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Percept."],"published-print":{"date-parts":[[2009,9]]},"abstract":"<jats:p>In this article we evaluate the use of approximate visibility for efficient global illumination. Traditionally, accurate visibility is used in light transport. However, the indirect illumination we perceive on a daily basis is rarely of high-frequency nature, as the most significant aspect of light transport in real-world scenes is diffuse, and thus displays a smooth gradation. This raises the question of whether accurate visibility is perceptually necessary in this case. To answer this question, we conduct a psychophysical study on the perceptual influence of approximate visibility on indirect illumination. This study reveals that accurate visibility is not required and that certain approximations may be introduced.<\/jats:p>","DOI":"10.1145\/1609967.1609971","type":"journal-article","created":{"date-parts":[[2009,10,6]],"date-time":"2009-10-06T18:18:59Z","timestamp":1254853139000},"page":"1-14","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":19,"title":["Perceptual influence of approximate visibility in indirect illumination"],"prefix":"10.1145","volume":"6","author":[{"given":"Insu","family":"Yu","sequence":"first","affiliation":[{"name":"University College London, London, U.K."}]},{"given":"Andrew","family":"Cox","sequence":"additional","affiliation":[{"name":"University College London, London, U.K."}]},{"given":"Min H.","family":"Kim","sequence":"additional","affiliation":[{"name":"University College London, London, U.K."}]},{"given":"Tobias","family":"Ritschel","sequence":"additional","affiliation":[{"name":"MPI Informatik, Saarbr\u00fccken, Germany"}]},{"given":"Thorsten","family":"Grosch","sequence":"additional","affiliation":[{"name":"MPI Informatik, Saarbr\u00fccken, Germany"}]},{"given":"Carsten","family":"Dachsbacher","sequence":"additional","affiliation":[{"name":"Universit\u00e4t Stuttgart, Stuttgart, Germany"}]},{"given":"Jan","family":"Kautz","sequence":"additional","affiliation":[{"name":"University College London, London, U.K."}]}],"member":"320","published-online":{"date-parts":[[2009,10,6]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1145\/1103900.1103927"},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1145\/1360612.1360633"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1145\/1073204.1073319"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1145\/192161.192179"},{"key":"e_1_2_1_5_1","volume-title":"Optical Radiation Measurements Visual Measurements","volume":"5","author":"Bartleson C. 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