--- _id: '3184' abstract: - lang: eng text: 'Algorithms for discrete energy minimization play a fundamental role for low-level vision. Known techniques include graph cuts, belief propagation (BP) and recently introduced tree-reweighted message passing (TRW). So far, the standard benchmark for their comparison has been a 4-connected grid-graph arising in pixel-labelling stereo. This minimization problem, however, has been largely solved: recent work shows that for many scenes TRW finds the global optimum. Furthermore, it is known that a 4-connecled grid-graph is a poor stereo model since it does not take occlusions into account. We propose the problem of stereo with occlusions as a new test bed for minimization algorithms. This is a more challenging graph since it has much larger connectivity, and it also serves as a better stereo model. An attractive feature of this problem is that increased connectivity does not result in increased complexity of message passing algorithms. Indeed, one contribution of this paper is to show that sophisticated implementations of BP and TRW have the same time and memory complexity as that of 4-connecled grid-graph stereo. The main conclusion of our experimental study is that for our problem graph cut outperforms both TRW and BP considerably. TRW achieves consistently a lower energy than BP. However, as connectivity increases the speed of convergence of TRW becomes slower. Unlike 4-connected grids, the difference between the energy of the best optimization method and the lower bound of TRW appears significant. This shows the hardness of the problem and motivates future research.' alternative_title: - LNCS author: - first_name: Vladimir full_name: Vladimir Kolmogorov id: 3D50B0BA-F248-11E8-B48F-1D18A9856A87 last_name: Kolmogorov - first_name: Carsten full_name: Rother, Carsten last_name: Rother citation: ama: 'Kolmogorov V, Rother C. Comparison of energy minimization algorithms for highly connected graphs. In: Vol 3952 LNCS. Springer; 2006:1-15. doi:10.1007/11744047_1' apa: 'Kolmogorov, V., & Rother, C. (2006). Comparison of energy minimization algorithms for highly connected graphs (Vol. 3952 LNCS, pp. 1–15). Presented at the ECCV: European Conference on Computer Vision, Springer. https://doi.org/10.1007/11744047_1' chicago: Kolmogorov, Vladimir, and Carsten Rother. “Comparison of Energy Minimization Algorithms for Highly Connected Graphs,” 3952 LNCS:1–15. Springer, 2006. https://doi.org/10.1007/11744047_1. ieee: 'V. Kolmogorov and C. Rother, “Comparison of energy minimization algorithms for highly connected graphs,” presented at the ECCV: European Conference on Computer Vision, 2006, vol. 3952 LNCS, pp. 1–15.' ista: 'Kolmogorov V, Rother C. 2006. Comparison of energy minimization algorithms for highly connected graphs. ECCV: European Conference on Computer Vision, LNCS, vol. 3952 LNCS, 1–15.' mla: Kolmogorov, Vladimir, and Carsten Rother. Comparison of Energy Minimization Algorithms for Highly Connected Graphs. Vol. 3952 LNCS, Springer, 2006, pp. 1–15, doi:10.1007/11744047_1. short: V. Kolmogorov, C. Rother, in:, Springer, 2006, pp. 1–15. conference: name: 'ECCV: European Conference on Computer Vision' date_created: 2018-12-11T12:01:52Z date_published: 2006-05-03T00:00:00Z date_updated: 2021-01-12T07:41:39Z day: '03' doi: 10.1007/11744047_1 extern: 1 main_file_link: - open_access: '0' url: http://research.microsoft.com/pubs/67889/paper_eccv06-trw.pdf month: '05' page: 1 - 15 publication_status: published publisher: Springer publist_id: '3498' quality_controlled: 0 status: public title: Comparison of energy minimization algorithms for highly connected graphs type: conference volume: 3952 LNCS year: '2006' ... --- _id: '3185' abstract: - lang: eng text: This paper describes models and algorithms for the real-time segmentation of foreground from background layers in stereo video sequences. Automatic separation of layers from color/contrast or from stereo alone is known to be error-prone. Here, color, contrast, and stereo matching information are fused to infer layers accurately and efficiently. The first algorithm, Layered Dynamic Programming (LDP), solves stereo in an extended six-state space that represents both foreground/background layers and occluded regions. The stereo-match likelihood is then