Back to Search
Start Over
A Vector-Based Backward Projection Method for Robust Detection of Occlusions When Generating True Ortho Photos
- Source :
- GIScience & Remote Sensing. 47:412-424
- Publication Year :
- 2010
- Publisher :
- Informa UK Limited, 2010.
-
Abstract
- One of the problems in detecting occlusions when generating true ortho photos is false occlusion and false visibility caused by rolling terrain, and the resolution difference between the digital surface model (DSM) and the images. Published methods are plagued by unstable computation and have considerable noise. The paper presents a vector-based backward projection (VBP) method for detecting occlusions. First, the method projects vector polygons representing the surface of buildings to image space. Next, it derives their true coverage by judging the occupancy priority for the overlap. It then determines the visibility of building and digital elevation model (DEM) grids. Finally, it generates a true ortho image by differential rectification. In addition, this paper develops methods to keep all steps robust, such as dubious region growing methods for rasterization and judgment formulas for boundary noise elimination, which makes VBP practical. Experiments using the Z-Buffer method, the projection-ray-angle-...
- Subjects :
- business.industry
Computation
Visibility (geometry)
ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION
Boundary (topology)
Terrain
Region growing
Projection method
General Earth and Planetary Sciences
Computer vision
Artificial intelligence
Noise (video)
Projection (set theory)
business
ComputingMethodologies_COMPUTERGRAPHICS
Mathematics
Subjects
Details
- ISSN :
- 19437226 and 15481603
- Volume :
- 47
- Database :
- OpenAIRE
- Journal :
- GIScience & Remote Sensing
- Accession number :
- edsair.doi...........a22b173ccff1eb77bf554a3d2b0a5666