<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Three-dimensional profilometry tends to be less effective at measuring discontinuous surfaces. To overcome this problem, an optimized profilometry based on fringe projection is proposed in this paper. Due to the limitation of the shooting angle, there are projection blind spots on the surface of discontinuous objects. Since the noises and unwrapping errors are always localized at the projection blind spots, an algorithm is designed to determine the blind spots automatically with the light intensity difference information. Besides, in order to improve the measurement accuracy, a processing scheme is introduced to deal with the local height distortion introduced by the dual-frequency grating profilometry. Lots of measurement tests on various surfaces are carried out to assess the optimized profilometry, and experimental results indicate that the modified profilometry system works more robust with high reliability and accuracy in measuring different kinds of surfaces, especially discontinuous ones.</p>
</abstract>

Three-dimensional profilometry tends to be less effective at measuring discontinuous surfaces. To overcome this problem, an optimized profilometry based on fringe projection is proposed in this paper. Due to the limitation of the shooting angle, there are projection blind spots on the surface of discontinuous objects. Since the noises and unwrapping errors are always localized at the projection blind spots, an algorithm is designed to determine the blind spots automatically with the light intensity difference information. Besides, in order to improve the measurement accuracy, a processing scheme is introduced to deal with the local height distortion introduced by the dual-frequency grating profilometry. Lots of measurement tests on various surfaces are carried out to assess the optimized profilometry, and experimental results indicate that the modified profilometry system works more robust with high reliability and accuracy in measuring different kinds of surfaces, especially discontinuous ones.

3D Measurement of Discontinuous Objects with Optimized Dual-frequency Grating Profilometry

Measurement Science Review

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Three-dimensional profilometry tends to be less effective at measuring discontinuous surfaces. To overcome this problem, an optimized profilometry based on...

3D Measurement of Discontinuous Objects with Optimized Dual-frequency Grating Profilometry

Published Online: Oct 26, 2021

Page range: 197 - 204

Received: Jul 11, 2021

Accepted: Oct 18, 2021

DOI: https://doi.org/10.2478/msr-2021-0027

Keywords
Three-dimensional profilometry, automatic determination of blind spots, measurement of discontinuous surfaces, local height distortion correction

© 2021 Jun Che et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

3D Measurement of Discontinuous Objects with Optimized Dual-frequency Grating Profilometry

Published Online: Oct 26, 2021

Page range: 197 - 204

Received: Jul 11, 2021

Accepted: Oct 18, 2021

DOI: https://doi.org/10.2478/msr-2021-0027

KeywordsThree-dimensional profilometry, automatic determination of blind spots, measurement of discontinuous surfaces, local height distortion correction

© 2021 Jun Che et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Three-dimensional profilometry, automatic determination of blind spots, measurement of discontinuous surfaces, local height distortion correction