Development of a Virtual Reality GIS Using Stereo Reconstruction
Date Issued
2005
Date
2005
Author(s)
Hsiung, Yuan-Kai
DOI
zh-TW
Abstract
In this paper, we built a virtual panorama scene based on computational stereo, and combined it with GIS which is developed by former studies to be a virtual reality GIS. Traditional computational stereo problems confer on only one stereo pair, this study expends it to a panorama case. We rotate two CCD cameras to grab several images around a specific place and then generate 3D models by these stereo pairs. Our main matching algorithm is the improved Graph Cut method, and the Rank method is used as a fast solution. We also provide a post-processing method that is performed depending on the disparity image and has real-time feedback so that we can easily correct bad points deriving from false detections. After getting all models what we need, we merge these models into a 3D virtual panorama scene. We use our own algorithm to translate models into cylinder coordinate system, find the overlapped region, assign weights according to the spatial locations, and then blend them. Since the models generated by computational stereo always have huge size, we use the memoryless simplification to simplify them for fast rendering and saving memories. The error between original model and 80% simplified model is 13.01%. This part is practiced by the GTS library. After doing all of the above, we save the virtual scenes into the GIS developed by former studies, so the users can query geometrical information and visit the virtual scene at the same time in our program. According to the manual preprocessing, we can auto detect at runtime to change scenes or prevent user’s moving to hold he in the scene, so the user can explore the scenes smoothly.
Subjects
立體視覺
虛擬實境
電腦圖學
computational stereo
virtual reality
computer graphics
GIS
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-94-R92631011-1.pdf
Size
23.31 KB
Format
Adobe PDF
Checksum
(MD5):f18e0903d752dabf1cedff4463194f79