Advances in superresolution using L-curve

Subsequent to the work of Kim, Bose, and Valenzuela in 1990 on the simultaneous filtering and interpolation of a registered sequence of undersampled noisy and shift-invariant blur degraded images, Bose and Boo tackled in 1998 the problem of reconstructing a high-resolution image from multiple undersampled, shifted, degraded frames with subpixel displacement errors. This led to a formulation involving a periodically shift-variant system model. Lertrattanapanich and Bose advanced in 1999 a procedure for construction of a high-resolution video mosaic following the estimation of motion parameters between successive frames in a video sequence generated from a video camera. Current research is focused on simultaneous blur identification and robust superresolution. The blur is not restricted to be linear shift-invariant and could not only be of the linear shift-variant type but also some nonlinear blurs could be accommodated. The optimal tuning parameter may, if desired, be calculated analytically and not by trial-and-error