A modified cosine transform

Kwok Tung Lo, Wai Kuen Cham

Research output: Journal article publicationJournal articleAcademic researchpeer-review


In this work, we propose to improve the performance of the DCT by weighting the DCT matrices with some simple structured orthonormal matrices. The new transform thus generated is called the weighted cosine transform (WCT). This method of modification ensures that fast computational algorithms exist for the WCT. Tests using both a statistical model and real images have shown that the WCT performs better than the DCT. The implementation of an order-N WCT is similar to that of the DCT. The additional computation overhead is 1.5N multiplications and N additions.
Original languageEnglish
Pages (from-to)178-186
Number of pages9
JournalJournal of Visual Communication and Image Representation
Issue number2
Publication statusPublished - 1 Jan 1993
Externally publishedYes

ASJC Scopus subject areas

  • Signal Processing
  • Media Technology
  • Computer Vision and Pattern Recognition
  • Electrical and Electronic Engineering


Dive into the research topics of 'A modified cosine transform'. Together they form a unique fingerprint.

Cite this