Video extraction for fast content access to MPEG compressed videos

Jianmin Jiang, Ying Weng

Research output: Journal PublicationArticlepeer-review

10 Citations (Scopus)

Abstract

As existing video processing technology is primarily developed in the pixel domain yet digital video is stored in compressed format, any application of those techniques to compressed videos would require decompression. For discrete cosine transform (DCT)-based MPEG compressed videos, the computing cost of standard row-by-row and column-by-column inverse DCT (IDCT) transforms for a block of 8 × 8 elements requires 4096 multiplications and 4032 additions, although practical implementation only requires 1024 multiplications and 896 additions. In this paper, we propose a new algorithm to extract videos directly from MPEG compressed domain (DCT domain) without full IDCT, which is described in three extraction schemes: 1) video extraction in 2 × 2 blocks with four coefficients; 2) video extraction in 4 × 4 blocks with four DCT coefficients; and 3) video extraction in 4 × 4 blocks with nine DCT coefficients. The computing cost incurred only requires 8 additions and no multiplication for the first scheme, 2 multiplication and 28 additions for the second scheme, and 47 additions (no multiplication) for the third scheme. Extensive experiments were carried out, and the results reveal that: 1) the extracted video maintains competitive quality in terms of visual perception and inspection and 2) the extracted videos preserve the content well in comparison with those fully decompressed ones in terms of histogram measurement. As a result, the proposed algorithm will provide useful tools in bridging the gap between pixel domain and compressed domain to facilitate content analysis with low latency and high efficiency such as those applications in surveillance videos, interactive multimedia, and image processing.

Original languageEnglish
Pages (from-to)595-605
Number of pages11
JournalIEEE Transactions on Circuits and Systems for Video Technology
Volume14
Issue number5
DOIs
Publication statusPublished - May 2004
Externally publishedYes

Keywords

  • Content access to compressed images and videos
  • MPEG
  • Video extraction

ASJC Scopus subject areas

  • Media Technology
  • Electrical and Electronic Engineering

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