1 北京理工大学 光电学院， 北京 100081
2 深圳市宝安区人民医院， 广东 深圳 518100
为解决传统牙科三维扫描仪扫描中的抖动问题，提出了一种基于相机阵列的新型牙科三维扫描仪。利用多个不同视场的相机可以直接单次照相获取目标的三维信息，避免了扫描过程中抖动带来的影响，提高系统实时性。由于牙齿尺寸较小，所以选择微透镜阵列代替大型相机阵列，在减小系统体积的同时可以更好地保证相机间光轴的平行度。实验结果显示，系统最终实现了单颗牙齿的视差和深度计算。系统结构简单，便于小型化和低成本口内牙齿三维测量设备的研制，进一步推进医学数据的数字化进程。
牙科扫描仪 相机阵列 立体视觉 dental scanner camera array stereo vision
Author Affiliations
Abstract
1 School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
2 University of Chinese Academy of Sciences, Beijing 100853, China
3 Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
This Letter proposes a snapshot imaging spectrometer, which obtains the spectral information and spatial information in one “shot”. The device proposed can achieve the data cube size of 21×29×40 in the waveband of 400–800 nm. The core element of this system is the microlens array, which contains 60×60 microlenses in a square arrangement, each microlens has an aperture of 125 μm×125 μm, and the F number is 15. The microlens array is mounted in a rotation mount, which provides 360° of rotation around the optical axis to maximize the spectral resolution. The final resolution of the system is about 10 nm.
110.4234 Multispectral and hyperspectral imaging 120.4640 Optical instruments 300.6190 Spectrometers Chinese Optics Letters
2019, 17(1): 011101
