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：2008
卷号：XXXVII Part B5
页码：101-106
出版社：Copernicus Publications
摘要：In computer vision field, structured-light is defined as the light with certain feature. Hence all of the light point, light line and light plane, which are projected by laser equipment and projector, can be called structured light. In many cases, the direction of those light from structured light resource are unknown in space. If the direction of the structured light can be obtained by the equipment from which it is transmitted, the surveying steps and the following data processing will be facilitated. According to what was mentioned above, two kinds of scanning mathematical models of structured light with known angle based on laser theodolite are introduced. When the horizontal circle is fixed and collimation axis rotates around the horizontal axis, a plumb line plane is formed with the scanning of transmitted laser beam. When the vertical circle is fixed and the alidade rotates around the vertical axis, a circular cone surface is formed with the scanning of transmitted laser beam. If one camera is used to shoot the structured light projected on the object, 3-D coordinate of point can be obtained after extracting structured light information on the image and calculating point of intersection of photography line and structured light scanning surface. Thereby, the detailed mathematical equations of calculating 3-D coordinates of structured light is deduced based on laser theodolite in structured light photogrammetry. Through the solution of the equations composed of collinearity condition equations and structured light scanning equation, the expressions of 3D coordinates can be inferred simply and clearly. In order to testify the accuracy of the above theory, precision testing experiment and 3-D reconstruction of object experiment are conducted. In precision testing experiment, close range indoor 3- D control field with high precision is regarded as the surveyed object whose precision is less than 0.1mm. The known coordinates of control point is thought as true value and the calculated 3-D coordinates as measured value to calculate the precision of structured light photogrammetry. Under the case of plumb line surface scanning mode, twenty control points are chosen to calculate the precision. The mean square error of coordinates are m X =±0.44mm, m Y =±0.45mm, m Z =±0.85mm separately. Under the case of circular cone surface scanning mode, forty seven control points are chosen to calculate the precision. The mean square error of coordinates are m X =±0.34mm, m Y =±0.12mm, m Z =±0.70mm separately. In 3-D reconstruction of object experiment, a mannequin is considered as the reconstruction object and the experimental instruments are placed as what is done in the above experiments. The 3- D model is reconstructed respectively according to plumb line surface scanning mode and circular cone surface scanning mode. The above experiments prove the accuracy of Photogrammetry theory of structured light based on laser theodolite
关键词：Structured light; Angle; Industrial Photogrammetry; Computer Vision; Reconstruction; Non-metric Digital Camera; ; Mathematics Model; Object without Texture