fused with a contrast-sensitive color model that is learned on-the-fly and stereo disparities are obtained by dynamic programming. The second algorithm, Layered Graph Cut (LGC), does not directly solve stereo. Instead, the stereo match likelihood is marginalized over disparities to evaluate foreground and background hypotheses and then fused with a contrast-sensitive color model like the one used in LDP. Segmentation is solved efficiently by ternary graph cut. Both algorithms are evaluated with respect to ground truth data and found to have similar performance, substantially better than either stereo or color/contrast alone. However, their characteristics with respect to computational efficiency are rather different. The algorithms are demonstrated in the application of background substitution and shown to give good quality composite video output. author: - first_name: Vladimir full_name: Vladimir Kolmogorov id: 3D50B0BA-F248-11E8-B48F-1D18A9856A87 last_name: Kolmogorov - first_name: Antonio full_name: Criminisi, Antonio last_name: Criminisi - first_name: Andrew full_name: Blake, Andrew last_name: Blake - first_name: Geoffrey full_name: Cross, Geoffrey last_name: Cross - first_name: Carsten full_name: Rother, Carsten last_name: Rother citation: ama: Kolmogorov V, Criminisi A, Blake A, Cross G, Rother C. Probabilistic fusion of stereo with color and contrast for bilayer segmentation. IEEE Transactions on Pattern Analysis and Machine Intelligence. 2006;28(9):1480-1492. doi:10.1109/TPAMI.2006.193 apa: Kolmogorov, V., Criminisi, A., Blake, A., Cross, G., & Rother, C. (2006). Probabilistic fusion of stereo with color and contrast for bilayer segmentation. IEEE Transactions on Pattern Analysis and Machine Intelligence. IEEE. https://doi.org/10.1109/TPAMI.2006.193 chicago: Kolmogorov, Vladimir, Antonio Criminisi, Andrew Blake, Geoffrey Cross, and Carsten Rother. “Probabilistic Fusion of Stereo with Color and Contrast for Bilayer Segmentation.” IEEE Transactions on Pattern Analysis and Machine Intelligence. IEEE, 2006. https://doi.org/10.1109/TPAMI.2006.193. ieee: V. Kolmogorov, A. Criminisi, A. Blake, G. Cross, and C. Rother, “Probabilistic fusion of stereo with color and contrast for bilayer segmentation,” IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 28, no. 9. IEEE, pp. 1480–1492, 2006. ista: Kolmogorov V, Criminisi A, Blake A, Cross G, Rother C. 2006. Probabilistic fusion of stereo with color and contrast for bilayer segmentation. IEEE Transactions on Pattern Analysis and Machine Intelligence. 28(9), 1480–1492. mla: Kolmogorov, Vladimir, et al. “Probabilistic Fusion of Stereo with Color and Contrast for Bilayer Segmentation.” IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 28, no. 9, IEEE, 2006, pp. 1480–92, doi:10.1109/TPAMI.2006.193. short: V. Kolmogorov, A. Criminisi, A. Blake, G. Cross, C. Rother, IEEE Transactions on Pattern Analysis and Machine Intelligence 28 (2006) 1480–1492. date_created: 2018-12-11T12:01:53Z date_published: 2006-09-01T00:00:00Z date_updated: 2021-01-12T07:41:39Z day: '01' doi: 10.1109/TPAMI.2006.193 extern: 1 intvolume: ' 28' issue: '9' main_file_link: - open_access: '0' url: http://research.microsoft.com/pubs/67414/criminisi_pami2006.pdf month: '09' page: 1480 - 1492 publication: IEEE Transactions on Pattern Analysis and Machine Intelligence publication_status: published publisher: IEEE publist_id: '3496' quality_controlled: 0 status: public title: Probabilistic fusion of stereo with color and contrast for bilayer segmentation type: journal_article volume: 28 year: '2006' ... --- _id: '3186' abstract: - lang: eng text: We introduce a new approach to modelling gradient flows of contours and surfaces. While standard variational methods (e.g. level sets) compute local interface motion in a differential fashion by estimating local contour velocity via energy derivatives, we propose to solve surface evolution PDEs by explicitly estimating integral motion of the whole surface. We formulate an optimization problem directly based on an integral characterization of gradient flow as an infinitesimal move of the (whole) surface giving the largest energy decrease among all moves of equal size. We show that this problem can be efficiently solved using recent advances in algorithms for global hypersurface