Calibration technology for multiple structured light projected three-dimensional profile measuring heads
A technology of structured light projection and surface measurement, applied in the field of optical measurement, can solve the problem of inability to meet the calibration requirements of multiple structured light projection three-dimensional profile measurement heads, and achieve the effects of reducing measurement time, improving measurement accuracy, and avoiding error accumulation.
Inactive Publication Date: 2012-02-29
SOUTHWEAT UNIV OF SCI & TECH
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However, the present invention requires multiple measuring heads spread around the field of view to measure different parts of the object respectively. Therefore, the common areas that the cameras can see are few, and the calibration objects in the commonly used multi-camera calibration algorithm cannot meet the requirements of multiple structured light in the present invention. Calibration requirements for projection three-dimensional surface measuring head
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[0016] Calibrator and scene design
[0017] Aiming at the calibration of different numbers of optical measuring heads, the present invention respectively designs a plurality of polyhedrons with different numbers of calibration planes. For example, the calibration of two measuring heads, three measuring heads and four measuring heads can be designed to have at least two flat plate calibration objects, three plane triangular cylinder calibration objects and four plane cuboid calibration objects, such as figure 1 shown. The size of the calibration object depends on the size of the measurement field of view.
[0018] like figure 1 In the measurement scenes shown, the measuring heads are evenly distributed around the three-dimensional calibration object, and the orientation of each optical measuring head must be directly opposite to each calibration plane of the calibration object. Each calibration plane can also be designed as a calibration object at a certain angle to the...
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The invention relates to a calibration technology for multiple structured light projected three-dimensional profile measuring heads, discloses a technology for calibrating multiple structured light projected three-dimensional profile measuring heads in different directions, which can be used for the quick label-free measurement of an object profile projected by structured light, and belongs to the technical field of optical measurement. In the calibration technology, only a calibration object of a plane with a plurality of calibration patterns is required to be designed and is not required to be manufactured into a high-precision three-dimensional target with known geometrical relationships on all surfaces; and geometrical parameters among all planes of the calibration object can be obtained by a close-range photogrammetry technology to upgrade the calibration object into the three-dimensional target, so the difficulty of machining and maintaining the high-precision three-dimensional target directly is reduced. By utilizing the technology, multiple structured light projected three-dimensional profile measuring heads can be measured from different visual angles in a label-free mode, and point clouds scanned in different directions are unified to one coordinate system automatically, so error accumulation caused by splicing is avoided effectively, and the time of the three-dimensional appearance reconstruction of the object can be shortened.
Description
Technical field [0001] The present invention involves a calibration method of an object -type facial optical measurement system. A number of calibration methods based on structural light and double -eyed vision can be used for fast bidded stickers that can be used for structural light projection.The field of optical measurement technology. Background technique [0002] The system hardware of the three -dimensional facial measuring header of this patent structure of light projection includes visual sensors, triangles, PCs and data cables.The visual sensor is composed of two cameras, one digital projector, and the two cameras are fixed on the horizontal bracket at a certain angle, and the projector is placed between the two cameras.Two CCD camera institutions form a three -dimensional stereo visual system, and the projector projects the coding structure light. The purpose is to increase the feature information in order to add feature information in order to match the matching.The e...
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IPC IPC(8): G01B11/245
Inventor 刘桂华
Owner SOUTHWEAT UNIV OF SCI & TECH
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