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Image-based remapping of spatially-varying material appearance [article]

Alejandro Sztrajman, Jaroslav Krivanek, Alexander Wilkie, Tim Weyrich
2018 arXiv   pre-print
We present a method for automatic translation of material appearance between different BRDF models, which uses an image-based metric for appearance comparison, and that delegates the interaction with the  ...  While it is effective for individual BRDFs, the computational cost does not scale well for spatially-varying BRDFs.  ...  Remapping of Spatially-Varying Materials Spatially-varying materials are commonly defined using texture maps that provide the value of each model parameter across the surface.  ... 
arXiv:1808.06715v1 fatcat:zur7lb7u2vhcroy7scbgrr5vbm

Successful retrieval of competing spatial environments in humans involves hippocampal pattern separation mechanisms

Colin T Kyle, Jared D Stokes, Jennifer S Lieberman, Abdul S Hassan, Arne D Ekstrom
2015 eLife  
It remains unclear, though, how spatial remapping in rodents relates more generally to human memory.  ...  The rodent hippocampus represents different spatial environments distinctly via changes in the pattern of "place cell" firing.  ...  Thus, our findings 393 overall support the importance of pattern completion and separation, particularly in 394 CA3/DG, to spatial remapping and appear less easily reconciled with an inhibition-based 395  ... 
doi:10.7554/elife.10499 pmid:26613414 pmcid:PMC4733045 fatcat:qluk52z4kfaftgkikt7oyuuzny

Oculomotor Remapping of Visual Information to Foveal Retinotopic Cortex

Tomas Knapen, Jascha D. Swisher, Frank Tong, Patrick Cavanagh
2016 Frontiers in Systems Neuroscience  
We used functional magnetic resonance imaging (fMRI) and a phase-encoding design to investigate remapping of spatial patterns of activity towards the fovea/parafovea for saccade targets that were removed  ...  Significantly, the spatial profile of the remapped response matched the orientation and size of the saccade target, and was appropriately scaled to reflect the retinal extent of the stimulus had it been  ...  In a second analysis based on von Mises distribution fits, the mean parameter of the distribution was also allowed to vary.  ... 
doi:10.3389/fnsys.2016.00054 pmid:27445715 pmcid:PMC4915294 fatcat:5qazh6wh6vfobemghqqeqaen4q

A 4D Light-Field Dataset and CNN Architectures for Material Recognition [article]

Ting-Chun Wang, Jun-Yan Zhu, Ebi Hiroaki, Manmohan Chandraker, Alexei A. Efros, Ravi Ramamoorthi
2016 arXiv   pre-print
We introduce a new light-field dataset of materials, and take advantage of the recent success of deep learning to perform material recognition on the 4D light-field.  ...  To the best of our knowledge, this is the first mid-size dataset for light-field images.  ...  The remap image is thus of size (h a × h s ) × (w a × w s ).  ... 
arXiv:1608.06985v1 fatcat:44tq5gwtnre2nalm422r3hcyqi

Photonic Technologies for a Pupil Remapping Interferometer [article]

Peter Tuthill, Nemanja Jovanovic, Sylvestre Lacour, Andrew Lehmann, Martin Ams, Graham Marshall, Jon Lawrence, Michael Withford, Gordon Robertson, Michael Ireland, Benjamin Pope, Paul Stewart
2010 arXiv   pre-print
As a logical extrapolation from several highly successful aperture masking programs underway worldwide, pupil remapping offers the advantage of spatial filtering (with single-mode fibers) and in principle  ...  However in practice, pupil remapping presents a number of difficult technological challenges including injection into the fibers, pathlength matching of the device, and stability and reproducibility of  ...  Redundant pupils will have two or more pairs of sub-apertures contributing to the same spatial frequency in the image plane.  ... 
arXiv:1006.2587v1 fatcat:paogj7toczb3jj5id7vt4pvrjy

Display adaptive 3D content remapping

Belen Masia, Gordon Wetzstein, Carlos Aliaga, Ramesh Raskar, Diego Gutierrez
2013 Computers & graphics  
constraints of each display. 115 116 Generally speaking, content remapping is a standard ap-117 proach to adapt spatial and temporal resolution, contrast, col-118 ors, and sizes of images to a display  ...  of the remapped stereo pairs.  ...  a spatially-varying 290 convolution in each iteration of the optimization procedure.  ... 
doi:10.1016/j.cag.2013.06.004 fatcat:6yn34hyfrzgyhnltkb5vwr7rou

A 4D Light-Field Dataset and CNN Architectures for Material Recognition [chapter]

Ting-Chun Wang, Jun-Yan Zhu, Ebi Hiroaki, Manmohan Chandraker, Alexei A. Efros, Ravi Ramamoorthi
2016 Lecture Notes in Computer Science  
We introduce a new light-field dataset of materials, and take advantage of the recent success of deep learning to perform material recognition on the 4D light-field.  ...  To the best of our knowledge, this is the first mid-size dataset for light-field images.  ...  The remap image is thus of size (h a × h s ) × (w a × w s ).  ... 
doi:10.1007/978-3-319-46487-9_8 fatcat:e2kwcsvasbcadmumyhfbhgrxbu

Prism adaptation alters spatial remapping in healthy individuals: Evidence from double-step saccades

