{"doi":"10.1364/JOSAA.24.000001","date_created":"2021-06-03T19:36:20Z","type":"journal_article","abstract":[{"lang":"eng","text":"Visual robot navigation in outdoor environments would benefit from an illumination-independent representation of images. We explore how such a representation, comprising a black skyline of objects in front of a white sky, can be obtained from dual-channel spectral contrast measures. Light from sky and natural objects under different conditions of illumination was analyzed by five spectral channels: ultraviolet, blue, green, red, and near infrared. Linear discriminant analysis was applied to determine the optimal linear separation between sky and object points. A statistical comparison shows that contrasts with large differences in the wavelength of the two channels, specifically ultraviolet-infrared, blue-infrared, and ultraviolet-red, yield the best separation. Within a single channel, the best separation was obtained for ultraviolet light. The gain in separation quality when all five channels were included is relatively small."}],"status":"public","publication_identifier":{"eissn":["1520-8532"],"issn":["1084-7529"]},"publication":"Journal of the Optical Society of America A","year":"2007","_id":"1225","citation":{"alphadin":"<span style=\"font-variant:small-caps;\">Kollmeier, Thomas</span> ; <span style=\"font-variant:small-caps;\">Röben, Frank</span> ; <span style=\"font-variant:small-caps;\">Schenck, Wolfram</span> ; <span style=\"font-variant:small-caps;\">Möller, Ralf</span>: Spectral contrasts for landmark navigation. In: <i>Journal of the Optical Society of America A</i> Bd. 24, The Optical Society of America (2007), Nr. 1, S. 1–10","chicago":"Kollmeier, Thomas, Frank Röben, Wolfram Schenck, and Ralf Möller. “Spectral Contrasts for Landmark Navigation.” <i>Journal of the Optical Society of America A</i> 24, no. 1 (2007): 1–10. <a href=\"https://doi.org/10.1364/JOSAA.24.000001\">https://doi.org/10.1364/JOSAA.24.000001</a>.","mla":"Kollmeier, Thomas, et al. “Spectral Contrasts for Landmark Navigation.” <i>Journal of the Optical Society of America A</i>, vol. 24, no. 1, The Optical Society of America, 2007, pp. 1–10, doi:<a href=\"https://doi.org/10.1364/JOSAA.24.000001\">10.1364/JOSAA.24.000001</a>.","ieee":"T. Kollmeier, F. Röben, W. Schenck, and R. Möller, “Spectral contrasts for landmark navigation,” <i>Journal of the Optical Society of America A</i>, vol. 24, no. 1, pp. 1–10, 2007.","short":"T. Kollmeier, F. Röben, W. Schenck, R. Möller, Journal of the Optical Society of America A 24 (2007) 1–10.","bibtex":"@article{Kollmeier_Röben_Schenck_Möller_2007, title={Spectral contrasts for landmark navigation}, volume={24}, DOI={<a href=\"https://doi.org/10.1364/JOSAA.24.000001\">10.1364/JOSAA.24.000001</a>}, number={1}, journal={Journal of the Optical Society of America A}, publisher={The Optical Society of America}, author={Kollmeier, Thomas and Röben, Frank and Schenck, Wolfram and Möller, Ralf}, year={2007}, pages={1–10} }","apa":"Kollmeier, T., Röben, F., Schenck, W., &#38; Möller, R. (2007). Spectral contrasts for landmark navigation. <i>Journal of the Optical Society of America A</i>, <i>24</i>(1), 1–10. <a href=\"https://doi.org/10.1364/JOSAA.24.000001\">https://doi.org/10.1364/JOSAA.24.000001</a>","ama":"Kollmeier T, Röben F, Schenck W, Möller R. Spectral contrasts for landmark navigation. <i>Journal of the Optical Society of America A</i>. 2007;24(1):1-10. doi:<a href=\"https://doi.org/10.1364/JOSAA.24.000001\">10.1364/JOSAA.24.000001</a>"},"main_file_link":[{"url":"https://opg.optica.org/josaa/abstract.cfm?URI=josaa-24-1-1"}],"date_updated":"2025-03-26T07:20:47Z","language":[{"iso":"eng"}],"publisher":"The Optical Society of America","title":"Spectral contrasts for landmark navigation","issue":"1","author":[{"full_name":"Kollmeier, Thomas","first_name":"Thomas","last_name":"Kollmeier"},{"first_name":"Frank","last_name":"Röben","full_name":"Röben, Frank"},{"first_name":"Wolfram","last_name":"Schenck","orcid_put_code_url":"https://api.orcid.org/v2.0/0000-0003-3300-2048/work/94914380","id":"224375","full_name":"Schenck, Wolfram","orcid":"0000-0003-3300-2048"},{"full_name":"Möller, Ralf","last_name":"Möller","first_name":"Ralf"}],"volume":24,"intvolume":"        24","page":"1 - 10","user_id":"33980","publication_status":"published"}