{"type":"ScholarlyArticle","title":"Sensor Motion and Relative Depth From Difference Fields of Optic Flows","authors":[{"name":"Joachim H. Rieger","slug":"joachim-h-rieger","given":"Joachim H.","family":"Rieger","affiliation":"Computer and Information Science Department University of Massachusetts Amherst , Massachusetts 01003"},{"name":"Daryl T. Lawton","slug":"daryl-t-lawton","given":"Daryl T.","family":"Lawton","affiliation":"Computer and Information Science Department University of Massachusetts Amherst , Massachusetts 01003"}],"abstract":"This paper develops a simple and robust procedure for recovering sensor motion parameters from image sequences induced by unconstrained sensor motion relative to a stationary environment. Difference vectors of optic flows approximate the orientations of the translational field lines in image areas in which there is depth variance between the corresponding environmental points and sufficient angular separation from the translational axis. This is developed into a procedure consisting of four steps: 1) locally computing difference vectors from an optic flow field; 2) thresholding the difference vectors; 3) minimizing the angles between the difference vector field and a set of radial field lines which correspond to a particular translational axis; and 4) extracting the translational and rotational component fields given the translational axis. This procedure does not require a priori knowledge_ about sensor motion or structure of the scene. It depends critically on sufficient variation in depth along some visual directions to endow the flow field with discontinuities. We present results of applying the procedure to sparse and low resolution displacement fields.","doi":null,"url":"https://ijcai.org/proceedings/1983/237","pdf":"https://ijcai.org/proceedings/1983/0237.pdf","markdown":"https://ijcai.org/proceedings/1983/237.md","bibtex":"https://ijcai.org/proceedings/1983/bibtex/237","volume":{"slug":"1983","title":"Proceedings of the Eighth International Joint Conference on Artificial Intelligence","short_title":"IJCAI 1983","url":"https://ijcai.org/proceedings/1983/","year":1983,"location":"Karlsruhe, West Germany","dates":"","editors":"Alan Bundy","isbn":"","publisher":"International Joint Conferences on Artificial Intelligence","doi_prefix":""},"section":"Vision","track":"Vision","number":237,"pages":{"first":1027,"last":1030},"keywords":[],"videos":[],"references":[{"position":1,"raw":"Ballard, D. 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B","doi":null,"url":null,"internal_url":null},{"position":9,"raw":"O'Rourke, J., \"Motion Detection Using Hough Techniques\", Proceedings of PJUP. pp. 82-87, 1981.","title":"Motion Detection Using Hough Techniques","authors":"J O'rourke","year":"1981","venue":"Proceedings of PJUP","doi":null,"url":null,"internal_url":null},{"position":10,"raw":"Prazdny, K., \"Egomotion and Relative Depth Map from Optical Flows\", Bioi. Cybernet ., vol. 36, pp. 87-102, 1980.","title":"Egomotion and Relative Depth Map from Optical Flows","authors":"K Prazdny","year":"1980","venue":"Bioi. Cybernet","doi":null,"url":null,"internal_url":null},{"position":11,"raw":"Rieger, J. H., \"'nformation in Optical Flows Induced by Curved Paths of Observation\", J. Opt. Soc. Am., vol. 73, pp. 339-344, 1983.","title":"nformation in Optical Flows Induced by Curved Paths of Observation","authors":"J H Rieger","year":"1983","venue":"J. Opt. Soc. Am","doi":null,"url":null,"internal_url":null},{"position":12,"raw":"Rieger, J. H., and Lawton, D. T., \"Determining the Axis of Translation from Optic Flow Generated by Arbitrary Sensor Motion\", COINS Technical Report, 83-01,1983.","title":"Determining the Axis of Translation from Optic Flow Generated by Arbitrary Sensor Motion","authors":"J H Rieger, D T Lawton","year":"1983","venue":"COINS Technical Report","doi":null,"url":null,"internal_url":null},{"position":13,"raw":"Wagner, H., \"Flow-field Variables Trigger Landing in Flies\", Nature, vol. 297, pp. 147-148, 1982.","title":"Flow-field Variables Trigger Landing in Flies","authors":"H Wagner","year":"1982","venue":"Nature","doi":null,"url":null,"internal_url":null}],"license_note":"Copyright International Joint Conferences on Artificial Intelligence."}