A novel spatio-temporal method for blotch detection in the wavelet transform domain

In this paper, we are interested in detecting blotches in old movies using spatial and temporal information of the sequence. The contribution of our approach is three-fold. Firstly, unlike conventional methods, we proceed to the detection in the wavelet transform domain instead of the spatial domain. Secondly, the detection of the possible corrupted coefficients in each subband and at each resolution level involves a specific multiple outlier statistical test. Finally, a coarse-to-fine strategy is carried out to capture the interscale persistency of the coefficients in order to estimate the positions of the corrupted pixels in the full resolution image.