Reflected Spot Center Offset Correction in Laser Triangulation Measurement

Xingmin, 周兴敏 Zhou; Hengbiao, 刘恒彪 Liu; Jianmin, 葛剑敏 Ge

doi:10.3788/aos201535.0512001

Cited by 1 publication

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“…Yet, when the two monocular systems are set asymmetrically, the fused result may not be satisfactory. To deal with the laser point grayscale mutation, Zhou et al [7] used a double-triangular optical path to correct the deviation of the projection beam axis and the centroid deviation of the reflected light spot, but this is not suitable for stripes.…”

Section: Introductionmentioning

confidence: 99%

A multi-system weighted fusion method to improve measurement accuracy of structured light 3D profilometry

Xing

Wang

Gao

2022

Meas. Sci. Technol.

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It is a challenge to improve the accuracy of 3D profile measurement based on binary coded structured light for complex surfaces. A new method of weighted fusion with multi-system is presented to reduce the measurement errors due to the stripe grayscale asymmetry, which is based on the analysis of stripe center deviation related to surface normal and the directions of incident and reflected rays. First, the stripe center deviation model is established according to the geometric relationship between the stripe center deviation, the incident and reflected angles at any measured point. The influence of each variable on stripe center deviation is analyzed, and three subsystems are formed by a binocular structured light framework to achieve multiple measurements based on the influence regularity. Then in order to improve the measurement accuracy, different weights are assigned to the measured point in different subsystems according to the stripe center deviation model and its relationship with measurement error, and the weighted data from different subsystems are fused. Experiments are carried out to validate the presented method, and the experimental results demonstrate that it effectively improves the measurement accuracy of complex surfaces and measurement accuracy is improved by about 27% compared with the conventional method.

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Section: Introductionmentioning

confidence: 99%