Colour scans from 3D laser scanning
A 3D laser scanner is capturing, apart from the object geometry, also the intensity of the laser reflections on the object. With this the different object materials are determined. The intensities of each point are registered and can be displayed in the point cloud as grey scale, prismatic colour, etc.In practice another possibility is of great importance: it is possible to register all captured points with its according colour information which this object points have in reality. A red wall will for example be displayed in the scan with red RGB colour space.
From the individual scanning points pictures are taken with an HDR digital camera, from which panorama pictures are generated. These pictures are projected on the point clouds of the individual scans, thus a coloured point cloud is generated.
With this method point clouds can be display in a much more realistic way. Therefore the interpretation of objects in the point cloud gets much more easier – especially for designers and executives.
In scans, which have been executed with a high resolution, it is even possible to read signs in the point cloud. In scans with intensity value, such signs can only be read if they have a high contrast.
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