Metrological Evaluation of the Demosaicking Effect on Colour Digital Image Correlation with Application in Monitoring of Paintings

A modified 3D colour digital image correlation method (3D cDIC) is proposed for efficient displacement measurements of colour objects with natural texture. The method is using a separate analysis of correlation coefficient (sigma) value in the RGB channels of CCD cameras by utilising local informati...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2022-09, Vol.22 (19), p.7359
Main Authors: Papanikolaou, Athanasia, Garbat, Piotr, Kujawinska, Malgorzata
Format: Article
Language:English
Subjects:
Accuracy
Algorithms
Cameras
canvas paintings
CCD cameras
Channels
colour digital image correlation
Correlation coefficients
Cultural heritage
Data processing
demosaicking
DIC metrology
Digital imaging
Displacement
Electronic cameras
Image filters
natural texture
Pharmaceutical industry
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Summary:A modified 3D colour digital image correlation method (3D cDIC) is proposed for efficient displacement measurements of colour objects with natural texture. The method is using a separate analysis of correlation coefficient (sigma) value in the RGB channels of CCD cameras by utilising local information from the channel with the minimum sigma. In this way, merged U, V and W displacement maps are generated based on the local correlation quality. As the proposed method applies to colour filter array cameras, the images in RGB channels have to undergo a demosaicking procedure which directly influences the accuracy of displacement measurements. In the paper, the best performing demosaicking methods are selected. The metrological analysis of their influence on the results of canvas paintings investigations obtained by unmodified and modified 3D cDIC processing is presented.
ISSN:1424-8220
1424-8220
DOI:10.3390/s22197359