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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
Publication Date: 2012/11/01
Online ISSN: 1745-1337
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: Digital Signal Processing
lapped transform, image coding, filter bank, downsampling factor, JPEG,
Full Text: PDF(3.8MB)>>
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.