ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
22.2
Conference information
Extraction of Camera Parameters Using Projective Invariance for Virtual Studio
SeoWon HanJoonWhaon LEEMasayuki NAKAJIMA
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CONFERENCE PROCEEDINGS FREE ACCESS

Pages 1-6

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Abstract
Currently virtual studio has used the cromakey method in which an image is captured, and the blue portion of that image is replaced by a graphic image or a real image. The replaced image must be changed according to the camera motion. This paper proposes a novel method to extract camera parameters using the recognition of pentagonal patterns which are painted on the blue screen. The corresponding parameters are position, direction and focal length of the camera in the virtual studio. At first, pentagonal patterns are extracted through image processing, and the matched points of two projected patterns are found using invariant features of the pentagon. Then, the projective transformation of two projected images and the camera parameters are calculated using the matched points. Simulation results indicate that camera parameters are more easily calculated compared to the conventional methods.
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© 1998 The Institute of Image Information and Television Engineers
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