29 April 2016 Position estimation for fiducial marks based on high intensity retroreflective tape
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Abstract
3D position estimation of an object usually involve computer vision techniques, which require fiducial markers attached to the objects surface. Modern technology provides a high intensity retroreflective material in the form of a tape which is easy to mount to the object and can be used as a base for fiducial marks. But inevitable drawback of the tapes with the highest retroreflective intensity is the presence of technological pattern which affects spatial distribution of retroreflected light and deforms border of any print on tape's surface. In this work we compare various shapes of metrological pattern and examine Fourier descriptors based image processing to obtain estimation of accuracy of mark image position. To verify results we developed a setup consisting of a camera based on Sony ICX274 CCD, 25 mm lens, 800 nm LED lightning and high intensity microprismatic tape. The experiment showed that there is no significant difference between proposed mark shapes as well as between direct and indirect contrast when proposed image processing is used. The experiments confirmed that the image processing implemented without elimination of non-reflective netting pattern can only provide an accuracy of coordinates extraction close to 1 pix.
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Anna Trushkina, Mariya Serikova, Anton Pantyushin, "Position estimation for fiducial marks based on high intensity retroreflective tape", Proc. SPIE 9896, Optics, Photonics and Digital Technologies for Imaging Applications IV, 98961H (29 April 2016); doi: 10.1117/12.2228141; https://doi.org/10.1117/12.2228141
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