Flexible Combination of Time-Domain Lapped Transforms with Various Downsampling Factors

Yuichi TANAKA  Madoka HASEGAWA  Shigeo KATO  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E95-A   No.11   pp.2049-2058
Publication Date: 2012/11/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E95.A.2049
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: Digital Signal Processing
lapped transform,  image coding,  filter bank,  downsampling factor,  JPEG,  

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In this paper, we present a method to combine lapped transforms with various downsampling factors. The factor is changed depending on a local feature of a given signal, and it can be realized by using time-domain lapped transforms. In image coding application, our method maintains good image coding performance for a wide range of bitrates and fills the gap between undersampled and critically-/oversampled systems.