Calibration of line-scan cameras for precision measurement

Sun, Bo; Zhu, Jigui; Yang, Linghui; Yang, Shu; Niu, Zhiyuan

doi:10.1364/ao.55.006836

Cited by 28 publications

(17 citation statements)

References 11 publications

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“…3D calibration objects are used by Luna et al (2010), Lilienblum et al (2013), Niu et al (2018) and Song et al (2018). Finally, Sun et al (2016b) use an additional area-scan camera to calibrate the line-scan camera, which is undesirable since it increases the cost of the camera setup.…”

Section: Related Workmentioning

confidence: 99%

A Camera Model for Line-Scan Cameras with Telecentric Lenses

Steger

Ulrich

2020

Int J Comput Vis

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We propose a camera model for line-scan cameras with telecentric lenses. The camera model assumes a linear relative motion with constant velocity between the camera and the object. It allows to model lens distortions, while supporting arbitrary positions of the line sensor with respect to the optical axis. We comprehensively examine the degeneracies of the camera model and propose methods to handle them. Furthermore, we examine the relation of the proposed camera model to affine cameras. In addition, we propose an algorithm to calibrate telecentric line-scan cameras using a planar calibration object. We perform an extensive evaluation of the proposed camera model that establishes the validity and accuracy of the proposed model. We also show that even for lenses with very small lens distortions, the distortions are statistically highly significant. Therefore, they cannot be omitted in real-world applications.

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Section: Related Workmentioning

confidence: 99%

A Camera Model for Line-Scan Cameras with Telecentric Lenses

Steger

Ulrich

2020

Int J Comput Vis

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“…As shown in Figure 10, an auxiliary matrix camera is used to aid the calibration. Detailed information about the calibration method is described in [15]. …”

Section: Resultsmentioning

confidence: 99%

Sensor for In-Motion Continuous 3D Shape Measurement Based on Dual Line-Scan Cameras

Sun

Zhu

Yang

et al. 2016

Sensors

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The acquisition of three-dimensional surface data plays an increasingly important role in the industrial sector. Numerous 3D shape measurement techniques have been developed. However, there are still limitations and challenges in fast measurement of large-scale objects or high-speed moving objects. The innovative line scan technology opens up new potentialities owing to the ultra-high resolution and line rate. To this end, a sensor for in-motion continuous 3D shape measurement based on dual line-scan cameras is presented. In this paper, the principle and structure of the sensor are investigated. The image matching strategy is addressed and the matching error is analyzed. The sensor has been verified by experiments and high-quality results are obtained.

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“…Before the measurement of the vision system for the flange-end holes, it is necessary to calibrate each sub-camera in the visual measurement device. The calibration processes are: 1. the calibration of the intrinsic parameters of subcamera; 2. global calibration for fusion progress of each pixel coordinate system to the flange-end surface coordinate system (this is also the process for calculating the extrinsic parameters of each sub-camera) [14].…”

Section: B the Measurement Of The Flange-end Holesmentioning

confidence: 99%

The Fast Measurement for the Relative Position of Flange-End Holes

Wang

Sun

2019

IEEE Access

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For the flange end of the internal combustion engine crankshaft, the position of threaded holes and pinhole relative to the journal reference plane affects the dynamic balance and thermal efficiency of the engine, and therefore, this parameter measurement has a positive significance in the crankshaft manufacture. This paper proposes a system for quickly measuring the relative position of the flange-end holes, which uses a pneumatic linear variable differential transformer to form measuring benches for getting the position of the journal reference plane, and the high precision coordinates of the flange-end holes are obtained by multicamera. The coordinates of the flange-end holes are merged into the global coordinate system of the journal reference plane, and the experimental result shows that the position uncertainty is better than 0.1 mm. This method has the advantage of convenient loading and unloading, fast measuring speed, and high accuracy and is easily implemented in the flexible manufacturing line for a full inspection of the semi-finished crankshaft. INDEX TERMS Crankshaft, flange-end holes, pLVDT, multi-camera.

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Calibration of line-scan cameras for precision measurement

Cited by 28 publications

References 11 publications

A Camera Model for Line-Scan Cameras with Telecentric Lenses

A Camera Model for Line-Scan Cameras with Telecentric Lenses

Sensor for In-Motion Continuous 3D Shape Measurement Based on Dual Line-Scan Cameras

The Fast Measurement for the Relative Position of Flange-End Holes

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