Image-resolution enhancement by polyphase FIR Wiener filtering

Beny Cohen; Its'hak Dinstein

doi:10.1117/12.365862

18 October 1999 Image-resolution enhancement by polyphase FIR Wiener filtering

Beny Cohen, Its'hak Dinstein

Proceedings Volume 3808, Applications of Digital Image Processing XXII; (1999) https://doi.org/10.1117/12.365862
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

A method for reconstruction and restoration of super resolution images from sequences of noisy low-resolution images is presented. After estimating the projective transformation parameters between a selected reference image and the observed degraded image sequence frames, the data is rearranged into a sequence with only quantized sub pixel translations. Next, the imaging system's point spread function (PSF) and the auto-correlation function of the image are estimated with a resolution higher than that of the super resolution image. The coefficients of the FIR Wiener filter are computed, low-pass filtered, and decimated so a polyphase filter bank is obtained. Each one of the images in the translated rearranged sequence is filtered by its corresponding polyphase filter. These filtering results are summed and locally normalized according to the apparent data. The super resolution result is refined by estimating the values of pixels that could not be reconstructed by interpolation. The use of the polyphase filters allows exploitation of the input data without any averaging operations needed when implementing conventional FIR Wiener filtering. The presented experimental results show good resolution improvement in presence of noise.

Citation Download Citation

Beny Cohen and Its'hak Dinstein "Image-resolution enhancement by polyphase FIR Wiener filtering", Proc. SPIE 3808, Applications of Digital Image Processing XXII, (18 October 1999); https://doi.org/10.1117/12.365862

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