Abstract
We present a technique for the multi-sensor registration of featureless datasets based on the photogrammetric tracking of the acquisition systems in use. This method is developed for the in situ study of cultural heritage objects and is tested by digitizing a small canvas successively with a 3D digitization system and a multispectral camera while simultaneously tracking the acquisition systems with four cameras and using a cubic target frame with a side length of 500 mm. The achieved tracking accuracy is better than 0.03 mm spatially and 0.150 mrad angularly. This allows us to seamlessly register the 3D acquisitions and to project the multispectral acquisitions on the 3D model.
Highlights
Multispectral images, on the other hand, provide precise information about the surface reflectance properties of an object
Our goal is to develop a method that permits the registration of featureless 3D models and multispectral acquisitions, for the study of cultural heritage objects
The camera calibrations were done at different moments: the tracking cameras were calibrated a few days earlier, while the multispectral camera was calibrated on the following day
Summary
Multispectral images, on the other hand, provide precise information about the surface reflectance properties of an object. With accurate photometric calibration procedures it is possible to extract data that are independent from both the acquisition system in use and the illumination conditions. This contactless analysis technique can be a step in non-invasive pigment identification [1]. The annotation of 3D models and the integration of complementary techniques is widely used for the study of cultural heritage [2,3,4,5]. There have been some attempts at creating integrated 3D/multispectral acquisition systems [6,7,8,9,10] for the study of cultural heritage objects. Using separate systems for the 3D and multispectral (2D) acquisitions enables us to independently choose the most suitable for the given application
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