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Polyphase back-projection filtering for resolution enhancement of image sequences

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3 Author(s)
Cohen, B. ; Dept. of Electr. & Comput. Eng., Ben-Gurion Univ. of the Negev, Beer-Sheva, Israel ; Avrin, V. ; Dinstein, I.

A method for resolution enhancement of image sequences by polyphase back-projection filtering is presented. The first super-resolution image is initialized by interpolation of the first low-resolution image. The imaging system is simulated for every super-resolution image at a time, and the error between the simulated image and the corresponding low-resolution image is calculated. The resolution enhancement is achieved by back-projecting this error to the corresponding super-resolution image. The imaging system's PSF and the back-projection filter are estimated with a resolution higher than that of the super-resolution images, and the filtering is done by polyphase versions of these filters. The polyphase filters have embedded sub-pixel displacements corresponding to the translation parameters between the super-resolution image and the low-resolution one. The use of the polyphase filters allows exploitation of the observed data without any smoothing and/or interpolation operations. Also, no modeling of the PSF by an analytical function is necessary. Presented experimental results show encouraging resolution enhancements

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Acoustics, Speech, and Signal Processing, 2000. ICASSP '00. Proceedings. 2000 IEEE International Conference on  (Volume:6 )

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