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http://dx.doi.org/10.3745/KIPSTB.2002.9B.6.745

A Study on the Guided Search Method for Transcoding MPEG2 P frame to H.263 P frame in a Compressed Domain  

Um, Sung-Min (숭실대 대학원 컴퓨터공학)
Kang, Eui-Seon (숭실대 대학원 컴퓨터공학)
Lim, Young-Wan (숭실대학교 미디어학부)
Hwang, Jae-Gak (한국전자통신연구원 책임기술원)
Publication Information
The KIPS Transactions:PartB / v.9B, no.6, 2002 , pp. 745-752 More about this Journal
Abstract
The purpose of the paper is to enable a format transcoding between a heterogeneous compression format in a real time, and to enhance the compression ratio using characteristics of the compressed frame. In this paper, for the heterogeneous format transcoding, we tried to transcode from MPEG2 having a lower compression ratio to H.263 having a higher compression ratio. After analyzing MPEG 2 bit stream and H.263 bit stream of the same original video, we found that the number of intra coded macro blocks in MPEG 2 data is much higher than the number of the intra coded macro blocks in H.263 data. In the process of P frame generation, a intra coded macro block is generated when a motion estimation value representing the similarity between the previous frame and current frame does not meet a threshold. Especially the intra coded macro block has a great impact on the compression ratio. Hence the paper, we tried to minimize the number of intra coded macro blocks in H.263 data stream which is transcoded from MPEG 2 in a compressed domain. For the purpose, we propose a guided search method for transcoding the INTRA coded block into INTER coded block using the information about motion vectors surrounding the intra macro block in order to minimize the complexity of the motion estimation process. The experimental results show that the transcoding of MPEG 2 into H.263 can be done in a real time successfully.
Keywords
Format Transcoding; Guided search Algorithms;
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