Silhouette and stereo fusion for 3D object modeling

Carved Visual Hulls for Image-Based Modeling

“…Hernández Esteban and Schmitt (2004) propose to use the visual hull to initialize the deformation of a surface mesh under the influence of photoconsistency constraints expressed by gradient flow forces (Xu and Prince, 1997): See (Keriven, 2002) for a related approach combining geometric and photometric approaches. Although this method yields excellent results, its reliance on snakes for iterative refinement makes it susceptible to local minima.…”

“…While geometric constraints have been ignored in (Vogiatzis et al, 2005) in the global optimization process, our approach affords in its first two steps an effective method for enforcing hard geometric constraints during the global optimization process. As demonstrated in Section 6, the third step, similar in spirit to the local optimization techniques proposed in (Hernández Esteban and Schmitt, 2004;Keriven, 2002), remains nonetheless essential in achieving highquality results. The overall process is illustrated in Fig.…”

“…The smoothness term is the same as in the previous section. The rim consistency term is similar to the one proposed in (Hernández Esteban and Schmitt, 2004). Consider an apparent contour γ represented by a discrete set of points q j together with the corresponding viewing rays r j , we add rim consistency forces to vertices as follows (Fig.…”

“…This article addresses the problem of acquiring high-quality solid models 1 of complex three-dimensional (3D) shapes from multiple calibrated photographs, a process dubbed image-based modeling (Seitz and Dyer, 1997;Roy and Cox, 1998;Kutulakos and Seitz, 2000;Kolmogorov and Zabih, 2002;Matusik et al, 2002;Hernández Esteban and Schmitt, 2004;Pons et al, 2005;Vogiatzis et al, 2005;Sinha and Pollefeys, 2005;Tran and Davis, 2006;Furukawa and Ponce, 2006a;Goesele et al, 2006;Hornung and Kobbelt, 2006;Strecha et al, 2006). The quality of reconstructions has been rapidly improving in the last decade due to the developments of digital photography and the sophistication of proposed algorithms.…”

“…In contrast, variational methods explicitly seek the surface that minimize image discrepancy. Variants of this approach based on snakes iteratively deform a surface mesh until convergence (Hernández Esteban and Schmitt, 2004;Soatto et al, 2003). Level-set techniques, on the other hand, implicitly represent surfaces as the zero set of a time-varying volumetric density (Faugeras and Keriven, 1998;Keriven, 2002).…”