Janet H. Bultitude, Stefan Van der Stigchel, Tanja C.W. Nijboer
2013 Cortex  
This process, called spatial remapping, enables the construction of a stable representation of our visual environment despite constantly changing retinal images.  ...  Because of the influence of prism adaptation on parietal functions, the present research investigates whether prism adaptation alters spatial remapping in healthy individuals.  ...  After a time that varied randomly between 1500 msec and 2500 msec, the fixation cross disappeared and two .72 circular targets appeared sequentially for 140 msec (T1) and 80 msec (T2), based on the design  ... 
doi:10.1016/j.cortex.2012.01.008 pmid:22386659 fatcat:4eyib6quc5dx7goc22n5gbmsba

Vibro-Injection Pile Installation in Sand: Part II—Numerical and Experimental Investigation [chapter]

S. A. Savidis, D. Aubram, F. Rackwitz
2015 Holistic Simulation of Geotechnical Installation Processes  
In Part 1 of this series of papers a macroscopic two-equation (two-field) reduced model for the mechanics of the multi-material flow associated with vibro-injection pile installation in saturated sand  ...  MMALE avoids the disadvantages of the classical approaches in computational continuum mechanics concerning large deformations and evolving material interfaces.  ...  validation of the computational models through back-calculation of selected experimental model tests.  ... 
doi:10.1007/978-3-319-18170-7_6 fatcat:mqrwx5s4xzcerakpz2wckmqvv4

Dynamic, object-based remapping of visual features in trans-saccadic perception

D. Melcher
2008 Journal of Vision  
The overall pattern of results is consistent with the theory of object-based remapping for salient stimuli.  ...  Here we examined two possible models of trans-saccadic remapping of visual features: (1) spatiotopic coordinates that remain constant across saccades or (2) an object-based remapping in retinal coordinates  ...  To test the limits of remapping, the speed and predictability of the path of the moving disk was varied in a new experiment.  ... 
doi:10.1167/8.14.2 pmid:19146303 fatcat:4x4tdtkccfcdheehopmked4l4y

Two-level joint local laplacian texture filtering

Hui Du, Xiaogang Jin, Philip J. Willis
2015 The Visual Computer  
We compare our method with the state-of-the-art methods to demonstrate its improvements, and apply this filter to a variety of image editing applications.  ...  Extracting the structure component from an image with textures is a challenging problem in image processing.  ...  -An interpolation-based scheme of texture filtering: We further find that the unnormalized joint bilateral texture filter is equivalent to a spatially varying blending between the input image and the output  ... 
doi:10.1007/s00371-015-1138-3 fatcat:3d7jmk7fszdwpjqjwo3ifwk7ua

Material and shape perception based on two types of intensity gradient information

Masataka Sawayama, Shin'ya Nishida, Wolfgang Einhäuser
2018 PLoS Computational Biology  
appearance but not the shape of an object.  ...  Here we propose that the human visual system uses different aspects of object images to separately estimate the contributions of the material and shape.  ...  widely used to edit the material appearance of a surface image [1, 3, 6] .  ... 
doi:10.1371/journal.pcbi.1006061 pmid:29702644 pmcid:PMC5963816 fatcat:utelqblycbgvzf4bi6hmgxwktm

Transsaccadic transfer of distortion adaptation in a natural environment

Selam W. Habtegiorgis, Katharina Rifai, Siegfried Wahl
2018 Journal of Vision  
Spatially varying distortions in optical elements-for instance prisms and progressive power lensesmodulate the visual world disparately in different visual areas.  ...  Adaptation to skew distortion of natural-image content was tested at retinotopic and spatiotopic locations after a saccade was executed between adaptation and test phases.  ...  Acknowledgments We acknowledge support by Deutsche Forschungsgemeinschaft and Open Access Publishing Fund of University of Tübingen. Funding received  ... 
doi:10.1167/18.1.13 pmid:29362806 fatcat:anlyute2i5gsllf5rvg4bvqaiy

Remapping in cerebral and cerebellar cortices is not restricted by somatotopy

Avital Hahamy, Tamar R. Makin
2019 Journal of Neuroscience  
Since these three sensorimotor terminals (cerebellum, cerebrum, putamen) contain different somatotopic layouts, the parallel remapping they undergo demonstrates that the mere spatial layout of body-part  ...  The native brain regions of these body parts have varying levels of overlap with the hand regions of the cerebral cortex and cerebellum, and do not necessarily neighbor the hand regions.  ...  would appear as remapping that is 615 independent of the cerebral/cerebellar somatotopic layouts.  ... 
doi:10.1523/jneurosci.2599-18.2019 pmid:31611305 pmcid:PMC6867820 fatcat:xnpnca7hhzagvi3lmloze4xz2u

Context dependence of receptive field remapping in superior colliculus

Jan Churan, Daniel Guitton, Christopher C. Pack
2011 Journal of Neurophysiology  
This suggests that the brain has a mechanism for maintaining perceptual stability, based either on the spatial relationships among visible objects or internal copies of its own motor commands.  ...  Remapping occurs when a single neuron responds to visual stimuli placed presaccadically in the spatial location that will be occupied by its receptive field after the completion of a saccade.  ...  GRANTS This work was supported by a Canadian Institutes of Health Research grant to D.  ... 
doi:10.1152/jn.00288.2011 pmid:21753030 fatcat:fdyrarl5kbahvgav7k76akuvmu
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