Motion vector re-estimation for fractional-scale video transcoding

Lap Pui Chau, Yong Qing Liang, Yap Peng Tan

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

9 Citations (Scopus)


In video transcoding, the compressed video is often converted to a lower resolution in order to reduce the bit rate. One way to achieve this is to first decompress the compressed video, down-sample each frame, and then re-compress the down-scaled frame sequences. This method can obtain high-quality compressed video bit-streams; however, it involves motion vector estimation that is computationally complex. Recently, some transcoding techniques have been proposed to compute the motion vectors for a compressed video with lower resolution using the motion vectors directly from the original compressed video. These techniques, however, cannot be used in arbitrary-size video down-scaling, e.g for converting CIF (Common Intermediate Format) video to sub-QCIF (Quarter CIF) video or QCIF to sub-QCIF. In this paper, we propose a video transcoding method that can estimate the motion vectors for arbitrary-size down-scaled video. It can provide video quality that is comparable to full-search motion estimation but with very low computational complexity.

Original languageEnglish
Title of host publicationProceedings - International Conference on Information Technology
Subtitle of host publicationCoding and Computing, ITCC 2001
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)0769510620, 9780769510620
Publication statusPublished - Apr 2001
Externally publishedYes
EventInternational Conference on Information Technology: Coding and Computing, ITCC 2001 - Las Vegas, United States
Duration: 2 Apr 20014 Apr 2001

Publication series

NameProceedings - International Conference on Information Technology: Coding and Computing, ITCC 2001


ConferenceInternational Conference on Information Technology: Coding and Computing, ITCC 2001
Country/TerritoryUnited States
CityLas Vegas

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Computer Science Applications
  • Information Systems
  • Software


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