Fast-lapped transform for image coding

Ricardo L. de Queiroz; Trac D. Tran

doi:10.1117/12.382926

19 April 2000 Fast-lapped transform for image coding

Ricardo L. de Queiroz, Trac D. Tran

Proceedings Volume 3974, Image and Video Communications and Processing 2000; (2000) https://doi.org/10.1117/12.382926
Event: Electronic Imaging, 2000, San Jose, CA, United States

Abstract

This paper introduces a class of linear phase lapped biorthogonal transforms with basis functions of variable length. A lattice is used to enforce both linear phase and perfect reconstruction properties as well as to provide a fast and efficient transform implementation for image coding applications. In the proposed formulation which we call fast lapped transform (FLT), the higher frequency filters (basis functions) are those of the DCT, which are compact to limit ringing. The lower frequency filters (basis functions) are overlapped for representing smooth signals while avoiding blocking artifacts. A great part of the FLT computation is spent at the DCT stage, which can be implemented through fast algorithms, while just a few more operations are needed to implement the extra stages. For example, compared to the DCT, an FLT with good performance can be implemented with only 8 extra additions and 6 extra multiplications for an 8-sample block. Yet, image coding examples show that the FLT is far superior to the DCT and is close to the 9/7-tap biorthogonal wavelet in subjective coding performance.

Citation Download Citation

Ricardo L. de Queiroz and Trac D. Tran "Fast-lapped transform for image coding", Proc. SPIE 3974, Image and Video Communications and Processing 2000, (19 April 2000); https://doi.org/10.1117/12.382926

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available