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Appl. Sci. 2019, 9(3), 591; https://doi.org/10.3390/app9030591

Three-Dimensional Reconstruction Method for Machined Surface Topography Based on Gray Gradient Constraints

School of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an 710048, China
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Received: 17 January 2019 / Revised: 1 February 2019 / Accepted: 2 February 2019 / Published: 11 February 2019
(This article belongs to the Section Mechanical Engineering)
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Abstract

In the modern engineering field, recovering the machined surface topography is important for studying mechanical product function and surface characteristics by using the shape from shading (SFS)-based reconstruction method. However, due to the limitations of many constraints and oversmoothing, the existing SFS-based reconstruction methods are not suitable for machined surface topography. This paper presents a new three-dimensional (3D) reconstruction method of machined surface topography. By combining the basic principle of SFS and the analytic method, the analytic model of a surface gradient is established using the gray gradient as a constraint condition. By efficiently solving the effect of quantization errors and ambiguity of the gray scale on reconstruction accuracy using a wavelet denoising algorithm and image processing technology, the reconstruction algorithm is implemented for machined surface topography. Experimental results on synthetic images and machined surface topography images show that the proposed algorithm can accurately and efficiently recover the 3D shape of machined surface topography. View Full-Text
Keywords: shape from shading; surface gradient; gray gradient; analytic reconstruction; machined surface topography shape from shading; surface gradient; gray gradient; analytic reconstruction; machined surface topography
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Shi, W.-C.; Zheng, J.-M.; Li, Y.; Li, X.-B. Three-Dimensional Reconstruction Method for Machined Surface Topography Based on Gray Gradient Constraints. Appl. Sci. 2019, 9, 591.

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