バーチャルスタジオのための投影変換に不変な特徴を用いたカメラパラメータ抽出 [in Japanese] Extraction of Camera Parameters Using projective invariance for Virtual Studio [in Japanese]
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Virtual Studio currently uses cromakey method in which a image is captured, and blue portion of that image is replaced by Computer Graphics image or real image. The replaced image must be changed according to the camera motion. This paper proposes a method to extract camera parameters (camera position, rotation and focus) using recognition of pentagonal patterns. At first, we find matching points of two projective images using invariable features of pentagon. Then, we calculate the projective transformation of two projective images and camera parameters using matching points. Simulation results indicate that camera parameters are calculated easily compared with conventional methods.
- ITE Technical Report
ITE Technical Report 21.28(0), 49-54, 1997
The Institute of Image Information and Television Engineers