Video coding using lapped orthogonal transform

Hirohisa Jozawwa*, Hiroshi Watanabe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


An orthogonal transform is an essential technique for reducing the spatial redundancy of image signals. In the orthogonal transforms. Discrete cosine Transform (DCT) has been most successfully applied to image codings, since it provides a high compression ratio. However, DCT coding produces discontinuous noise at block boundaries called 'blocking effect' which degrades lowbit-rate coded images. To reduce the blocking effect, lapped orthogonal transform (LOT) has been proposed. This paper proposes an intrafield-interframe-adaptive LOT and an LOT domain decimation to apply LOT to a scalable compatible video coding.

Original languageEnglish
Pages (from-to)71-78
Number of pages8
JournalNTT R and D
Issue number1
Publication statusPublished - 1993
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


Dive into the research topics of 'Video coding using lapped orthogonal transform'. Together they form a unique fingerprint.

Cite this