Fast downscaled inverses for images compressed with M-channel lapped transforms

Author

De Queiroz, Ricardo L. ; Eschbach, Reiner

Author_Institution

Xerox Corp., Webster, NY, USA

Volume

6

Issue

6

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

794

Lastpage

807

Abstract

Compressed images may be decompressed and displayed or printed using different devices at different resolutions. Full decompression and rescaling in space domain is a very expensive method. We studied downscaled inverses where the image is decompressed partially, and a reduced inverse transform is used to recover the image. In this fashion, fewer transform coefficients are used and the synthesis process is simplified. We studied the design of fast inverses, for a given forward transform. General solutions are presented for M-channel finite impulse response (FIR) filterbanks, of which block and lapped transforms are a subset. Designs of faster inverses are presented for popular block and lapped transforms

Keywords

FIR filters; band-pass filters; data compression; filtering theory; image coding; image reconstruction; image resolution; image sampling; inverse problems; transform coding; FIR filterbanks; M-channel lapped transforms; fast downscaled inverses; finite impulse response filterbanks; forward transform; image compression; image decompression; reduced inverse transform; Application software; Discrete cosine transforms; Discrete transforms; Discrete wavelet transforms; Finite impulse response filter; Image coding; Image resolution; Microcomputers; Printers; Transform coding;

fLanguage

English

Journal_Title

Image Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7149

Type

jour

DOI

10.1109/83.585231

Filename

585231