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A calibration curve is a plot of the instrument's response against a series of known concentrations of a substance. This curve is used to set the instrument response levels, using the substance and its concentrations as standards. Alternatively, or additionally, an equation is fitted to the calibration curve plot and subsequently used to calculate the unknown concentrations of other samples reliably.
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Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

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Method for large-range structured light system calibration.

Yatong An, Tyler Bell, Beiwen Li

|November 22, 2016

Summary

This summary is machine-generated.

This study introduces a novel large-range structured light system calibration method that eliminates the need for large, costly targets. The technique achieves high accuracy (0.07 mm) in wide fields of view, outperforming existing sensors.

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Area of Science:

Optics and Photonics
Computer Vision
Metrology

Background:

Structured light systems require calibration targets matching their field of view (FOV).
Large-FOV systems face challenges due to the difficulty and expense of fabricating large calibration targets.

Purpose of the Study:

To present a large-range structured light system calibration method that avoids the need for large calibration targets.
To develop a high-accuracy, large-scale 3D shape measurement system.

Main Methods:

Calibrate intrinsic camera and projector parameters at near range with out-of-focus imaging.
Calibrate extrinsic parameters using a low-accuracy, large-range 3D sensor (e.g., Microsoft Kinect).

Main Results:

Developed a large-scale 3D shape measurement system with a FOV of 1120 mm × 1900 mm × 1000 mm.
Achieved measurement accuracy of 0.07 mm (standard deviation 0.80 mm) for a 304.8 mm sphere.
Outperformed Kinect V2's accuracy (mean error 0.80 mm, std dev 3.41 mm) within the same FOV.

Conclusions:

The proposed method enables accurate large-range structured light system calibration without large targets.
This approach significantly enhances 3D shape measurement capabilities for large-scale applications.