Papers

See also the Research Summary.

• J. Stewart and M. Billinghurst, "A wearable navigation display can improve attentiveness to the surgical field", IPCAI 2016 special issue of International Journal of Computer Assisted Radiology and Surgery, 11(6), 1193-1200, 2016.
• S. Sebastyan, M. Kunz , J. Stewart, D. Bardana, "Image-guided techniques improve accuracy of mosaic arthroplasty", International Journal of Computer Assisted Radiology and Surgery, 11(2), 261-269, 2016.
• P. Kennelly and J. Stewart, "Relief Shading with Sky Models", chapter in Mountain Cartography: 16 Years ICA Commission on Mountain Cartography (1999-2015) (Karel Kris, Editor). Wiener Schriften zur Geographie und Kartographie (Band 21); Institut für Geographie und Regionalforschung, Universität Wien, Kartographie und Geoinformation, Vienna, Austria. pp 69-76, 2015.
• T. Vaughan, M. Slonetsky, K. Birk, D. Bardana, J. Stewart, "Generating patient-specific 3D models using a tracked pointing device", International Journal of Computer Assisted Radiology and Surgery, abstract, 2 pages, 2015.
• A. Simpson, B. Ma, E. Vasarhelyi, D. Borschneck, R. Ellis, J. Stewart, "Computation and Visualization of Uncertainty in Surgical Navigation", International Journal of Medical Robotics and Computer Assisted Surgery, 10(3):332-43, 2014.
• P. Kennelly and J. Stewart, "General Sky Models for Illuminating Terrains", International Journal of Geographical Information Science, 28(2):383-406, 2014.
• M. Kunz, J. Stewart, J.F. Rudan, V. Kratky, "Faster intraoperative localization of posterior orbital tumours using a patient-specific instrument guide", Computer Assisted Radiology and Surgery, poster, 2013. Best Poster Award
• M. Kunz, J. Stewart, D. Bardana, "Image-guided Osteochondral Autologous Autografting of the Ankle", Computer-Assisted Orthopaedic Surgery, poster, 2013.
• M. Kunz, S. Devlin, M. Hurtig, S. Waldman, J. Rudan, D. Bardana, J. Stewart, "Image-Guided Techniques Improve the Short-term Outcome of Autologous Osteochondral Cartilage Repair Surgeries - An Animal Trial", Cartilage, 4(2):153-164, 2013.
• D. Bardana, J. Rudan, M. Kunz, M. Hurtig, S. Waldman, J. Stewart, "Computer assisted mosaic arthroplasty (mosaicplasty)". In: A New Coalition for a Challenging Battlefield: Military and Veteran Health Research, S Belanger, A Aiken (Eds) Canadian Defence Academy Press, Canada, ISBN 978-1-1002-1361-3, Chapter 12, pages 191-198, 2012.
• M. Kunz, S. Waldman, J. Rudan, D. Bardana, J. Stewart, "Computer Assisted Mosaic Arthroplasty Using Patient-Specific Instrument Guides", Knee Surgery, Sports Traumatology, Arthroscopy, 20(5):857-861, 2012.
• J. Inoue, M. Kunz, M. Hurtig, S. Waldman, J. Stewart, "Automated Planning of Computer Assisted Mosaic Arthroplasty", Medical Image Computing and Computer Assisted Intervention (MICCAI), pp 265-272, 2011.
• D. Onceanu and J. Stewart, "Direct Surgeon Control of the Computer in the Operating Room", Medical Image Computing and Computer Assisted Intervention (MICCAI), pp 121-128, 2011.
• J. Li, D. Bardana, J. Stewart, "Augmented Virtuality for Arthroscopic Knee Surgery", Medical Image Computing and Computer Assisted Intervention (MICCAI), pp 185-192, 2011.
• A. Simpson, B. Ma, R. Ellis, J. Stewart, M. Miga, "Uncertainty propagation and analysis of image-guided surgery", SPIE Medical Imaging, pp 79640H-79640H-7, 2011.
• R.H. Gong, J. Stewart, P. Abolmaesumi, "Multiple-Object 2D-3D Registration for Non-invasive Pose Identification of Fracture Fragments", IEEE Transactions on Biomedical Engineering, 58(6):1592-1601, June 2011.
• J. Stewart and P. Kennelly, "Illuminated Choropleth Maps", Annals of the Association of American Geographers, 100(3):513-534, 2010.
