混合硬件跟踪定位的空间信息虚实配准

Virtual-Real Registration of Spatial Information Based on Hybrid Hardware Tracking and Location

为了适应户外增强现实空间信息表达的实时性、移动性、准确性和鲁棒性,提出采用GPS结合三维电子罗盘直接获取用户头部位置和姿态数据的基于硬件跟踪设备的虚实配准方法:通过人机交互方式确定虚拟物体及属性信息在3D欧氏世界坐标系中的位置和姿态,采用GPS结合三维电子罗盘跟踪用户头部位置和姿态,得到从世界坐标到相机坐标的转换矩阵,避免了从世界坐标系到相机坐标系的转换计算。已知相机内部参数的前提下,将相机坐标转换到2D像平面坐标,实现虚拟物体及属性信息与真实场景图像的合成显示。其中GIS为户外增强现实系统提供位置相关的虚拟信息源,而户外增强现实技术为空间信息可视化表达提供了新界面。

Virtual-real registration is one of three characteristics of outdoor augmented reality.Methods choice of spatial information virtual-real registration has an effective influence on the whole system performance and the existing familiar approaches are limited to indoor augmented reality applications.It has only just begun that augmented reality technology is applied into spatial information visualization representation.In order to meet the basic characteristics of outdoor augmented reality spatial information representation such as real-time,mobility,accuracy and robustness and so on,it puts forward and practices a hybrid hardware registration method which uses GPS and 3D electronic compass to obtain position and pose of user′s head.Given position and pose in world coordinates of virtual objects through HCI,it obtains position and pose of user′s head to get transformation matrix from world coordinates to camera coordinates.Known internal camera parameters,transforming camera coordinates to 2D image plane coordinates,it achieves combination of virtual objects and real scene image.GIS provides a virtual location-based information sources for outdoor augmented reality system,while the outdoor augmented reality technology provides a new interface for spatial information visualization.