期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2002
卷号：XXXIV Part 3 B
页码：181-185
出版社：Copernicus Publications
摘要：Previously, we developed a real time 3-D measurement system based on slit-ray projection method, which enables us to obtain serial range images at 1/30 seconds per scene with an error within ±0.3%. It, however, uses laser beam as light source, so it has some disadvantages in safety and applied field of it is somewhat limited. In this regards, the aim of this paper is to develop a new system for 3-D measurement using incoherent light source, which is not dangerous to surroundings and enables us to obtain serial high-resolution range images in real time. Our new system is based on intensity ratio method. In this method, the target space is encoded by intensity ratio of two light patterns projected alternately onto the target space. In this research, a .at light pattern and a linearly increasing one along horizontal direction are used as two light patterns and projected from a DLP projector on the market. Since one range image is obtainable from two successive video images corresponding to two light patterns and procedure for range image calculation is very simple and carried out at high speed, serial range images are obtained at high speed from serial video images, which are captured by a 3CCD video camera on the market synchronizing with alternate projection of two light patterns. Thus our system realizes to obtain serial range images in real time. In addition, since one range data is obtained from one pixel of the image plane of the video camera, spatial resolution of our system is same to that of the video camera. Moreover, since each component of our system is available on the market, total cost of it is very cheap. To improve accuracy of measurement by our system, optical characteristics of video camera and DLP projector are investigated and taken account into processing video images. Moreover, since accuracy is badly affected by the fact that re.ectance on the surface of the target depends on the frequency of the light projected, monochromatic light source is used in our system
关键词：Vision Sciences; Vision; Measurement; Graphics; Model; Close Range; Dynamic
