Mr. Adam V. Jahraus Profile

Adam V. Jahraus

at Univ of Calgary

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Proceedings Article | 21 June 2015 Paper

Self-calibration of a structured light based scanner for use in archeological applications

Adam Jahraus, Derek Lichti, Peter Dawson

Proceedings Volume 9528, 95280E (2015) https://doi.org/10.1117/12.2184607

KEYWORDS: Calibration, Clouds, Optical spheres, Scanners, Cameras, RGB color model, Near infrared, Sensors, Spherical lenses, Data modeling

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It is frequently necessary in archaeology to map excavated features so their structure can be recorded before they are dismantled in order for the excavation to continue. This process can be time consuming, error prone and manually intensive. Three-dimensional recording devices, which have the advantage of being faster, less labor intensive and more detailed, present an attractive alternative method of mapping. A small, portable hand scanner such as the DotProduct DPI-7, could be used for this purpose. However, the three-dimensional data collected from this device contain systematic distortions that cause errors in the recorded shape of the features being mapped. The performance of the DPI-7 scanner is evaluated in this paper using self-calibration based techniques. A calibration field consisting of spherical targets rigidly mounted on a planar background was imaged from multiple locations, and the target deviations from expected locations are used to quantify the performance of the device. The largest source of systematic error in the DPI-7 data was found to be a scale error affecting dimensions orthogonal to the depth. These in-plane distortions were modeled using a single scale factor parameter in the self-calibration solution, resulting in a 54% reduction in the RMS coordinate errors.

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