Mohammad PASHAEI
(Naghsh Avaran Toos Company, Tehran, Iran)
Keywords: Laser Scanning, Close-Range Photogrammetry, Data Fusion, 3D Colored Point Cloud
Abstract:
The fusion of the laser scanner data, with its very rich point cloud, and the digital image, with its very detailed information about the radiometric characteristics, to produce optimum 3D model, not only from the accuracy point of view, but also from the simplicity of capturing and the visualization quality as well, is considered recently one of the important tasks in the surveying field.
In this paper a solution for a rigorous fusion of the two measuring concepts and information sources to improve the geometry of the model and supporting the visual quality of the linear features like edges and reliefs created with artistically fine details in the historical scenes will be presented, where natural points extracted from the rich point cloud of the laser scanning system are used to register the digital images at the same coordinate system of the point cloud, then each point of the cloud is attached to its corresponding pixel of the image and will be fed back by its correct color from the digital image. To extract the fine details appearing in the image and to fuse them in the point cloud with their true colors, a useful technique is developed, in which the corresponding 3D coordinates for the in between image pixels are computed using the 3D coordinates of the adjacent pixels. The developed approach could be used in representing real objects more adequately with a good metric accuracy and it seems to be beneficial in fields of cultural heritage documentation, and industrial applications.