optimization [4, 2, 11]. In particular, we employ the geo-cuts method [4] that uses ideas from integral geometry to represent continuous surfaces as cuts on discrete graphs. The resulting interface evolution algorithm is validated on some 2D and 3D examples similar to typical demonstrations of level-set methods. Our method can compute gradient flows of hypersurfaces with respect to a fairly general class of continuous functional and it is flexible with respect to distance metrics on the space of contours/surfaces. Preliminary tests for standard L2 distance metric demonstrate numerical stability, topological changes and an absence of any oscillatory motion. alternative_title: - LNCS author: - first_name: Yuri full_name: Boykov, Yuri last_name: Boykov - first_name: Vladimir full_name: Vladimir Kolmogorov id: 3D50B0BA-F248-11E8-B48F-1D18A9856A87 last_name: Kolmogorov - first_name: Daniel full_name: Cremers, Daniel last_name: Cremers - first_name: Andrew full_name: Delong, Andrew last_name: Delong citation: ama: 'Boykov Y, Kolmogorov V, Cremers D, Delong A. An integral solution to surface evolution PDEs via geo cuts. In: Vol 3953. Springer; 2006:409-422. doi:10.1007/11744078_32' apa: 'Boykov, Y., Kolmogorov, V., Cremers, D., & Delong, A. (2006). An integral solution to surface evolution PDEs via geo cuts (Vol. 3953, pp. 409–422). Presented at the ECCV: European Conference on Computer Vision, Springer. https://doi.org/10.1007/11744078_32' chicago: Boykov, Yuri, Vladimir Kolmogorov, Daniel Cremers, and Andrew Delong. “An Integral Solution to Surface Evolution PDEs via Geo Cuts,” 3953:409–22. Springer, 2006. https://doi.org/10.1007/11744078_32. ieee: 'Y. Boykov, V. Kolmogorov, D. Cremers, and A. Delong, “An integral solution to surface evolution PDEs via geo cuts,” presented at the ECCV: European Conference on Computer Vision, 2006, vol. 3953, pp. 409–422.' ista: 'Boykov Y, Kolmogorov V, Cremers D, Delong A. 2006. An integral solution to surface evolution PDEs via geo cuts. ECCV: European Conference on Computer Vision, LNCS, vol. 3953, 409–422.' mla: Boykov, Yuri, et al. An Integral Solution to Surface Evolution PDEs via Geo Cuts. Vol. 3953, Springer, 2006, pp. 409–22, doi:10.1007/11744078_32. short: Y. Boykov, V. Kolmogorov, D. Cremers, A. Delong, in:, Springer, 2006, pp. 409–422. conference: name: 'ECCV: European Conference on Computer Vision' date_created: 2018-12-11T12:01:53Z date_published: 2006-04-28T00:00:00Z date_updated: 2021-01-12T07:41:39Z day: '28' doi: 10.1007/11744078_32 extern: 1 intvolume: ' 3953' month: '04' page: 409 - 422 publication_status: published publisher: Springer publist_id: '3497' quality_controlled: 0 status: public title: An integral solution to surface evolution PDEs via geo cuts type: conference volume: 3953 year: '2006' ... --- _id: '3404' alternative_title: - Manuals in Biomedical Research author: - first_name: Harald L full_name: Harald Janovjak id: 33BA6C30-F248-11E8-B48F-1D18A9856A87 last_name: Janovjak orcid: 0000-0002-8023-9315 - first_name: Ravi full_name: Sawhney, Ravi K last_name: Sawhney - first_name: Martin full_name: Stark, Martin last_name: Stark - first_name: Daniel full_name: Mueller, Daniel J last_name: Mueller citation: ama: 'Janovjak HL, Sawhney R, Stark M, Mueller D. Atomic force microscopy. In: Techniques in Microscopy for Biomedical Applications. Vol 2. World Scientific Publishing; 2006:213-284.' apa: Janovjak, H. L., Sawhney, R., Stark, M., & Mueller, D. (2006). Atomic force microscopy. In Techniques in Microscopy for Biomedical Applications (Vol. 2, pp. 213–284). World Scientific Publishing. chicago: Janovjak, Harald L, Ravi Sawhney, Martin Stark, and Daniel Mueller. “Atomic Force Microscopy.” In Techniques in Microscopy for Biomedical Applications, 2:213–84. World Scientific Publishing, 2006. ieee: H. L. Janovjak, R. Sawhney, M. Stark, and D. Mueller, “Atomic force microscopy,” in Techniques in Microscopy for Biomedical Applications, vol. 2, World Scientific Publishing, 2006, pp. 213–284. ista: 'Janovjak HL, Sawhney R, Stark M, Mueller D. 2006.Atomic force microscopy. In: Techniques in Microscopy for Biomedical Applications. Manuals in Biomedical Research, vol. 2, 213–284.' mla: Janovjak, Harald L., et al. “Atomic Force Microscopy.” Techniques in Microscopy for Biomedical