Field Geometric Calibration Method for Line Structured Light Sensor Using Single Circular Target

Chen, Tianfei; Sun, Lixin; Zhang, Qiuwen; Wu, Xiang; Wu, Defeng

doi:10.1155/2017/1526706

Cited by 6 publications

(5 citation statements)

References 17 publications

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“…The reason for this result was that the error points involved in the calculation also increased with the increase in the number of parallel constraints. In recent research, the methods proposed in references [19,20] are similar to the methods in this paper. The calibration accuracy obtained by reference [19] was 0.0451 mm, which was lower than the calibration accuracy of this paper (the measurement accuracy of the gauge block was 0.024 mm when using four parallel planes in the paper).…”

Section: Evaluation Experiments Of Calibration Methods With Multiple ...mentioning

confidence: 86%

“…This method is affordable and can be performed using a single camera and a freely movable cross-line laser projector. Chen [19] used a single circle as the calibration body for the calibration plane. This method could solve the camera parameters, distortion coefficients, and parameters of the light plane equation in a single unit, significantly reducing the calibration cost of the line-structured light system and simplifying the calibration process.…”

Section: Introductionmentioning

confidence: 99%

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Research on Calibration Method of Line-Structured Light Based on Multiple Geometric Constraints

Ren

et al. 2023

Applied Sciences

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Line-structured light calibration is an important step in the process of the visual measurement of structured light, and in the calibration process, the light plane equation is fitted by the camera coordinates of the data points on the light plane. There is error in solving the spatial coordinates of the data points, and the existing methods generally cannot effectively find the deviation points in the fitted data points, which leads to deviation when solving the parameters of the light plane equation. To correct the error caused by the deviation point in the calibration, this paper established a calibration method based on geometric constraints. In the method, the first constraint was that all fit points involved in the fitting had a certain consistency, and a part of the error points could be filtered by the distance from the data point to the light plane. In order to further improve the calibration accuracy, the laser was moved on a linear guide, the optimized objective function was established by the second geometric constraint, and the constraint was the relationship that the light plane at each position was parallel. In the experiment, a high-precision gauge block was used as the measured object, and the measurement results could be obtained. The calibration method can improve the calibration accuracy according to the experimental results.

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Section: Evaluation Experiments Of Calibration Methods With Multiple ...mentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Research on Calibration Method of Line-Structured Light Based on Multiple Geometric Constraints

Ren

et al. 2023

Applied Sciences

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“…These techniques can be included in thousands of devices, even to solve big or small problems for society . In some industries, the artificial intelligence techniques based on sensor information are also used to calibrate devices automatically …”

Section: Related Workmentioning

confidence: 99%

“…5 In some industries, the artificial intelligence techniques based on sensor information are also used to calibrate devices automatically. 26,27 There is also a lot of information that can be obtained using sensors, and many of the security systems are based on cameras or laser vision. 28 Machine vision sensors are a common approach to monitor environments.…”

Section: Related Workmentioning

confidence: 99%

Real‐time force doors detection system using distributed sensors and neural networks

et al. 2019

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Intelligent security systems have evolved enormously in the last few years. Most of these security systems use a group of physics sensors and algorithms for data analysis and communication systems to notify security alarms. Many security systems that are included in doors can detect intruders when they have already opened the door, but not while intruders are forcing upon the door. However, some security systems include preventive systems, which can detect intruders before they open the door. These preventive systems are usually based on video cameras (image processing) or in‐presence sensors, which can generate many false positives, for instance, when a person is next to the door for a few seconds, even if this person is not manipulating the door. This research work proposes a novel force door detection system. The system includes a specific device for monitoring door small vibrations and movements; it analyzes these data using neural networks to detect accurately if someone is forcing upon the door. Artificial intelligence must be able to categorize data records without confusing when someone is forcing upon the door with other actions, like knocking on the door.

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“…Ha [ 10 ] established 3D–3D correspondences between the camera and laser range finder by a calibration structure that has a triangular hole on its plane. Chen et al [ 11 ] proposed a geometric calibration method for a line structured light sensor, which calibrates camera intrinsic parameters and the laser structured light plane equation by using a single circular target designed to construct geometric constraints. However, these calibration methods of the structured light plane need a specially designed target, auxiliary equipment or a relatively complex calibration model, which reduce their applicability and convenience.…”

Section: Introductionmentioning

confidence: 99%

Internal Parameters Calibration of Vision Sensor and Application of High Precision Integrated Detection in Intelligent Welding Based on Plane Fitting

Zhu

et al. 2022

Sensors

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Vision sensing is a key technology to realize on-line detection of welding groove sizes and welding torch relative position and posture parameters during the arc welding process of intelligent production. For the specially designed vision sensor based on combined laser structured lights, an integrated calibration method for its internal parameters is proposed firstly, which improves the efficiency, accuracy and comprehensiveness of internal parameter calibration for a line structured light vision sensor and provides a good foundation for industrial application of the vision sensor. Then, the high precision integrated detection algorithms are derived for the V-groove size parameters and the spatial position and posture (SPP) parameters of the welding torch relative to the welding groove based on a single modulated laser lines image. The algorithms make full use of the data in a single modulated laser lines image, adopting data segmentation and plane fitting to realize the 3D reconstruction of V-groove surfaces and its adjacent workpiece surfaces of planar workpiece, so solving the parameters with high precision. In the verification tests, the relative detection error of V-groove size parameters of planar workpiece is less than 1%, and the relative detection error of SPP parameters of welding torch relative to the welding groove is less than 5%, which separately shows the effectiveness and accuracy of the calibration method and the detection algorithms. This research work provides a good technical support for the practical application of the specially designed vision sensor in the intelligent welding production.

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Field Geometric Calibration Method for Line Structured Light Sensor Using Single Circular Target

Cited by 6 publications

References 17 publications

Research on Calibration Method of Line-Structured Light Based on Multiple Geometric Constraints

Research on Calibration Method of Line-Structured Light Based on Multiple Geometric Constraints

Real‐time force doors detection system using distributed sensors and neural networks

Internal Parameters Calibration of Vision Sensor and Application of High Precision Integrated Detection in Intelligent Welding Based on Plane Fitting

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