TMN11, a bit estimation model in the frequency domain, directly depending on discrete cosine transform coefficients, is proposed. Then the Lagrange multiplier is used to determine the optimal QP for each MB. The resulting QP and number of coded bits of the current MB are fed backward to update the parameters of the bit estimation model.

Based on the simulation results obtained in this study, the proposed approach can meet the target bit rate more accurately, keep a lower channel buffer fullness (delay), and have a larger average frame rate than TMN11, whereas the peak signal-to-noise ratio value and the processing time of the proposed approach are ''approximately'' as good as that of TMN11.

📜 SIMILAR VOLUMES

A light weight dynamic rate control sche

A light weight dynamic rate control scheme for video transmission over IP network

✍ Imran Bashir; Kamesh R Namuduri; Ravi Pendse 📂 Article 📅 2004 🏛 Elsevier Science 🌐 English ⚖ 354 KB

This paper proposes a lightweight dynamic rate control strategy for improving the quality of video transmitted over the internet. The proposed scheme includes a feedback mechanism from the receiver to the sender with periodic updates of packet drops. This information is used by the sender to estimat

A rate adaptation transcoding scheme for

A rate adaptation transcoding scheme for real-time video transmission over wireless channels

✍ Zhijun Lei; Nicolas D. Georganas 📂 Article 📅 2003 🏛 Elsevier Science 🌐 English ⚖ 317 KB

In this work, we investigate the problem of bit-rate adaptation transcoding for transmitting video over burst-error wireless channels, i.e., channels such that errors tend to occur in clusters during fading periods. In particular, we consider a scenario consisting of packet-based transmission with a

A New Rate Control Strategy for the MPEG

A New Rate Control Strategy for the MPEG Video Coding Algorithm

✍ Masahisa Kawashima; Cheng-Tie Chen; Fure-Ching Jeng; Sharad Singhal 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 439 KB

In this paper, we describe a new rate control strategy for the MPEG video coding algorithm. The presented strategy assigns quantizer step sizes considering the spatial activity of the coded area, and changes the bit allocation to each coding mode dynamically so that the ratio of quantizer step sizes