Applications, vol. 2, World Scientific Publishing, 2006, pp. 213–84. short: H.L. Janovjak, R. Sawhney, M. Stark, D. Mueller, in:, Techniques in Microscopy for Biomedical Applications, World Scientific Publishing, 2006, pp. 213–284. date_created: 2018-12-11T12:03:09Z date_published: 2006-09-28T00:00:00Z date_updated: 2021-01-12T07:43:15Z day: '28' extern: 1 intvolume: ' 2' month: '09' page: 213 - 284 publication: Techniques in Microscopy for Biomedical Applications publication_status: published publisher: World Scientific Publishing publist_id: '2998' quality_controlled: 0 status: public title: Atomic force microscopy type: book_chapter volume: 2 year: '2006' ... --- _id: '3413' abstract: - lang: eng text: |- Despite their crucial importance for cellular function, little is known about the folding mechanisms of membrane proteins. Recently details of the folding energy landscape were elucidated by atomic force microscope (AFM)-based single molecule force spectroscopy. Upon unfolding and extraction of individual membrane proteins energy barriers in structural elements such as loops and helices were mapped and quantified with the precision of a few amino acids. Here we report on the next logical step: controlled refolding of single proteins into the membrane. First individual bacteriorhodopsin monomers were partially unfolded and extracted from the purple membrane by pulling at the C-terminal end with an AFM tip. Then by gradually lowering the tip, the protein was allowed to refold into the membrane while the folding force was recorded. We discovered that upon refolding certain helices are pulled into the membraneagainst a sizable externalforce of several tens of picoNewton. From the mechanical work, which the helix performs on the AFM cantilever, we derive an upper limit for the Gibbs free folding energy. Subsequent unfolding allowed us to analyze the pattern of unfolding barriers and corroborate that the protein had refolded into the native state. author: - first_name: Max full_name: Kessler, Max last_name: Kessler - first_name: Kay full_name: Gottschalk, Kay E last_name: Gottschalk - first_name: Harald L full_name: Harald Janovjak id: 33BA6C30-F248-11E8-B48F-1D18A9856A87 last_name: Janovjak orcid: 0000-0002-8023-9315 - first_name: Daniel full_name: Mueller, Daniel J last_name: Mueller - first_name: Hermann full_name: Gaub, Hermann last_name: Gaub citation: ama: Kessler M, Gottschalk K, Janovjak HL, Mueller D, Gaub H. Bacteriorhodopsin folds into the membrane against an external force. Journal of Molecular Biology. 2006;357(2):644-654. doi:10.1016/j.jmb.2005.12.065 apa: Kessler, M., Gottschalk, K., Janovjak, H. L., Mueller, D., & Gaub, H. (2006). Bacteriorhodopsin folds into the membrane against an external force. Journal of Molecular Biology. Elsevier. https://doi.org/10.1016/j.jmb.2005.12.065 chicago: Kessler, Max, Kay Gottschalk, Harald L Janovjak, Daniel Mueller, and Hermann Gaub. “Bacteriorhodopsin Folds into the Membrane against an External Force.” Journal of Molecular Biology. Elsevier, 2006. https://doi.org/10.1016/j.jmb.2005.12.065. ieee: M. Kessler, K. Gottschalk, H. L. Janovjak, D. Mueller, and H. Gaub, “Bacteriorhodopsin folds into the membrane against an external force,” Journal of Molecular Biology, vol. 357, no. 2. Elsevier, pp. 644–654, 2006. ista: Kessler M, Gottschalk K, Janovjak HL, Mueller D, Gaub H. 2006. Bacteriorhodopsin folds into the membrane against an external force. Journal of Molecular Biology. 357(2), 644–654. mla: Kessler, Max, et al. “Bacteriorhodopsin Folds into the Membrane against an External Force.” Journal of Molecular Biology, vol. 357, no. 2, Elsevier, 2006, pp. 644–54, doi:10.1016/j.jmb.2005.12.065. short: M. Kessler, K. Gottschalk, H.L. Janovjak, D. Mueller, H. Gaub, Journal of Molecular Biology 357 (2006) 644–654. date_created: 2018-12-11T12:03:12Z date_published: 2006-03-24T00:00:00Z date_updated: 2021-01-12T07:43:18Z day: '24' doi: 10.1016/j.jmb.2005.12.065 extern: 1 intvolume: ' 357' issue: '2' month: '03' page: 644 - 654 publication: Journal of Molecular Biology publication_status: published publisher: Elsevier publist_id: '2988' quality_controlled: 0 status: public title: Bacteriorhodopsin folds into the membrane against an external force type: journal_article volume: 357 year: '2006' ...