Context-based defading of archive photographs

Authors:
V. Bruni;G. Ramponi;A. Restrepo;D. Vitulano
Affiliations:
Istituto per le Applicazioni del Calcolo, Rome, Italy;DEEI, Università di Trieste, Trieste, Italy;DEEI, Università di Trieste, Trieste, Italy and Departmento de Ingenêria Eléctrica y Electrõnica, Universidad de los Andes, Bogota, Colombia;Istituto per le Applicazioni del Calcolo, Rome, Italy
Venue:
Journal on Image and Video Processing - Special issue on image and video processing for cultural heritage
Year:
2009

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Abstract

We present an algorithm for the enhancement of contrast in digitized archive photographic prints. It aims at producing an adaptive enhancement based on the local context of each pixel and is able to operate without direct user's intervention. A relation between the variation of contrast at different resolutions and the local Lipschitz regularity of the image is exploited. In this way, each pixel is defaded according to its nature: noise, edge, or smooth region. This strategy provides for an algorithm that drastically reduces typical, annoying artifacts like halo effects and noise amplification.