WAVELETS AND SPLINES FOR VERTICAL SCRATCH REMOVAL IN OLD MOVIE SEQUENCES
Patrizia Ciarlini, Giuseppe Costanzo, MARIA LAURA LO CASCIO · International Journal of Wavelets Multiresolution and Information Processing · 2006
In old movies, scratches are common damages that mostly result from a mechanical stress during the projection. A method for removing vertical scratches is proposed and suitable to be automatically applied to sequences of images. The method uses a wavelet decomposition of the original digital image, I, in order to separate the high frequency components and to elaborate corrupted data in the regular matrix, A, and in the vertical details matrix, V, only. For A, approximating functions are constructed in suitable spline spaces, which depend on the morphological quality of the image near the scratch. Monochromatic old images and images with simulated scratches have been considered to validate the method.