Calibration method for large-field-of-view stereo vision system based on distance-related distortion model

Article Optics

A flexible calibration method based on small planar target for defocused cameras

Junzhou Huo et al.

Summary: This paper proposes a flexible calibration method for defocused cameras in complex engineering scenes. The method achieves high calibration accuracy by solving the distortion coefficient and establishing an image distance conversion model through linear camera calibration based on image pairs. Experimental results show that the method is effective and has satisfactory calibration accuracy and good anti-noise performance.

OPTICS AND LASERS IN ENGINEERING (2022)

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Article Engineering, Electrical & Electronic

Command Filter-Based Adaptive Fuzzy Finite-Time Output Feedback Control of Nonlinear Electrohydraulic Servo System

Jiafeng Li et al.

Summary: In this article, a command filter-based adaptive fuzzy finite-time output feedback control method is investigated for the electrohydraulic servo system. Uncertainties in the system are estimated using fuzzy logic systems (FLSs), and a fuzzy state observer is established to approximate unmeasurable parameters. A command filter-based control method is proposed to achieve high tracking precision. Simulation results demonstrate the effectiveness of the proposed control.

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT (2022)

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Article Engineering, Electrical & Electronic

A Two-Step Calibration Method for Vision Measurement With Large Field of View

Hao Hu et al.

Summary: This paper proposes a two-step calibration method for the interior and exterior parameters of multicameras based on the principle of industrial close-range photogrammetry. The feasibility and accuracy of this method have been verified through experiments.

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT (2022)

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Article Optics

Analytical solution of uncertainty with the GUM method for a dynamic stereo vision measurement system

Xiaoyun Chen et al.

Summary: A novel dynamic stereo vision measurement system based on the quaternion theory is proposed in this paper to reduce orthogonality restrictions and provide complete uncertainty results. By analyzing the relationship among attitude angles, the major factors influencing uncertainties in each axis are identified, and the uncertainty variation tendency is illustrated. The analytical solution of uncertainty with the GUM method offers a new idea for uncertainty analysis in complex combined measurement systems.

OPTICS EXPRESS (2021)

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Article Optics

Spatial light path analysis and calibration of four-mirror-based monocular stereo vision

Xiao Li et al.

Summary: The feasibility and accuracy of tour-mirror-based monocular stereo vision (FMSV) are related to the system layout and calibration accuracy. In this study, a spatial light path analysis method and calibration method are proposed to refine the system design and improve accuracy. A DoF-distortion equal-partition-based model is established to propose an accurate and practical FMSV calibration method without constraint. The proposed vision system achieves high accuracy with an average error of 0.031 mm.

OPTICS EXPRESS (2021)

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Article Optics