• M. Kunz, M. Hurtig, S. Waldman, S. Devlin, J. Rudan, D. Bardana, J. Stewart, "Image-guided surgical techniques for cartilage repair - an animal trial", World Congress of the International Cartilage Repair Society (ICRS), p 190, podium presentation, 2010.
• J. Inoue, M. Kunz, S. Waldman, M. Hurtig, J. Stewart, "Automated planning of computer-guided mosaic arthroplasty", World Congress of the International Cartilage Repair Society (ICRS), p 220, poster, 2010.
• S. Avni, J. Stewart, "Frontier Sets in Large Terrains", Graphics Interface, pp 169-176, 2010.
• R.H. Gong, J. Stewart, P. Abolmaesumi, "A New Representation of Intensity Atlas for GPU-Accelerated Instance Generation", International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), pp 4399-4402, 2010.
• E. Vasarhelyi, A. Simpson, D. Borschneck, B. Ma, J. Stewart, R. Ellis, "A comparison study of two-dimensional and three-dimensional navigation methods", Computer Assisted Orthopaedic Surgery (CAOS), pp 561-563, 2010.
• A. Simpson, E. Vasarheyli, D. Borschneck, R. Ellis, B. Ma, J. Stewart, "A surgical performance comparison of an uncertainty visualization method with application to pedicle screw insertion", Computer Assisted Orthopaedic Surgery (CAOS), podium presentation, pp 220-223, 2010.
• M. Kunz, S. Devlin, R.H. Gong, J. Inoue, S. Waldman, M. Hurtig, P. Abolmaesumi, J. Stewart, "Prediction of the Repair Surface over Cartilage Defects: A Comparison of Three Methods in a Sheep Model", Medical Image Computing and Computer Assisted Intervention (MICCAI), pp 75-82, 2009.
• K. Kassil, J. Stewart, "Evaluation of a Tool-Mounted Guidance Display for Computer-Assisted Surgery", ACM International Conference on Human Factors in Computing Systems (CHI), pp 1275-1278, 2009.
• M. Kunz, S. Devlin, M. Hurtig, S. Waldman, J. Stewart, "Comparison of two CT-based intraoperative navigation systems for moasic arthroplasty", International Society for Computer Assisted Orthopaedic Surgery, pp 43-46, 2009.
• M. Kunz, S. Devlin, J.F. Rudan, S.D. Waldman, J. Stewart, M. Hurtig, "Computer-assisted planning for mosaic arthroplasty", Computer Assisted Radiology and Surgery, S102-S103, 2009.
• R.H. Gong, J. Stewart, P. Abolmaesumi, "Reduction of multi-fragment fractures of the distal radius using atlas-based 2D/3D registration", Medical Imaging 2009: Visualization, Image-Guided Procedures, and Modeling. Proceedings of the SPIE, Volume 7261, pp. 726137-1 - 726137-9, 2009.
• M. Hurtig, M. Kunz, S. Devlin, J. Rudan, J. Stewart, D. Bardana, S. Waldman, "Individualized rapid prototyped guides for optimization of mosaic arthroplasty", International Cartilage Repair Society, Vol 8, page 265, 2009.
• R.-H. Gong, J. Stewart, P. Abolmaesumi, "Tracking of Bone Fragments using 2D-3D Registration for Reduction of Complex Bone Fractures", Canadian Orthopaedic Research Society, abstract, 2009.
• J Inoue and J Stewart, "Multiresolution Sphere Packing Tree: A Hierarchical Multiresolution 3D Data Structure", ACM Solid and Physical Modeling Symposium, pp 367-373, 2008.
• M. Kunz, J. Rudan, D. Bardana, J. Stewart, S. Waldman, R. Ellis, "Computer-Assisted Mosaicplasty", Computer Assisted Orthopaedic Surgery, pp 358-360, 2008.
• M Guenette and J Stewart, "Triangulation of Hierarchical Hexagon Meshes", ACM Solid and Physical Modeling Symposium, pp 307-313, 2008.
• K. Grad, N. Graham and J. Stewart, Effective Use of the Periphery in Game Displays, Proceedings of FuturePlay 2007, pp. 69-76, 2007.
• B. Ma, J. Stewart, D. Pichora, R. Ellis, P. Abolmaesumi, "2D/3D registration of multiple bones", IEEE International Conference on Engineering in Medicine and Biology, pp. 860-863, 2007.
• A. Simpson, B. Ma, E. Chen, R. Ellis, J. Stewart, "Computation and validation of intraoperative camera uncertainty", IEEE International Conference on Engineering in Medicine and Biology, pp. 479-482, 2007.
