Structural parameter calibration and affine coordinate system construction method and system for visual measurement system

Abstract

The present invention relates to the technical field of digital photogrammetry, and provides a method and system for calibrating structural parameters of a visual measurement system and constructing an affine coordinate system. The method includes: S1, performing beam adjustment on the same photo with front points and corresponding image points Obtain the coordinates of the rear intersection point; S2, obtain the coordinates of the front principal point corresponding to the intersection point; S3, use multiple different labeled images to repeat S1 and S2 to obtain multiple sets of point pairs; S4, use the intersection point and the corresponding point of the front projection to perform tangent alignment Spherical secondary intersection adjustment, to obtain the structural parameters of the visual measurement system and the coordinates of the center of rotation of the pan / tilt; S5, to establish an affine space coordinate system. The present invention adopts the calibration method of the second rendezvous iteration of the common sphere, which can accurately calibrate the structural parameters of the visual measurement system (that is, the cloud mirror camera system, the same hand-eye system), establish an accurate affine coordinate system, and realize the structural parameters based on the visual measurement system itself. Standardless accurate measurement.

Description

technical field [0001] The invention relates to the technical field of digital photogrammetry, and more specifically, to a method and system for calibrating structural parameters of a visual measurement system and constructing an affine coordinate system. Background technique [0002] The rapid development of modern system integration technology and agricultural information acquisition technology in the field of precision agriculture has enabled agriculture and other social industries to put forward higher requirements for related phenotypic measurement, operational mechanical measurement, geometric measurement and structural testing, such as High-throughput, non-standard, non-contact, cheap, high-precision and networked, etc. [0003] Because the visual measurement system can meet the above requirements to a certain extent, digital photogrammetry combined with digital image analysis method has been widely used in 3D measurement. Among them, the two-axis turntable-lens-came...

AI Technical Summary

Problems solved by technology

However, the unsatisfactory correction of control points, structured light and laser-assisted methods will lead to the inability to accurately calibrate the affine relationship of the hand-eye coordinate system, affecting the accuracy of visual measurement

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