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Multichannel Shape From Shading Techniques For Reconstruction Of Specular Surfaces

Günther Balschbach, Jochen Klinke, Bernd Jähne
1997 Zenodo  
This paper describes a shape from shading technique for the reconstruction of specular surfaces based on refraction and color illumination or multiple pulsed light sources.  ...  The technique is used to retrieve the small-scale shape of wave-undulated water surfaces in the laboratory and the field.  ...  Acknowledgments Financial support for this research by the German Science Foundation (Deutsche Forschungsgemeinschaft, DFG) through the Forschergruppe "Bildfolgenanalyse zum Studium dynamischer Prozesse  ... 
doi:10.5281/zenodo.16452 fatcat:tyy3douoknhd3os2z3qrd5n66m

Linear Differential Constraints for Photo-Polarimetric Height Estimation

Silvia Tozza, William A. P. Smith, Dizhong Zhu, Ravi Ramamoorthi, Edwin R. Hancock
2017 2017 IEEE International Conference on Computer Vision (ICCV)  
Our method uses the image ratios technique to combine shading and polarisation information in order to directly reconstruct surface height, without first computing surface normal vectors.  ...  We also introduce a new method for estimating a polarisation image from multichannel data and, finally, we show it is possible to estimate the illumination directions in a two source setup, extending the  ...  We assume that pixels have been labelled as diffuse or specular dominant and restrict consideration to diffuse shading.  ... 
doi:10.1109/iccv.2017.250 dblp:conf/iccv/TozzaSZRH17 fatcat:sn4exwjsqncfnitss5xjhzufsu

Linear Differential Constraints for Photo-polarimetric Height Estimation [article]

Silvia Tozza, William A. P. Smith, Dizhong Zhu, Ravi Ramamoorthi and Edwin R. Hancock
2017 arXiv   pre-print
Our method uses the image ratios technique to combine shading and polarisation information in order to directly reconstruct surface height, without first computing surface normal vectors.  ...  We also introduce a new method for estimating a polarisation image from multichannel data and, finally, we show it is possible to estimate the illumination directions in a two source setup, extending the  ...  Acknowledgements This work was supported mainly by the "GNCS -INdAM", in part by ONR grant N000141512013 and the UC San Diego Center for Visual Computing. W.  ... 
arXiv:1708.07718v1 fatcat:mlmxdppplnbefaxw73h2gdh76a

Page 6541 of Mathematical Reviews Vol. , Issue 2000i [page]

2000 Mathematical Reviews  
Lopez, Felipe Lumbreras and Joan Serrat, Creaseness from level set ex- trinsic curvature (156-169); Giinther Balschbach, Jochen Klinke and Bernd Jahne, Multichannel shape from shading techniques for moving  ...  specular surfaces (170-184); Naoufel Werghi, Robert Fisher, Craig Robertson and Anthony Ashbrook, Modelling ob- jects having quadric surfaces incorporating geometric constraints (185-201); N.  ... 

The Role Of Active Vision In Exploring Growth, Transport, And Exchange Processes

Bernd Jähne, Horst Haußecker, Frank Hering, Günther Balschbach, Jochen Klinke, Martin Lell, Dominik Schmundt, M Schultz, Ulrich Schurr, Mark Stitt, Ullrich Platt
1996 Zenodo  
The Forschergruppe includes researchers from the Interdisciplinary Center for Scientific Computing, the Botany Institute, and the Institute for Environmental Physics.  ...  , 3-D reconstruction, and multichannel image fusion.  ...  Acknowledgments We gratefully acknowledge financial support for this research by the German Science Foundation (Forschergruppe "Bildfolgenanalyse zum Studium dynamischer Vorgänge", Ja 395/6-1) and in part  ... 
doi:10.5281/zenodo.16447 fatcat:msczlv3q5ngytcphmcvpttlkvu

Real-time segmentation of surgical instruments inside the abdominal cavity using a joint hue saturation color feature

C. Doignon, P. Graebling, M. de Mathelin
2005 Real-time imaging  
With this environment, the moving background due to the breathing motion, the non-uniform and time-varying lighting conditions and the presence of specularities are the main difficulties to overcome.  ...  and specularities.  ...  Marescaux, Leroy and Soler for their advices, as well as for the use of their facilities.  ... 
doi:10.1016/j.rti.2005.06.008 fatcat:xsqbqx462ng5zbug6r6gtzbvyu

Practical dynamic facial appearance modeling and acquisition

Paulo Gotardo, Jérémy Riviere, Derek Bradley, Abhijeet Ghosh, Thabo Beeler
2018 ACM Transactions on Graphics  
ACKNOWLEDGMENTS We wish to thank our 3D artist Maurizio Nitti for his help with face rendering for the relighting experiments.  ...  We also thank Virginia Ramp, Anurag Vempati and Tejaswi Digumarti for posing as capture subjects.  ...  From the per-frame normal maps (col. 8), diffuse surface shading (col. 5) is computed using a Lambertian BRDF modulated by diffuse ambient occlusion, and specular surface shading (col. 6) is computed using  ... 
doi:10.1145/3272127.3275073 fatcat:52mve4fqnfaifkfts7pv3rpbze

