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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
- 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