3-Dimensional Measurement Technique using a Maxillo-facial Morphology

非接触、高精度的三维轮廓测量在机械工程、骨科、整形外科和人体工程等领域都有着广泛的应用前景，如何快速获得所有的三维数据，并将这些数据转换成三维坐标是三维轮廓测量的关键，本文研究了三维轮廓测量的方法，并对三维轮廓测量中的一些关键技术进行了研究。我们示出了一种能够快速三维测量人类上颌骨-面部形态的技术。如前所述，头部轮廓是骨科和抽动外科的重要关注点之一。我们的测量系统的原理是基于有线模式投影法。该系统的特点之一是采用图像处理器和快速数据处理算法将图像数据转换为三维坐标。由于我们的系统提供了超过四万点的数据，一些快速的技术来处理大量的数据在几秒钟内是必要的。因此，我们引入了一个查找t，其中所有关于 ...更多信息 文中还介绍了电视摄像机引起的像差以及t指向光栅坐标与三维坐标之间的关系。透视变换给出了三维坐标（x，y，z）和相应的光栅坐标（u，v）如下等式，其中hij参数t0表示相机sy的几何配置。已经开发了一种校准方法来测量其坐标预先已知的六个不同点。可以确定参数hij，使得所有测量的数据满足等式（1）。(1)具有最小的sp误差。实验进行了使用我们的系统与电视摄像机和投影仪法令之间的长度50 c的偏差角。结果表明，该系统测量的圆柱体直径误差小于± 0.5mm。该系统对人体颌面部三维数据进行了处理，并存储在128 k字节的存储器中。我们现在打算将数据连接到三维数据编辑系统，如市场CAD/CAM系统，使数据更富有成效。少

Non-contact and accurate 3-dimensional profile measurement is hi desirable in the fields of mechanical engineering, orthodontics plas reconstructive surgery and human engineering.Important points of the 3-dimensional profile measurement are how obtain all 3-dimensional data as fast as possible, and how convert these data to 3-dimensional coordinates.In this research, we show one technique to enable fast 3-dimensi measurement of a human maxillo-facial morphology. As mentioned before profile of head is one of important concerns in the orthodontics and tic surgery. The principle of our measuring system is based on the Corded Pattern Projection Method. One feature of our system is tha ployment of image processor and fast data processing algorithm to co the image data to 3-D coordinates. Since our system gives data of more forty thousands of points, some fast technique to process a large numb data in a few seconds is needed. Therefore, we introduced a look-up t where all the information abo … More ut the aberration caused by the TV camera and also about the relation between the raster coordinates of the t Pointing and the 3-dimensional coordinates are embedded.Calibration of the camera system : Perspective transformation for gives the relation between 3-dimensional coordinates (x, y, z) and the c sponding raster coordinates (u, v) as the following equation where hij parameters to represents the geometrical configuration of camera sy Already one calibration method is develooed to measure six distingu points whose coordinates are known in advance. Parameters hij can be d mined so that all the data measured satisfy Eq. (1) with the least sp error. Experiments were performed using our system with length 50 c deviation angle between TV cameras and projector decrees. As shown d ters of cylinders were measured with error than + 0.5mm.In this system 3-D data of human maxillo-facial face were compre and stored in the 128 k byte memory. We are now intending to connect data to 3-D data edit system like a market CAD/CAM system so that data more fruitfully. Less