Research on calibration system of laser marker based on machine vision

Liu, H.; Cui, Y.; Zhou, H.; Wang, W.; Huang, Chun Yuan; Zheng, Y.

doi:10.1049/icp.2022.3188

Cited by 1 publication

(2 citation statements)

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“…Taking equal focal power as the conversion condition, the input current I at a certain temperature T can be converted to the equivalent current I ′ at the reference temperature T 0 . The following functional relationship exists [16]:…”

Section: Temperature Drift and Compensationmentioning

confidence: 99%

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Research on Monocular Depth Sensing Method Based on Liquid Zoom Imaging

Gan,

Liu,

Liu

et al. 2024

Photonics

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Monocular stereo vision has excellent application prospects in the field of microrobots. On the basis of the geometric model of bifocal imaging, this paper proposes a monocular depth perception method by liquid zoom imaging. Firstly, the configuration of a monocular liquid vision system for depth measurement is presented, and the working mechanism of the system is analyzed through theoretical derivation. Then, to eliminate the influence of optical axis drift induced by the liquid gravity factor on the measurement results, the target image area is used as the calculation feature instead of the image vector length. A target area calculation method based on chain code classification and strip segmentation is proposed. Furthermore, in response to the fluctuation problem of liquid lens focal power caused by factors such as temperature and object distance, a dynamic focal length model of the liquid zoom imaging system is constructed after precise calibration of the focal power function. Finally, a testing experiment is designed to validate the proposed method. The experimental results show that the average error of depth perception methods is 4.30%, and its measurement time is only on the millisecond scale. Meanwhile, the proposed method has good generalization performance.

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Section: Temperature Drift and Compensationmentioning

confidence: 99%

“…For an electromagnetic-driven liquid lens, its focal power is in direct proportion to the current [16]. Considering the influence of temperature on focal power, combined with Equation ( 5), the function relationship between focal power and input current I at a certain temperature T is obtained as follows:…”

Section: Temperature Drift and Compensationmentioning

confidence: 99%