Abstract
Calibration is an important step of 3D structured light laser scanners to be able to obtain an accurate measuring result. During the calibration a relation between the pixels in 3D laser scanner camera image and the real world units is made. Laser line detection method as part of the calibration process plays an important role in this calibration process, but this aspect has not been investigated before. In this paper the calibration and measurement result dependency from the laser line detection with pixel or sub-pixel resolution in the calibration process has been investigated. The calibration process of the developed 3D laser scanner has been described. The results show dependency between the laser line detection method in the calibration process and the final measurement results. DOI: http://dx.doi.org/10.5755/j01.eee.21.6.13765
Highlights
Calibration is a process in 3D laser scanners by which a relation between the camera image pixels and the real world units are made
Following A, B, C, D parameters were obtained with pixel and sub-pixel laser line detection methods, as shown in Table I and Table II
After the laser line detection from image the detected laser line is converted to real world mm using two A, B, C, D parameters (A, B, C, D with pixel and sub-pixel laser line detection method) gained in the calibration process
Summary
Calibration is a process in 3D laser scanners by which a relation between the camera image pixels and the real world units are made. Other calibration methods calibrate the 3D laser scanner by finding separately camera lens distortions [2], [3] and the laser light plane parameters using the known distances of an object from the camera. Several laser line sub-pixel detection methods [8], [9] exist, but how much do they affect the real measurement results compared to pixel resolution methods in the calibration process and where is the trade-off between the complexity of the laser line detection algorithm and the laser scanner calibration and the measurement accuracy?
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