Low complexity real-time video transcoders for mobile video applications

2008 International Symposium on a World of Wireless, Mobile and Multimedia Networks Pub Date : 2008-06-23 DOI:10.1109/WOWMOM.2008.4594913

K. Ozawa, Hironori Ito, Kazuteru Watanabe, R. Takeshima, Kazuhiro Koyama

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引用次数: 1

Abstract

This paper proposes low complexity real-time video transcoders based on both H.264 (AVC) and MPEG-4 which are suitable for mobile video applications. The transcoders proposed are PT (Picture Type Transcoder) and ST (Syntax Transcoder) and are used for video upload, delivery and video conference applications. In PT, relationship among PSNR, QP values and code length is obtained for H.264 baseline profile (BP) by simulation experiment to determine suitable QP values. Further, video mixing function for displaying multiple pictures at the same time in video conference application in which the proposed PT can be applied is described. The proposed PT and ST are implemented on a high-performance DSP, and complexity of PT and ST is compared with that of CPDT (Cascaded Pixel Domain Transcoder) for both H.264 BP and MPEG-4 simple profile (SP) cases. The complexity of the proposed PT and ST is very low. The complexity of PT is less than 1/3 of CPDT at both 64 kbps (QCIF) and 384 kbps (CIF) in H.264 BP.

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用于移动视频应用的低复杂性实时视频转码器

本文提出了一种适合移动视频应用的基于H.264 (AVC)和MPEG-4的低复杂度实时视频转码器。提出的转码器是PT(图片类型转码器)和ST(语法转码器)，用于视频上传、传输和视频会议应用。在PT中，通过仿真实验得到H.264基线剖面(BP)的PSNR、QP值与码长之间的关系，确定合适的QP值。此外，还描述了在视频会议应用中同时显示多幅图片的视频混合功能，其中可以应用所提出的PT。在高性能DSP上实现了PT和ST，并将PT和ST的复杂度与H.264 BP和MPEG-4简单轮廓(SP)情况下的CPDT(级联像素域转码器)的复杂度进行了比较。所建议的PT和ST的复杂性非常低。在H.264 BP的64 kbps (QCIF)和384 kbps (CIF)下，PT的复杂度都小于CPDT的1/3。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2008 International Symposium on a World of Wireless, Mobile and Multimedia Networks

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