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Three-dimensional shape measurement for the steep surface using DMD camera.

Shoubo Zhao^1,2, Yuqiang Yang³

¹School of Mechanical Engineering, Guangdong Ocean University, Zhanjiang, 524088, China. shoubozh@126.com.

Scientific Reports

|December 6, 2022

Summary

This summary is machine-generated.

This study introduces a novel 3D shape measurement technique using compressed sensing in a Digital Micromirror Device (DMD) camera to accurately reconstruct steep surfaces. The method enhances spatial sampling and noise robustness for precise 3D modeling.

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Area of Science:

Optics and Photonics
Computer Vision
Metrology

Background:

Three-dimensional (3D) shape measurement techniques struggle with accuracy on steep surfaces due to phase ambiguity.
Existing methods often fail to capture intricate details on surfaces with high slopes.

Purpose of the Study:

To develop an accurate 3D shape measurement method for steep surfaces.
To overcome the limitations of traditional phase shifting techniques in challenging geometries.

Main Methods:

Utilizing compressed sensing theory to reconstruct phase-shifting images captured by a Digital Micromirror Device (DMD) camera.
Aligning Charge-Coupled Device (CCD) pixels with DMD mirrors to form a DMD camera system.
Employing one-dimensional measurement matrices based on gradient information for data acquisition.
Reconstructing sinusoidal stripe images to derive 3D surface models.

Main Results:

The proposed method accurately reconstructs 3D models of steep surfaces.
Enhanced spatial sampling frequency and improved noise robustness were achieved.
Demonstrated capability to measure planes with various slopes effectively.
Comparative experiments confirmed the method's ability to correct phase deformation and repair surface defects.

Conclusions:

Compressed sensing applied to DMD camera systems offers a robust solution for 3D shape measurement of steep surfaces.
The technique provides accurate phase correction and defect repair, improving overall measurement fidelity.
This approach advances the field of 3D metrology for complex and challenging geometries.