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Journal Article Discrete-cosine-transform-domain Downsizing with Windowing Operation
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Authors
Il Hong Shin, Jung Ju Yoo, Jin Woo Hung
Issue Date
2007-12
Citation
Journal of Electronic Imaging, v.16, no.4, pp.1-3
ISSN
1017-9909
Publisher
SPIE,IS&T
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1117/1.2818176
Project Code
07MR2900, Development of Ubiquitous Content Access Technology for Convergence of Broadcasting and Communications, Yoo Jeong Ju
Abstract
A simple and effective method is presented for discrete-cosine-transform (DCT)-domain downsizing. Various methods employed in DCT-domain downsizing simply reuse the frequency component of DCT, which shows a severe aliasing effect. The proposed approach extends the downsizing method for alleviating or reducing the aliasing effect with a windowing operation, which adjusts the magnitude of the DCT coefficient. Visual inspection showed satisfactory results, with no complexity overhead and performance degradation regarding the peak-signal-to noise ratio (PSNR) after upsampling. © 2007 SPIE and IS&T.
KSP Keywords
Aliasing effect, DCT coefficients, Frequency components, performance degradation, visual inspection