| Augmented Reality, is a new technology which integrates real-world information and that in virtual world. It produces virtual object which does not exist in reality with the use of computer graphics and visualization technologies, and by the sensing technology accurately places the virtual object to the real environment. At last, it outputs the video sequences which integrate with real world, through the display devices. In this thesis, it makes use of characteristics of co-existence between augmented reality technology and virtual reality component parts, which will be applied to equipment maintenance of assembly. It adds information of various parts of the computer in the correct position of the video signals and determines the order of their installation, and the installation location for contour line prompt. The maintenance of this thesis does not involve failure testing, only including the replacement of maintenance parts.This paper described the basic characteristics of augmented reality and the principle of the system operation, analyzed the system's function and performance requirements, and discussed the basic structure of the system, including system software and hardware construct principles and the operating process. The system consists of five functional modules: the video capture module, image processing module, the actual situation registration module, the message processing module, and video integration module. The real assembly scene video were captured by the video capture module; image processing module to process the video image by binarization, connected component analysis, affine transformation and template matching and so on, in order to identify the marker could be identified and at the same time get the four corners of the pixel coordinates of marker; inputting the above results into the actual situation registration module, then we get the homography matrix and the outer parameters of the camera; video integration module merge the real scene and virtual information to display in the screen, then complete the augment reality.The research on Abstract Registration technology included in Augmented Reality system is the emphasis of this paper. Using computer vision-based marker tracking method, the parts of the virtual and actual situation will be registered. What was found in this paper is that, with the distance increasing between CCD and the Marker, the angle narrowing, the difference with the actual distance on CCD and the Marker is increasing sharply, which affects registration accuracy. Before carrying out identification tags marking card, we use perspective projection method to transform it to the vertical axis with the CCD plane. The experiment results show that the registration error rates has been reduced from 1.2%~0.4% to 0.2%~0.1%. |
