Structured light measurement by double-scan technique
Structured light measurement by double-scan technique
复制标题
双扫描技术的结构光测量
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
C. Voland
中科院分区：
文献类型：
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作者：
H. Gaertner;P. Lehle;H. Tiziani;C. Voland
基于三角测量的3D测量系统（如光切片、结构光或立体视觉）具有共同的问题。物体表面的某些区域不被照亮，而其他区域则看不见。在这些区域中，无法获取范围数据，并且所得到的范围图是不完整的。提出了一种新的结构光测量装置，减少了许多表面的阴影/遮挡问题。对于结构光测量系统，将若干图案投影到待测量的物体上。CCD摄像机获取用结构光图案照明的物体的图像。对于CCD矩阵的每个像素，存在对应于投影仪的光平面的灰度值序列。CCD矩阵中像素的位置决定了观察光束。观察光束和光平面的交点产生物体表面点的三个坐标。在新的装置中，图案投影仪与相机一起使用。利用分束器、两个彩色滤光片和反射镜，可以得到两束不同颜色、不同入射角的光束。因此，物体上有两种彩色图案。彩色CCD摄像机获取图像用于距离数据测量。三个颜色通道中的两个检测相应颜色的投影图案。从两个测量计算距离数据图像。几乎完整的距离数据图像结果没有或只有少数区域没有距离信息。
3D-measurement systems, that are based on triangulation, like light sectioning, structured light or stereo vision have a common problem. Certain areas of the object surface are not illuminated and others cannot be seen. In these regions no range data can be acquired and the resulting range map is incomplete. A new measurement setup with structured light is presented reducing this shadow/occlusion problem for many surfaces. For structured light measurement systems several patterns are projected onto the object to be measured. A CCD-camera acquired the images of the object illuminated with structured light patterns. For each pixel of the CCD-matrix there is a sequence of gray-values that corresponds to a light plane of the projector. The position of the pixel in the CCD-matrix determines a viewing beam. The intersection point of the viewing beam and the plane of light yields the three coordinates of a surface point of the object. In the new setup a pattern projector is used together with a camera. With a beam splitter, two color filters and mirrors two beams of different color and different angle of incidence are obtained. Thus, two colored patterns superimpose on the object. A color CCD-camera acquires the image for the range data measurement. Two of the three color channels detect the projection pattern of the corresponding color. A range data image is calculated from the two measurements. A nearly complete range data image result with no or only a few regions without range information.