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Efficient Image Upsampling using Frequency Resolution Expansion Schemes in DCT Domain  

Park Seung-Wook (LG Electronics Digital Media Lab.)
Park Ji-Ho (LG Electronics Digital Media Lab.)
Jeon Byeong-Moon (LG Electronics Digital Media Lab.)
Park Hyun Wook (LG Electronics Digital Media Lab.)
Publication Information
Journal of Broadcast Engineering / v.10, no.4, 2005 , pp. 505-514 More about this Journal
Abstract
Image upsampling can be performed in both spatial and frequency (transform) domain. In the spatial domain, various upsampling techniques are developed and 6-tap FIR interpolation filter is most well known method, which is embedded in many video coding standards. It can provide high subjective quality but shows low objective quality. In the transform domain, simple zero padding method can produce upsampled image easily. It shows better objective quality than 6-tap filtering, but it yields ringing effects which annoy eyes. In this paper, we present efficient upsampling method using frequency addition method in transform domain to provide better subjective and objective quality than conventional method Extensive simulation results show that the proposed algorithm produces visually fine images with high PSNR.
Keywords
upsampling; 6-tap filtering; DCT upsampling; zero padding; blurring; ringing; DCT domain;
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  • Reference
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