{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,10,24]],"date-time":"2023-10-24T06:10:29Z","timestamp":1698127829785},"reference-count":11,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2007,3,21]],"date-time":"2007-03-21T00:00:00Z","timestamp":1174435200000},"content-version":"vor","delay-in-days":5558,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Systems &amp; Computers in Japan"],"published-print":{"date-parts":[[1992,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Using a geometrical optics model, a method is derived for estimating distance from two images with blur due to defocus aberration taken under different conditions of aperture sizes in general illumination to an object.<\/jats:p><jats:p>First, it is shown that the Fourier spectrum of geometrical optics spatial frequency characteristics can be approximated by Gaussian\u2010type functions.<\/jats:p><jats:p>Next, the relationship between radii of blur circles and Gaussian\u2010type functions is clarified. It is shown that the ratio of Fourier spectra of two defocused images depends only on the radii of blur circles and that the distance to the object can be estimated by estimating blur spreading radii from two defocused images by the least\u2010square method. Experiments were conducted using commercially available equipment. Distance errors within 9 percent were obtained in the cases of defocused images with <jats:italic>F<\/jats:italic> = 1.4 and <jats:italic>F<\/jats:italic> = 2.8 and of about 4 percent in the cases of defocused images of general scenes with <jats:italic>F<\/jats:italic> = 2 and <jats:italic>F<\/jats:italic> = 4. Thus, the effectiveness of this method was shown.<\/jats:p>","DOI":"10.1002\/scj.4690231007","type":"journal-article","created":{"date-parts":[[2007,7,7]],"date-time":"2007-07-07T21:55:08Z","timestamp":1183845308000},"page":"81-91","source":"Crossref","is-referenced-by-count":0,"title":["Extracting distance from defocused images with different aperture sizes"],"prefix":"10.1002","volume":"23","author":[{"given":"Masahiko","family":"Iwane","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2007,3,21]]},"reference":[{"issue":"4","key":"e_1_2_1_2_2","first-page":"337","article-title":"Distance sensor for three\u2010dimensional object recognition and sweeping technique","volume":"26","author":"Matsusita T.","year":"1987","journal-title":"Measurement and Control"},{"issue":"2","key":"e_1_2_1_3_2","first-page":"5","article-title":"Distance extraction method for robots","volume":"26","author":"Idezawa M.","year":"1987","journal-title":"Measurement and Control"},{"key":"e_1_2_1_4_2","volume-title":"Obstacle Avoidance and Navigation in the Real World by a Seeing Robot Rover","author":"Moravec H. 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P.","year":"1986"}],"container-title":["Systems and Computers in Japan"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1002%2Fscj.4690231007","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/scj.4690231007","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,10,23]],"date-time":"2023-10-23T12:08:20Z","timestamp":1698062900000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/scj.4690231007"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1992,1]]},"references-count":11,"journal-issue":{"issue":"10","published-print":{"date-parts":[[1992,1]]}},"alternative-id":["10.1002\/scj.4690231007"],"URL":"https:\/\/doi.org\/10.1002\/scj.4690231007","archive":["Portico"],"relation":{},"ISSN":["0882-1666","1520-684X"],"issn-type":[{"value":"0882-1666","type":"print"},{"value":"1520-684X","type":"electronic"}],"subject":[],"published":{"date-parts":[[1992,1]]}}}