Radiosity and realistic image synthesis
Radiosity and realistic image synthesis
IEEE Transactions on Pattern Analysis and Machine Intelligence
Stereo Matching with Transparency and Matting
International Journal of Computer Vision - 1998 Marr Prize
SIGGRAPH '84 Proceedings of the 11th annual conference on Computer graphics and interactive techniques
ACM SIGGRAPH 2004 Papers
ACM SIGGRAPH 2005 Papers
IEEE Computer Graphics and Applications
Image and video matting: a survey
Foundations and Trends® in Computer Graphics and Vision
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Image and video matting is used to extract objects from their original backgrounds in order to place them on a different background. The traditional matting model is a combination of foreground and background colors, i.e., I = αF + (1 - α)B. Even with good cameras, limited depth-of-focus means that often both the object and background are blurred at the boundaries. Does the matting model still apply? To understand this and other cases better, we investigate image matting from a physical perspective. We start with 3D objects and examine the mechanism of image matting due to geometrical defocus. We then derive a general matting model using radiometry and geometric optics. The model accounts for arbitrary surface shapes, defocus, transparency, and directional radiance. Under certain conditions, the physical framework subsumes the traditional matting equation. The new formulation reveals a fundamental link between parameter a and object depth, and this establishes a framework for designing new matting algorithms.