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Item Multiview-Consistent Color Sampling for Alpha Matting(The Eurographics Association, 2012) Kettern, Markus; Eisert, Peter; Andrea Fusiello and Michael WimmerWe propose a method for incorporating multiview information into color sampling methodologies for alpha matting. We extend the typical trimap input for matting algorithms to 3D space, enabling the association of stripes of pixels in semi-transparent regions like hair between different views without knowing or inferring their spatial structure. We also formulate a new cost function penalizing deviations of foreground color estimates between associated pixel stripes and its possible integration into a state-of-the-art color sampling approach.Item On User-Interaction in 3D Reconstruction(The Eurographics Association, 2012) Schneider, David C.; Eisert, Peter; Andrea Fusiello and Michael WimmerFor many computer graphics tasks such as segmentation, tracking or retargeting, algorithms are designed to allow user interaction. For real-world applications, tools which give users some form of control are often preferred over fully automatic ones. In 3D reconstruction, however, algorithms are typically non-interactive and errors are corrected after reconstruction in generic 3D modeling software. In this contribution, we discuss fundamental algorithmic considerations regarding interactivity in 3D reconstruction and we outline an optimization-based reconstruction framework which allows the incorporation of interactive tools as energy terms.