Environment matting into photographs using coloured RTcams

Chuan Li, P. Hall, P. Willis

Research output: Chapter or section in a book/report/conference proceedingChapter in a published conference proceeding


There has been continuing interest in using environment matting to capture the real-world's reflection and refraction from a foreground object. Environment matting require a calibrated warp, which is often defined non-parametrically. Although this is a powerful approach it suffers from two basic limitations: (i) there is a "blind spot" that cannot be a calibrated; (ii) a slight change in the object requires a full recalibration.This paper introduces a parametric approach that can overcome both of these limitations. We build upon a generalised model of a non-linear camera called an RTcam (Rational Tensor Camera, introduced in Section 3), for the first time showing its value to environment matting. In addition, we show how a restriction on RTcams can simulate the change in colour of an object as it appears in a coloured reflector (refractor). Hence we account for both geometric and colour changes with a single mathematical model. Finally, we show how, using the same camera model, the reflector properties can mapped from one to another.
Original languageEnglish
Title of host publicationIET Conference Publications
Publication statusPublished - 2008
EventIET 5th European Conference on Visual Media Production - London, UK United Kingdom
Duration: 27 Nov 200828 Nov 2008


ConferenceIET 5th European Conference on Visual Media Production
Country/TerritoryUK United Kingdom


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