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High Precision Laser Scanning of Metallic Surfaces
Joint Authors
Amir, Yousaf Muhamad
Thörnberg, Benny
Source
International Journal of Optics
Issue
Vol. 2017, Issue 2017 (31 Dec. 2017), pp.1-13, 13 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2017-07-06
Country of Publication
Egypt
No. of Pages
13
Main Subjects
Abstract EN
Speckle noise, dynamic range of light intensity, and spurious reflections are major challenges when laser scanners are used for 3D surface acquisition.
In this work, a series of image processing operations, that is, Spatial Compound Imaging, High Dynamic Range Extension, Gray Level Transformation, and Most Similar Nearest Neighbor are proposed to overcome the challenges coming from the target surface.
A prototype scanner for metallic surfaces is designed to explore combinations of these image processing operations.
The main goal is to find the combination of operations that will lead to the highest possible robustness and measurement precision at the lowest possible computational load.
Inspection of metallic tools where the surface of its edge must be measured at micrometer precision is our test case.
Precision of heights measured without using the proposed image processing is firstly analyzed to be ±7.6 μm at 68% confidence level.
The best achieved height precision was ±4.2 μm.
This improvement comes at 24 times longer processing time and five times longer scanning time.
Dynamic range extension of the image capture improves robustness since the numbers of saturated or underexposed pixels are substantially reduced.
Using a high dynamic range (HDR) camera offers a compromise between processing time, robustness, and precision.
American Psychological Association (APA)
Amir, Yousaf Muhamad& Thörnberg, Benny. 2017. High Precision Laser Scanning of Metallic Surfaces. International Journal of Optics،Vol. 2017, no. 2017, pp.1-13.
https://search.emarefa.net/detail/BIM-1167913
Modern Language Association (MLA)
Amir, Yousaf Muhamad& Thörnberg, Benny. High Precision Laser Scanning of Metallic Surfaces. International Journal of Optics No. 2017 (2017), pp.1-13.
https://search.emarefa.net/detail/BIM-1167913
American Medical Association (AMA)
Amir, Yousaf Muhamad& Thörnberg, Benny. High Precision Laser Scanning of Metallic Surfaces. International Journal of Optics. 2017. Vol. 2017, no. 2017, pp.1-13.
https://search.emarefa.net/detail/BIM-1167913
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1167913