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Graph."],"published-print":{"date-parts":[[2011,5]]},"abstract":"<jats:p>The simulation of weathered appearance is essential in the realistic modeling of urban environments. A representative and particularly difficult effect to produce on a large scale is the effect of fluid flow. Changes in appearance due to flow are the result of both the global effect of large-scale shape, and local effects, such as the detailed roughness of a surface. With digital photography and Internet image collections, visual examples of flow effects are readily available. These images, however, mix the appearance of flows with the specific local context. We present a methodology to extract parameters and detail maps from existing imagery in a form that allows new target-specific flow effects to be produced, with natural variations in the effects as they are applied in different locations in a new scene. In this article, we focus on producing a library of parameters and detail maps for generating flow patterns; and this methodology can be used to extend the library with additional image exemplars. To illustrate our methodology, we show a rich collection of patterns applied to urban models.<\/jats:p>","DOI":"10.1145\/1966394.1966399","type":"journal-article","created":{"date-parts":[[2011,5,24]],"date-time":"2011-05-24T13:04:30Z","timestamp":1306242270000},"page":"1-13","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":20,"title":["Image-guided weathering"],"prefix":"10.1145","volume":"30","author":[{"given":"Carles","family":"Bosch","sequence":"first","affiliation":[{"name":"Yale University, New Haven, CT and REVES\/INRIA Sophia-Antipolis, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pierre-Yves","family":"Laffont","sequence":"additional","affiliation":[{"name":"REVES\/INRIA Sophia-Antipolis, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Holly","family":"Rushmeier","sequence":"additional","affiliation":[{"name":"Yale University, New Haven, CT"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Julie","family":"Dorsey","sequence":"additional","affiliation":[{"name":"Yale University, New Haven, CT"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"George","family":"Drettakis","sequence":"additional","affiliation":[{"name":"REVES\/INRIA Sophia-Antipolis, France"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2011,5,19]]},"reference":[{"key":"e_1_2_2_1_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1467-8659.2004.00777.x"},{"key":"e_1_2_2_2_1","doi-asserted-by":"publisher","DOI":"10.1145\/1186822.1073321"},{"key":"e_1_2_2_3_1","doi-asserted-by":"publisher","DOI":"10.1145\/1294685.1294711"},{"volume-title":"Digital Texturing and Painting","author":"Demers O.","key":"e_1_2_2_4_1","unstructured":"Demers , O. 2001. 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