eCPD - Camera Calibration and why it is important
Date & Time
Sunday, 2 Jan 2022
- 5:00 pm
This is a recording of the live session held on 2 July 2020.
Accurate camera calibration has always been a prerequisite for photogrammetric measurement, irrespective of whether the application area is topographic mapping, engineering metrology or, more commonly nowadays, 3D model generation from imagery recorded using drones/UAVs. Traditionally, calibration has been recognised as a distinct operation within the photogrammetric processing pipeline, even as the process of recovering camera parameters has evolved from laboratory calibration through to on-the-job self-calibration. With the increasing adoption of so-called structure-from-motion (SfM) based software systems for multi-image photogrammetric orientation, which could be described as ‘black-box’ operations, there has been a tendency for users who are not specialists in photogrammetry to under appreciate the requirements for a reliable and accurate camera self-calibration. Irrespective of whether camera parameter determination is implicit within the SfM processing or explicit within a separate camera calibration process, usually based on a self-calibrating bundle adjustment, due attention must be paid to factors such as camera internal stability, imaging network geometry and the use of constraints in the object space, be they ground control points or GPS-recorded camera station positions, or both. Moreover, there are questions to address regarding the weighting of constraints, and the selection of appropriate camera parameters so as to avoid excessive projective coupling/correlation, especially between the camera interior and exterior orientation parameters. This seminar will address these and other aspects of metric camera calibration and discuss their importance in the optimisation of accuracy and reliability in photogrammetric measurement.
Professor Clive Fraser, University of Melbourne
Professor Clive Fraser is currently a Professorial Fellow in the Department of Infrastructure Engineering at the University of Melbourne, and a Science Advisor with FrontierSI (formerly the Cooperative Research Centre for Spatial Information). He was previously a Professor of Geomatics at the University of Melbourne, and prior to that was for 10 years Vice President of Geodetic Services, Inc. in Florida, a world-leading company in industrial photogrammetry systems and services. Prof. Fraser’s particular areas of research interest lie in digital close-range and industrial photogrammetry, and in the metric exploitation of both drone and high-resolution satellite imagery. He is a Fellow of both the Australian Academy of Technology and Engineering, and the American Society of Photogrammetry and Remote Sensing, an Honorary Fellow of SSSI and an Honorary Member of The Remote Sensing and Photogrammetric Society (UK). In recognition of his academic and professional work, which include authorship of more than 390 scientific publications, he has earned numerous international awards.
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