By Raphaële Héno
Conventional topographic databases, bought through catch on aerial or spatial pictures offer a simplified 3D modeling of our city setting, answering the wishes of diverse purposes (development, threat prevention, mobility administration, etc.). besides the fact that, once we need to characterize and study extra advanced websites (monuments, civil engineering works, archeological websites, etc.), those versions now not suffice and different acquisition and processing capability must be applied. This ebook specializes in the learn of tailored lifting capability for "notable buildings". The tools tackled during this booklet disguise lasergrammetry and the present strategies of dense correlation in line with pictures utilizing traditional photogrammetry.
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Extra info for 3D Modeling of Buildings. Outstanding Sites
Thus, it is preferable to calibrate the camera on several images taken especially for this purpose, over an area with both texture and depth. For a given camera, any new combination “zoom + focus” theoretically requires a new calibration. 2), it is useful to have overlapping images in a different stereoscopic configuration, in order to discriminate between the ambiguities among all the pixels contained in the objects parallel to the base. 16) where a central image is taken, followed by two images, one on each side, and two more, with one above and one below.
Time-of-flight cameras are able to provide a distance measurement for each pixel and can record up to 50 3D images per second. The size of the sensors is again rather small, but applications in the field of architectural surveying may soon be set to emerge [RIN 13]. 5. Survey control data At the time of image surveying, control points featured in the chosen referencing system (the global system) are earmarked, which will be used to georeference the photogrammetric products. These points can be natural details or artificial targets.
The most difficult aspect in this case is to find the camera model as well as the geometric characteristics: focal distance, law of optical distortion and possibly fiducial markers, which would help us to define the precise link between the digital “image” coordinate system and the camera frame coordinate system. 5. 4. How do you measure with a camera? 1. Modeling the raw material: the image The image taken by a traditional camera (directly descended from Leonardo da Vinci’s camera obscura) is modeled by the projection of the real world (in three dimensions) onto a two-dimensional surface (the camera image plane).