Spot Array Optimization of Parallel Confocal Imaging Based on Digital Micromirror Device

Qian, 朱茜 Zhu; Xibin, 杨西斌 Yang; Simin, 李思黾 Li; Hui, 李辉 Li; Chi, 王驰 Wang; Shoupeng, 刘首鹏 Liu; Jian, Junming; Daxi, 熊大曦 Xiong

doi:10.3788/aos201838.0118001

Cited by 3 publications

(1 citation statement)

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“…7 Active methods involve emitting an optical signal to interact with the object, while passive methods do not require such light emission. Noncontact optical techniques in orthodontics can further be classified into optical triangulation (OT), 8 parallel confocal (PC), 9 fringe projection profilometry (FPP), 10 and photogrammetry computer vision (PCV). 11 The OT system comprises a laser-based light source, a high-power lens, and an exceptionally sensitive sensor plate.…”

Section: Introductionmentioning

confidence: 99%

Position and posture measurement of stereo probes for dental implants with a four-camera vision system

Li,

Zhang

2024

Opt. Eng.

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.The fixed denture supported by multiple implants can effectively improve the retention and stability of traditional complete dentures, and greatly improve the masticatory ability and life quality of patients, which has been proven to be a reliable treatment method. However, how to accurately obtain the position and posture of multiple implants while the patient feels comfortable is still one of the main clinical difficulties. We design a four-camera system and propose its corresponding method, which accurately measures the position and posture of stereo probes (note that the stereo probes are finely screwed on the implants, i.e., the coordinate systems of the implants are transferred to the stereo probes). In the calibration, a ChArUco calibration board is introduced and the calibration parameters are derived utilizing the proposed three-stage calibration strategy. In the measurement, the stereo probes are screwed on the implants and captured by the four-camera system. Through Canny/Devernay method, the gauge points on the surface of the stereo probe can be solved. Subsequently, the decoding of the gauge points and stereo probes is achieved by the implementation of the proposed matching and decoding strategy. In addition, to achieve higher accuracy, a refinement approach under multiview for the position and posture of stereo probes is established. The result of the experiments verifies that our system and method have higher accuracy and effectiveness (note that the distance error between the two stereo probes is about 19 μm), which is entirely satisfactory for the application of digital implant impressions.

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Section: Introductionmentioning

confidence: 99%

Position and posture measurement of stereo probes for dental implants with a four-camera vision system

Li,

Zhang

2024

Opt. Eng.

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Smooth Surface Visual Imaging Method for Eliminating High Reflection Disturbance

Shao

Liu

Shao

et al. 2019

Sensors

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At present, visual imaging is widely applied for surface defects such as bumps and scratches in the manufacture of precise parts with a highly reflective surface. However, the high light reflection and halo disturbance as a result of the illumination in visual imaging exert a direct influence on the accuracy of defect detection. In this regard, the present paper develops an adaptive illumination method based on space–time modulation for a visual imaging system. Furthermore, a digital micro-mirror device (DMD) is employed to realize the pixel-level spatiotemporal modulation of illumination. Then, in combination with the illumination intensity feedback of charge coupled device (CCD), the time-space ratio is adjusted automatically to achieve adaptive uniform illumination and effectively suppress the high light reflection and halo disturbance of highly reflective surfaces. The experimental results show that, in terms of restraining high light disturbance, the visibility and accuracy of visual imaging are improved.

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三维表面形貌测量中的共聚焦显微成像技术研究进展

Wang Yueying,

Liu Xu,

Hao Xiang

2023

激光与光电子学进展

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Spot Array Optimization of Parallel Confocal Imaging Based on Digital Micromirror Device

Cited by 3 publications

References 0 publications

Position and posture measurement of stereo probes for dental implants with a four-camera vision system

Position and posture measurement of stereo probes for dental implants with a four-camera vision system

Smooth Surface Visual Imaging Method for Eliminating High Reflection Disturbance

三维表面形貌测量中的共聚焦显微成像技术研究进展

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