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In this paper, we are interested in detecting blotches in old movies. The novelty of our approach is twofold. Firstly, we study the pertinency of operating the detection in the wavelet transform domain. Secondly, we propose to resort to statistical outlier test in order to localize the underlying artifacts.

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Old films suffer from several degradations due to bad storage conditions. In our work, we are interested in detecting a special type of degradation called blotches. The aim of this paper is to improve the performances of our blotch detector proposed in a previous work, by improving the results of the motion estimation and compensation step in the special case of sequences with varying illumination. We propose a robust motion estimation method based on the phase correlation information. The experiments show a high efficiency of the proposed technique with low complexity compared to some existing estimators.

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