Chen S Y, Li Y F, Zhang Jianwei
College of Information Engineering, Zhejiang University of Technology, 310014 Hangzhou, China.
IEEE Trans Image Process. 2008 Feb;17(2):167-76. doi: 10.1109/TIP.2007.914755.
Structured light vision systems have been successfully used for accurate measurement of 3-D surfaces in computer vision. However, their applications are mainly limited to scanning stationary objects so far since tens of images have to be captured for recovering one 3-D scene. This paper presents an idea for real-time acquisition of 3-D surface data by a specially coded vision system. To achieve 3-D measurement for a dynamic scene, the data acquisition must be performed with only a single image. A principle of uniquely color-encoded pattern projection is proposed to design a color matrix for improving the reconstruction efficiency. The matrix is produced by a special code sequence and a number of state transitions. A color projector is controlled by a computer to generate the desired color patterns in the scene. The unique indexing of the light codes is crucial here for color projection since it is essential that each light grid be uniquely identified by incorporating local neighborhoods so that 3-D reconstruction can be performed with only local analysis of a single image. A scheme is presented to describe such a vision processing method for fast 3-D data acquisition. Practical experimental performance is provided to analyze the efficiency of the proposed methods.
结构光视觉系统已成功应用于计算机视觉中三维表面的精确测量。然而，到目前为止，它们的应用主要局限于扫描静止物体，因为为了恢复一个三维场景需要拍摄数十张图像。本文提出了一种通过特殊编码视觉系统实时采集三维表面数据的想法。为了实现对动态场景的三维测量，数据采集必须仅用单张图像来完成。提出了一种独特颜色编码图案投影的原理，以设计一个颜色矩阵来提高重建效率。该矩阵由一个特殊的编码序列和若干状态转换生成。计算机控制彩色投影仪在场景中生成所需的颜色图案。在这里，光码的唯一索引对于颜色投影至关重要，因为必须通过合并局部邻域来唯一识别每个光栅，以便仅通过对单张图像的局部分析来执行三维重建。提出了一种方案来描述这种用于快速三维数据采集的视觉处理方法。提供了实际实验性能来分析所提方法的效率。
