Essential parameter calibration for the 3D scanner with only single camera and projector

Song, Limei; Chen, Chang-man; Chen, Zhuo; Xi, Jiangtao; Yu, Yanguang

doi:10.1007/s11801-013-2395-x

Cited by 12 publications

(5 citation statements)

References 16 publications

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“…In order to improve the accuracy of phase, we applies the Three Wavelength Phase Shift Profilometry (TWPSP) to calculate the global absolute phase values in coded stripe patterns based on previous research [18,20]. The phase-shift method recovers the phase principal values containing the three-dimensional information of the measured object through multiple phase-shift images [21].…”

Section: Phase Unwrapping Methodsmentioning

confidence: 99%

Method of generating roughening paths for shoe soles based on monocular encoded structured light

et al. 2023

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In this paper, we propose a monocular encoded structured light-based path generation method for sole roughening, and the obtained paths are used to guide a six-degree-of-freedom (DOF) robot for automatic roughening, which greatly improves the quality and efficiency of roughening. First, we selected monocular structured light as the vision system. To improve the calibration and reconstruction accuracy of the projector, we used an improved Three-Wavelength Phase-Shift Profilometry technique (TWPSP) to calibrate the projector, and the accuracy was improved by 26.29% compared with the conventional method. Then, we proposed a Three Coordinate Scanning Weighted-Principal Component Analysis (TCSW-PCA) algorithm as the path planning system. The experimental results show that the six-DOF-robot can automatically roughen different types of soles according to the generated roughening paths, and the processing efficiency and finished product quality of our proposed method of automatic roughening are better than other roughening methods, with an average improvement of 42% in roughening effect and an average improvement of 30.52% in roughness.

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Section: Phase Unwrapping Methodsmentioning

confidence: 99%

Method of generating roughening paths for shoe soles based on monocular encoded structured light

et al. 2023

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“…Finally, the frequency 0 f of projected fringe patterns on reference plane can be calculated using the method in [12].…”

Section: Calibration Of Camera and Projectormentioning

confidence: 99%

“…Over the past decades, a number of approaches for system calibration are proposed, e.g., [5][6][7][8][9][10][11]. Recently in 2013, a method to calibrate five essential parameters associated with the camera and the projector is presented by Song, et al [12] . However, all the existing work reported in literature was based on the FPP structure meeting the three conditions.…”

Section: Introductionmentioning

confidence: 99%

Improved geometrical model of fringe projection profilometry

Huang¹,

Xi²,

Yu³

et al. 2014

Opt. Express

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The accuracy performance of fringe projection profilometry (FPP) depends on accurate phase-to-height (PTH) mapping and system calibration. The existing PTH mapping is derived based on the condition that the plane formed by axes of camera and projector is perpendicular to the reference plane, and measurement error occurs when the condition is not met. In this paper, a new geometric model for FPP is presented to lift the condition, resulting in a new PTH mapping relationship. The new model involves seven parameters, and a new system calibration method is proposed to determine their values. Experiments are conducted to verify the performance of the proposed technique, showing a noticeable improvement in the accuracy of 3D shape measurement. Disciplines Engineering | Science and Technology Studies

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“…Considering the geometric artifacts of the projection data reconstruction owing to the deflection error of the detector during the CT scanning process, either the offline calibration method or the self-calibration method [6] are employed to solve the geometric parameters, depending on whether a calibration object is required. The offline calibration method solves the geometric parameters based on the correspondence between the coordinates of markers in standard modules and their projected coordinates.…”

Section: Introductionmentioning

confidence: 99%

A Novel Geometric Parameter Self-Calibration Method for Portable CBCT Systems

Zhang

Yang

et al. 2023

Electronics

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In outdoor environments or environments with space restrictions, it is difficult to transport and use conventional computed tomography (CT) systems. Therefore, there is an urgent need for rapid reconstruction of portable cone-beam CT (CBCT) systems. However, owing to its portability and the characteristics of temporary construction environments, high precision spatial location is difficult to achieve with portable CBCT systems. To overcome these limitations, we propose an iterative self-calibration improvement method with a self-calculated initial value based on the projection relationship and image features. The CT value of an open field image was used as the weight value of the projection data in the subsequent experiments to reduce the nonlinear attenuation of the projection intensity. Subsequently, an initial value was obtained based on the invariance of the rotation axis. Finally, self-calibration was realized iteratively using the reconstructed image. This method overcomes the main problem of the rotation axis invariance calibration algorithm—high similarity between the adjacent positions of symmetrical homogeneous materials. The proposed method not only improves the precision of self-calibration based on the projection relationship, but also reduces the performance cost and solution time of the self-calibration algorithm based on the image features. Thus, it satisfies the precision requirements for self-calibration of portable CBCT systems.

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Essential parameter calibration for the 3D scanner with only single camera and projector

Cited by 12 publications

References 16 publications

Method of generating roughening paths for shoe soles based on monocular encoded structured light

Method of generating roughening paths for shoe soles based on monocular encoded structured light

Improved geometrical model of fringe projection profilometry

A Novel Geometric Parameter Self-Calibration Method for Portable CBCT Systems

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