基于傅里叶变换轮廓术的高速齿科三维扫描仪实现

Implementation of high-speed dental 3D scanner using Fourier transform profilometry

齿科三维扫描仪是数字化齿科修复的重要组成部分,在种植、正畸、嵌体等齿科修复中发挥着数据获取的关键作用。为了实现三维口腔模型的高速采集,提出了一种基于傅里叶变换轮廓测量法的三维重建算法的牙科三维扫描系统。投射光栅图形到牙齿印模上,采集变形光栅图像,对相机捕获的变形条纹图像信息进行预处理,相位解包裹、三维点云重构和获取三维模型,实现了傅里叶变换轮廓术的高速齿科三维扫描仪。经测试,该扫描仪可在9秒内完成牙齿印模扫描,能达到10微米内的扫描精度,性能表现突出。

A dental 3D scanner is an important device in digital dentistry and plays a key role in obtaining model data in various dental restoration cases such as implants,orthodontics,inlays,onlays,and veneers.To realize high-speed acquisition of 3D oral model,a dental 3D scanning system with the 3D reconstruction algorithm based on Fourier transform profilometry is proposed.It first projects a single image with fringes onto tooth models and simultaneously captures the image with the deformed fringes;then it preprocesses the image for a more precise phase unwrap;after that it reconstructs the 3D point cloud according to the phase information and finally generates the 3D model,so as to realize the high speed 3D scanning system.Experiment results indicate that the system has outstanding performance with being not only able to complete a single jaw model scanning within 9 seconds,but also achieve a scanning accuracy of less than 10 microns.