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.
Most of the traditional microscopic systems are based on the structural design of a single telecentric camera combined with a single projector. The projector in such system needs to be accurately calibrated as an additional view to complete the 3D measurement with the camera. However, it is difficult to achieve high-accuracy calibration due to problems such as gamma, lens distortion, and additional lenses that are difficult to accurately align. In this work, we present a structural design of microscopic 3D measurement system based on dual-telecentric optical path, which contains two camera that can be accurately calibrated and a projection light path. Our design can make full use of the advantages of the full-field structured light projection and is convenient to calibrate. Two different perspectives can provide 3D data from different depth and multiple angles simultaneously so that measurement volume can be enlarged by superimposing the data.
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