Academy & Industry Research Collaboration Center
In the recent years, 3D city reconstruction is one of the active researches in the field of photogrammetry. This paper is to improve and extend surface growing based segmentation in the X-Y-Z image in the form of 3D structured data with combination of spectral information of RGB and grayscale image to extract building roofs, streets and vegetation. In order to process 3D point clouds, hybrid segmentation is carried out in both object space and image space. Their experiments on three case studies verify that updating plane parameters and robust least squares plane fitting improves the results of building extraction especially in case of low accurate point clouds. In addition, region growing in image space has been derived to the fact that grayscale image is more flexible than image and results in more realistic building roofs.