• A. Simpson, B. Ma, E. Chen, R. Ellis, and J. Stewart. "A Registration Uncertainty Visualization Method", Computer-Assisted Orthopaedic Surgery, pp 595-598, 2007.
• E. Smith, V. Kratky, R. Sellens, J. Stewart, "Orbital GPS: Globe positioning system (abstract)", Canadian Ophthalmological Society Annual Meeting, page 26, 2007.
• M. Kersten, J. Stewart, N. Troje, R. Ellis, "Enhancing Depth Perception in Translucent Volumes", IEEE Transactions on Visualization and Computer Graphics, 12(5):1117-1124, 2006.
• P. Kennelley and J. Stewart, "A Uniform Sky Illumination Model to Enhance Shading of Terrain and Urban Areas", Cartography and Geographic Information Science, 33(1):21-36, 2006.
• A. Simpson, B. Ma, E. Chen, R. Ellis, J. Stewart, "Using Registration Uncertainty Visualization in a User Study of a Simple Surgical Task", Medical Image Computing and Computer Assisted Intervention (MICCAI), pp 397-404, 2006.
• R. Gong, J. Stewart, P. Abolmaesumi, "A New Method for CT to Fluoroscopes Registration Based on Unscented Kalman Filter", Medical Image Computing and Computer Assisted Intervention (MICCAI), pp 891-898, 2006.
• R. Gong, P. Abolmaesumi, J. Stewart, "A robust technique for 2D-3D registration," Proceedings of IEEE Engineering in Medicine and Biology (EMBC), pp 1433-1436, 2006.
• R. Jalal, B. Ma, S. Chen, R.H. Gong, J. Stewart, P. Abolmaesumi, H.J. Grant, and D. Pichora, "A Comparison of Three Radiographic Indices on Surface Mesh Models and Digitally Reconstructed Radiographs of the Distal Radius", 52nd Annual Meeting of the Orthopaedic Research Society, pp 243-245, 2006. Also presented at ORS 2006.
• J. Inoue, M. Kersten, B. Ma, J. Stewart, J. Rudan, R. Ellis, "Fast Assessment of Acetabular Coverage using Stereoscopic Volume Rendering", Medicine Meets Virtual Reality 14, pp 225-227, 2006.
• C. Bethune and J. Stewart, "Adaptive Slice Geometry for Hardware-Assisted Volume Rendering", Journal of Graphics Tools, 10(1):55-70, 2005.
• C. Bethune and J. Stewart, "Accelerated Computation of Digitally Reconstructed Radiographs", Computer Assisted Radiology and Surgery, pp 98-103, 2005.
• S. Richards and J. Stewart, "A Natural and Intuitive Planner for 3D Orthopaedic Surgery", Computer Assisted Orthopaedic Surgery, pp 378-379, 2005.
• J. Shell, R. Vertegaal, D. Cheng, A. Skaburskis, C. Sohn, A. J. Stewart, O. Aoudeh, C. Dickie "ECSGlasses and EyePliances: Using Attention to Open Sociable Windows of Interaction", Eye Tracking Research & Applications Symposium, pp 93-100, 2004.
• A. J. Stewart, "Vicinity Shading for Enhanced Perception of Volumetric Data", IEEE Visualization, pp 355-362, October 2003.
• K. Xu, A. J. Stewart, and E. Fiume, "Constraint-Based Automatic Placement for Scene Composition", Graphics Interface, pp 25-34, May 2002.
• A. J. Stewart, "Tunneling for Triangle Strips in Continuous Level-of-Detail Meshes", Graphics Interface, pp 91-100, June 2001.
• T. Karkanis and A. J. Stewart, "Curvature-Dependent Triangulation of Implicit Surfaces," IEEE Computer Graphics and Applications, 21(2):60-69, 2001.
• C. Trendall and A. J. Stewart, "General calculations using graphics hardware, with applications to interactive caustics," Eurographics Rendering Workshop, June 2000.
• A. J. Stewart, " Computing visibility from folded surfaces," Computers and Graphics, 23(5):693-702, 1999.
• M. van de Panne and A. J. Stewart, "Effective compression techniques for precomputed visibility," Eurographics Rendering Workshop, pp 305-316, June 1999.
• A. J. Stewart, " Fast horizon computation at all points of a terrain with visibility and shading applications," IEEE Transactions on Visualization and Computer Graphics, 4(1):82-93, 1998.
