Lapped Transforms in a JPEG 2000 Coder

Rafael Oliveira, Ricardo de Queiroz

DOI: 10.14209/sbrt.2007.31317

Evento: XXV Simpósio Brasileiro de Telecomunicações (SBrT2007)

Keywords: Transformadas sobrepostas Wavelets JPEG 2000 EBCOT

Abstract

JPEG-2000 is the latest image coding standard and is based on wavelet transforms and dyadic spectral decompositions. We have adapted the JPEG-2000 image coder for use with uniform transforms, by replacing the wavelet stage by lapped transforms. We set code-blocks that do not cross subband boundaries and encode the lapped transform coefficients directly as if they were wavelet ones. Results indicate a sizeable gain in PSNR for a number of images and corroborate previous results indicating typical gains of lapped transforms over wavelets in image compression.

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