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THE EXAMPLE OF THE WIDE ANGLE LENS APPLICATION IN HISTORICAL BASEMENT REGISTRATION

Michał Kowalczyk

Abstract

The aim of this paper is to analyze the possibility to use a wide angle lens for historical basements investigation. For this purpose the test site located in the Bieli?ski Palace in Otwock Wielki, Poland, was chosen. In order to generate a dense point cloud Agisoft PhotoScan was used. Reconstruction results were compared both with the Terrestrial Laser Scanner point cloud and data acquired from a normal lens camera. The main advantage of the point cloud acquired by the wide angle lens is the higher robustness of camera positions in case whem thei number is limited. It should be noticed that this aspect allows to create a geometrically correct three dimensional model of an investigated object. Additionally, while a bigger area is covered by images, the distance between the camera position and the object surface can be considerably reduced. That potentially allows for tight registration of objects, typically placed in the basement area. Beside those positive features, there are also disadvantages in lens application. Usually a large range of systematic error values of image projection occur, but if properly corrected and stable, they may be neglected. Real problems appear due to the optical resolution decrease in image edge areas and existing vignetting of image illumination. Comparison between the use of both lens types has been also taken into account and presented in this paper.

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DOI resolver: doi.org/10.5593/sgem2018/2.3/s10.027

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