{'fraction_non_alphanumeric': 0.021545319465081723, 'fraction_numerical': 0.009658246656760773, 'mean_word_length': 5.35377358490566, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Physical marker based stitching process of circular and non-circular interferograms

The usage of stitching technologies in the interferometrical precision optics measurement technique becomes more and more popular. There exist already a few metrology stages providing the stitching principle, such as, for example, the well known Sub-Aperture Stitching Interferometer for Aspheres (SSI-A1) [1] [2] [3] from QED technologies. For measurements with the SSI-A the greatest measurable diameter of the test object is approximately 280 mm [1]. As a consequence the University of Applied Sciences Deggendorf develops an own measuring system in order to test large telescope mirrors with a diameter of more than one meter which should be ready for application in 2012. The expected positioning accuracy of the measuring patches is significantly lower in comparison with the high-accurate SSI-A. Therefore a cross-correlation based translation detection tool is implemented in our current software solution. Since the metrology system is currently being established the SSI-A and the μPhase2 interferometer from TRIOPTICS are used as input data sources for the software development. Further this paper discusses the robustness of the translation detection tool and presents a stabilisation method of the stitching result with the aid of physical markers.