The Scheimpflug principle is commonly used in single-camera-based and multi-camera-based MFPP systems to extend the mutual overlap range of different views in the object space. We set up a dual-camera-based MFPP system and performed 3D measurements of plates, standard balls, and some specifically designed samples using the phase map stereo matching method. We conclude that the dual-camera-based system wins in measurement accuracy, while the single-camera-based system has better integrity, which may provide a reference for the system design in implementing industrial applications.
Stereo vision plays an essential role in non-contact 3D measurement, which employs two cameras to achieve applications such as visual synthesis, terrain surveying, and deformation detection. The commonly used Scheimpflug principle is expressed as the object plane, the image plane, and the lens plane intersect in a line, based on which stereo cameras can be slantwise focused on the object space with an overlapping field of view and depth of field. Based on our previously proposed calibration method, a stereo-rectification of Scheimpflug telecentric lenses is proposed in this paper. The effectiveness and accuracy of the proposed methods are verified by experiments.
In the lens-based imaging model, the Scheimpflug principle is expressed as the object plane, the image plane, and the lens plane intersect in a line. With this principle, the object surface in front of the lens can be tilted by installing a tilted sensor, thereby significantly extending the axial distribution of the clear-imaging area. In order to calibrate the bi-telecentric lens under the Scheimpflug condition, we derived a concise imaging model, and the corresponding calibration method without solving the rotation or tilt angle is proposed. The re-projection error is calculated in the experiment to verify the effectiveness of our method.
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