• A. J. Stewart and T. Karkanis, "Computing the approximate visibility map, with applications to form factors and discontinuity meshing," Eurographics Rendering Workshop, pp 57-68, June 1998.
• A. J. Stewart and M. S. Langer, "Towards accurate recovery of shape from shading under diffuse lighting," IEEE Transactions on Pattern Analysis and Machine Intelligence, 19(9):1020-1025, 1997.
• A. J. Stewart, " Hierarchical visibility in terrains," Eurographics Rendering Workshop, pp 217-228, June 1997.
• S. Ghali and A. J. Stewart, " Incremental update of the visibility map as seen by a moving viewpoint in two dimensions," Eurographics Workshop on Animation and Simulation, pp 1-11, August 1996.
• A. J. Stewart and M. S. Langer, " Towards accurate recovery of shape from shading under diffuse lighting," Proceedings IEEE Conference on Computer Vision and Pattern Recognition, pp 411-418, June 1996.
• S. Ghali and A. J. Stewart, " A complete treatment of D1 discontinuities in a discontinuity mesh," Graphics Interface, pp 122-131, May 1996.
• A. J. Stewart and S. Ghali, " Fast computation of shadow boundaries using spatial coherence and backprojections," Computer Graphics (SIGGRAPH), pp 231-238, 1994.
• A. J. Stewart, " Local robustness and its application to polyhedral intersection," International Journal of Computational Geometry and Applications, 4(1):87-118, 1994.
• A. J. Stewart and S. Ghali, "An output sensitive algorithm for the computation of shadow boundaries," Fifth Canadian Conference on Computational Geometry, pp 291-296, August 1993.
• A. J. Stewart and J. F. Cremer, "Animation of 3D human locomotion: climbing stairs and descending stairs," Eurographics Workshop on Animation and Simulation, pp 152-168, September 1992.
• A. J. Stewart and J. F. Cremer, "Beyond keyframing: an algorithmic approach to animation" (some figures missing in the electronic version), Graphics Interface, pp 273-281, 1992.
• A. J. Stewart, "Robust point location in approximate polygons (extended abstract)," Canadian Conference on Computational Geometry, pp 179-182, 1991
• A. J. Stewart and J. F. Cremer, "Algorithmic control of walking," IEEE International Conference on Robotics and Automation, pp 1598-1603, 1989.
• J. F. Cremer and A. J. Stewart, "The architecture of Newton, a general purpose dynamics simulator," IEEE International Conference on Robotics and Automation, pp 1806-1811, 1989.
• J. F. Cremer and A. J. Stewart, "Using the Newton simulation system as a testbed for control," Third IEEE International Symposium on Intelligent Control, pp 399-404, 1988

Reports and Videos

• P Kennelly, J Stewart, "Illumination Models for Cartographic Displays", Association of American Geographers Annual Conference, abstract and presentation, 2007.
• R Gong, P Abolmaesumi, J Stewart, "2D-3D Registration with Unscented Kalman Filter and Consumer-Grade Graphics Hardware", Canadian Student Conference on Biomedical Computing, abstract, 2007.
• A Simpson, B Ma, E Chen, R Ellis, and J Stewart. "Registration Uncertainty Visualization", Canadian Student Conference on Biomedical Computing, abstract and presentation, 2007.
• J. Stewart and P. Kennelly, "Shading Choropleth Maps for Three Dimensional Effect", North American Cartographic Information Society Annual Conference, Oral presentation, October 2005.
• P. Kennelly and J. Stewart, "Cloudy Day Illumination of LIDAR Data", North American Cartographic Information Society Annual Conference, Oral presentation, 2004.
• M. Guenette and J. Stewart, "Triangulation of Hierarchical Hexagon Meshes", International Conference on Discrete Global Grids, Oral presentation, 2004.
• S. Ghali and A. J. Stewart, "Maintenance of the Set of Segments Visible from a Moving Viewpoint in Two Dimensions" Proceedings of the 12th Annual ACM Symposium on Computational Geometry, pp V3-V4, May 1996.
• A. J. Stewart, " Fast horizon computation for accurate terrain rendering," Technical Report 349, Department of Computer Science, University of Toronto, June 1996.
• A. J. Stewart, " The theory and practice of robust geometric computation, or, How to build robust solid modelers," Ph.D. thesis, Cornell University, also in Cornell Computer Science Technical Report 91-1229, 1991.
• A. J. Stewart, "Robust point location in approximate polygons," Cornell Computer Science Technical Report 91-1208, 1991.

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