Digital removal of blotches with variable semi-transparency using visibility laws

Authors:
Vittoria Bruni;Andrew Crawford;Anil Kokaram;Domenico Vitulano
Affiliations:
Istituto per le Applicazioni del Calcolo "M.Picone", C.N.R., Rome, Italy;Istituto per le Applicazioni del Calcolo "M.Picone", C.N.R., Rome, Italy and Dip. di Modelli e Metodi Matematici per le Scienze Applicate, Universitá di Roma "La Sapienza", Rome, Italy;Electronic and Electrical Engineering Department, University of Dublin, Trinity College, Ireland;Istituto per le Applicazioni del Calcolo "M.Picone", C.N.R., Rome, Italy
Venue:
BVAI'07 Proceedings of the 2nd international conference on Advances in brain, vision and artificial intelligence
Year:
2007

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Abstract

This paper presents an automatic technique that removes blotches from archived photographs. In particular, we focus on blotches caused by water and dirt that cause a variable semi-transparency in the degraded region. The proposed digital removal consists of an automatic shrinking of the blotch that preserves the original image details. This operation is based on visibility laws in the wavelet domain. Preliminary experimental results show that the proposed model is also effective on critical blotches produced by dust and dirt.