Non-orthogonal depth from focus for on-the-fly, three-dimensional inspection

Evan Ribnick

doi:10.1117/1.OE.51.8.083608

16 August 2012 Non-orthogonal depth from focus for on-the-fly, three-dimensional inspection

Evan Ribnick

Author Affiliations +

Optical Engineering, Vol. 51, Issue 8, 083608 (August 2012). https://doi.org/10.1117/1.OE.51.8.083608

Abstract

This paper describes a new technique that was developed for performing three-dimensional (3-D) reconstruction on-the-fly for inspection applications. It is based on the same principles as the traditional depth from focus approach but is able to estimate the three-dimensional structure of a surface as it is undergoing a continuous linear lateral translation, similar to the situation on many types of modern production lines. This has important applications in the area of automated inspection and quality control, since the ability to inspect materials in real-time as they are being manufactured in a continuous process is valuable in a broad range of circumstances. We assume that the relative motion of the surface is known, which is realistic in these types of environments. We demonstrate the technical feasibility of our approach, including its ability to acquire 3-D shape on several different types of structured surfaces.

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Evan Ribnick "Non-orthogonal depth from focus for on-the-fly, three-dimensional inspection," Optical Engineering 51(8), 083608 (16 August 2012). https://doi.org/10.1117/1.OE.51.8.083608

Published: 16 August 2012

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KEYWORDS

Inspection

Cameras

Imaging systems

3D image processing

Sensors

Manufacturing

Calibration

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