Abstract
In this paper we present a colour calibration framework for cultural heritage preventive conservation. It includes a custom colour chart based on a regular sRGB division and a multi-dimensional calibration approach based on hyper-surfaces that map the original colours to the calibrated space taking information from all the channels. As shown, our work outperforms past proposals. This solution has been designed to be automatic and match the requirements of our cultural heritage surveillance framework needs, such as non-invasiveness and easiness to deploy. Its performance has been compared to publicly available calibration proposals and charts, and their results judged basing on the context and restrictions of the intended goal, such as illumination. Conclusions on the need for adapting technological solutions to the context of the goal, its cases of use when valid and self-designed methods are drawn. This work is part of the MIPAC-CM project.
Highlights
C ULTURAL heritage preservation has been a major concern of the worldly digital and information horizon for the past years, being included in the agendas of governmental organisms [1]
In a previously published paper, we introduced a cultural heritage preservation framework based on image crowdsourcing [15]
In our previous work we proposed a calibration scheme based on linear interpolation in the sRGB space layers of the acquired images that improved other state-ofart proposals with similar goal, relying on a set of reference colours present on a chart additional to the dosimeters
Summary
C ULTURAL heritage preservation has been a major concern of the worldly digital and information horizon for the past years, being included in the agendas of governmental organisms [1]. Proposals for achieving a successful cultural conservation involving digital technology, have been launched in big numbers [2], especially considering the wide meaning of the term and the different possibilities of its fulfilment. It is desirable that the prevention system is the least invasive to the piece as possible This implies that its presence should, by any means, not damage the piece, nor having physical contact with it, and being as less noticeable by third parties as possible. This leaves space for any kind of monitoring deployment involving a variety of sensing-related approaches [4]. Image acquisition related means are proposed, as image data are considered as valid for heritage preservation as a noninvasive method [8]
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