Modeling Real Objects Using Video See-Through Augmented Reality

Joohi Lee, Gentaro Hirota, Andrei State
2002 Presence - Teleoperators and Virtual Environments  
We use a tracked probe to sample the objects' geometries, and we acquire video images from the head-mounted cameras to capture textures.  ...  This paper presents an interactive "what-you-see-is-what-you-get" (WYSIWYG) method for creating textured 3-D models of real objects using video see-through augmented reality.  ...  ASC-8920219: "Science and Technology Center for Computer Graphics and Scientific Visualization."  ... 
doi:10.1162/1054746021470595 fatcat:e7c4k44mdzfxfitv2jlw3da6w4

Editorial advisory board members [chapter]

2008 Progress in Heterocyclic Chemistry  
Journal of WSCG An international journal of algorithms, data structures and techniques for computer graphics and visualization, surface meshing and modeling, global illumination, computer vision, image  ...  ACKNOWLEDGEMENTS Many thanks the anonymous reviewers for their feedback. We are grateful to Maik Schulze and Holger Theisel for providing the code for the generation of stream surfaces.  ...  This research has been supported by GAUK 309611 research grants from the Grant Agency of Charles University in Prague and MSM 0021620843 from the Ministry of Education, Youth and Sports of the Czech Republic  ... 
doi:10.1016/s0959-6380(08)80002-5 fatcat:iqgyohmpjrdhfdj3d6o6vkvkuu

Radar mapping of Isunnguata Sermia, Greenland

K. Jezek, X. Wu, J. Paden, C. Leuschen
2013 Journal of Glaciology  
As might be expected for this land-terminating, relatively slow-moving glacier, the subglacial and proglacial topography is similar, suggesting the erosional processes acting on the modern glacier bed  ...  Using derived surface and basal topography maps, we find that driving stress and measured and modeled surface velocity comparisons indicate that basal sliding is an important component of the glacier motion  ...  The University of Kansas also received support from the US National Science Foundation through the Center for Remote Sensing of Ice Sheets.  ... 
doi:10.3189/2013jog12j248 fatcat:hntkqk6o6bhqdk5b2rgxuv72b4

GPU-accelerated high-quality hidden surface removal

Daniel Wexler, Larry Gritz, Eric Enderton, Jonathan Rice
2005 Proceedings of the ACM SIGGRAPH/EUROGRAPHICS conference on Graphics hardware - HWWS '05  
At high spatial sampling rates, our implementation is substantially faster than a CPU-only renderer for typical scenes.  ...  We present a GPU-based hidden-surface algorithm that implements all these features. The algorithm is Reyeslike but uses regular sampling and multiple passes.  ...  Examples include surface normals or separate specular and diffuse images. CPU-based renderers typically maintain a hierarchical zbuffer for occlusion testing [GK93] .  ... 
doi:10.1145/1071866.1071868 fatcat:sz4mqpkytrfg5fpfddzkvbzztm

Two-channel point-contact tunneling theory of superconductors

Mikael Fogelström, Matthias J. Graf, V. A. Sidorov, Xin Lu, E. D. Bauer, J. D. Thompson
2014 Physical Review B  
A possibility is that the shape of the high-pressure Andreev signal is affected by the proximity of a line of quantum critical points that extends from 1.75 to 2.3 GPa, which is not accounted for in our  ...  Tunneling of electrons can occur via localized surface states or directly, resulting in a Fano resonance in the differential conductance G=dI/dV.  ...  Movshovich for stimulating discussions. M.  ... 
doi:10.1103/physrevb.90.104512 fatcat:zie7qnoekbgfzd2m2acuf2j5g4

Polyp Detection and Segmentation from Video Capsule Endoscopy: A Review

V. Prasath
2016 Journal of Imaging  
Video capsule endoscopy (VCE) is used widely nowadays for visualizing the gastrointestinal (GI) tract.  ...  We review different polyp detection approaches for VCE imagery and provide systematic analysis with challenges faced by standard image processing and computer vision methods.  ...  [30] used an active contours without edges method for identifying mucosal surface in conjunction with shape from shading technique (see also [65] ). Eskandari et al.  ... 
doi:10.3390/jimaging3010001 fatcat:ifkngz7v7rceteeihh3vhpw5uy

Integrated volume visualization of functional image data and anatomical surfaces using normal fusion

Rik Stokking, Karel J. Zuiderveld, Max A. Viergever
2001 Human Brain Mapping  
A generic method, called normal fusion, for integrated three-dimensional (3D) visualization of functional data with surfaces extracted from anatomical image data is described.  ...  The first part of the normal fusion method derives quantitative values from functional input data by sampling the latter along a path determined by the (inward) normal of a surface extracted from anatomical  ...  This process relies on shading techniques that model light absorption, reflection, and transmission along surfaces.  ... 
doi:10.1002/1097-0193(200104)12:4<203::aid-hbm1016>3.3.co;2-o pmid:11241872 fatcat:wpa4mps3ynctfj4gfuiovx6ezu

Integrated volume visualization of functional image data and anatomical surfaces using normal fusion

Rik Stokking, Karel J. Zuiderveld, Max A. Viergever
2001 Human Brain Mapping  
A generic method, called normal fusion, for integrated three-dimensional (3D) visualization of functional data with surfaces extracted from anatomical image data is described.  ...  The first part of the normal fusion method derives quantitative values from functional input data by sampling the latter along a path determined by the (inward) normal of a surface extracted from anatomical  ...  This process relies on shading techniques that model light absorption, reflection, and transmission along surfaces.  ... 
doi:10.1002/1097-0193(200104)12:4<203::aid-hbm1016>3.0.co;2-x pmid:11241872 fatcat:i2q3eflogvecxmfduv4ahkzbju
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