The circular imaging block in close-range photogrammetry

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Publications / TKK Institute of Photogrammetry and Remote Sensing, 1/2005
Photogrammetric 3D measuring procedure needs careful planning, especially in the close-range case, in order to fulfill requirements with respect to accuracy and reliability of measurements. In the special case of indoor environment, where imaging is to be taken inside the object space, some difficulties concerning the imaging procedure can be expected. In these environments a special attention has to be paid to the arrangement of sensible imaging geometry, which will guarantee the precision of observations and the reliability of estimates. Sometimes, the division of the measuring task into smaller sub-tasks cannot be avoided. This, however, requires more planning in respect of data registering in order to get the sub-models into the same coordinate system. In this research the issue stated above is studied and a solution to the problems is searched and found via adjusting the imaging procedure suitable to this special case. Great attention is paid to the geometrical aspect of imaging for 3D measurements and robustness of the solution. In this research a new Circular Imaging Block method has been developed for measuring tasks in the inside scene environment. The new method is based on constrained imaging and least squares estimation. One objective of the research has been to simplify the planning stage of the photogrammetric measuring procedure in special circumstances. The controlled imaging procedure improves the opportunity to assess the accuracy of measurements beforehand, and diminishes the need of assistance with an unexperienced user to design and accomplish the imaging. Also, the number of undesirable coordinate transformations can be decreased, since all measurements from one imaging station will be in one and the same coordinate system. Results from real-world experiments verify that an adequate level of accuracy of measurements for object reconstruction in general is attainable with this method. Also, tests indicate that the level of reliability, which is expected in typical close-range measuring cases, can be reached. The advantages of the method can be encapsulated as the straightforwardness of imaging, no need of control data, and the use of assisted automatic procedures in image measurements.
photogrammetry, close-range, estimation, image block, block adjustment, accuracy, reliability
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