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Cycle spinning, a technique mainly used for wavelet de- noising, has also been shown to be successful toward image reso- lution upscaling in the wavelet domain. We propose a directional variant of the cycle spinning methodology. We obtain estimates of local edge orientation from a wavelet decomposition of the available low-resolution image and use this information to influence the choice of cycle spinning parameters that are employed for resolution upscaling. Our experimental results show that the proposed method outperforms competing methods for a wide range of images offering modest but consistent improvements both in objective as well as subjective terms. Lower computational complexity compared to the conventional cycle spinning is also demonstrated. © 2005 SPIE and

Image resolution upscaling in the wavelet domain using directional cycle spinning