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Discerning nonrigid 3D shapes from motion cues
2011
Proceedings of the National Academy of Sciences of the United States of America
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The empirical and computational results of this study argue against the use of rigidity assumptions in extracting 3D shape from motion and for the primacy of motion deformations computed from motion shears ...
Surprisingly, the abilities of observers to correctly infer nonrigid volumetric shapes from motion cues have not been measured, and structure from motion models predominantly use variants of rigidity assumptions ...
This work was supported by National Eye Institute Grants EY07556 and EY13312 (to Q.Z.). ...
doi:10.1073/pnas.1016211108
pmid:21205884
pmcid:PMC3029717
fatcat:dgdf2i3rk5egffak4w25bv7nmu
Optimal shape and motion of undulatory swimming organisms
2012
Proceedings of the Royal Society of London. Biological Sciences
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Undulatory swimming animals exhibit diverse ranges of body shapes and motion patterns and are often considered as having superior locomotory performance. ...
hydrodynamical, structural and novel muscular model. ...
between F musc and neural activity [15] [16] [17] as was done in previous studies [9] [10] [11] [12] . ...
doi:10.1098/rspb.2012.0057
pmid:22456876
pmcid:PMC3385469
fatcat:3oycqnccl5apxn54ifrpfmiwpy
The shape of motion perception: Global pooling of transformational apparent motion
2013
Journal of Vision
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Few studies have, however, systematically examined how TAM relates to conventional low-level motion-energy systems. ...
In TAM, smooth apparent motion is perceived when shapes in certain spatiotemporal arrangements change. It has been argued that TAM relies on a separate high-level form-motion system. ...
Acknowledgments This work was supported by Australian Research Council grants DP130102580 to DRB, DP110104553 to DRB and ME, and DP120102313 to TAWV. ...
doi:10.1167/13.13.20
pmid:24259672
fatcat:bnrj7lkqknhqzleiwbbltrskqy
Sensory memory of structure-from-motion is shape-specific
2013
Attention, Perception & Psychophysics
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Specifically, we generated SFM objects with different threedimensional shapes and presented them in random order and with intervening blank periods. ...
Here, we investigated perceptual priming for the apparent rotation in depth of ambiguous structure-from-motion (SFM) displays. ...
Neural substrates of sensory memory The neural substrates of sensory memory for ambiguous appearance have been studied in several situations. ...
doi:10.3758/s13414-013-0471-8
pmid:23673611
fatcat:475qn5k75bfergwaiqhycsbsfq
Contrasting accounts of direction and shape perception in short-range motion: Counterchange compared with motion energy detection
2014
Attention, Perception & Psychophysics
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Human observers' ability to discriminate motion direction and use coherent motion information to segregate a region of a random cinematogram and determine its shape was tested; they performed better in ...
The further advantage of counterchange, as compared with motion energy, detection for the perception of spatial shape-and depth-from-motion is discussed. ...
Consequently, empirical evidence for asymmetry in motion and shape perception between the same-and inverted-polarity stimuli would indicate that motion perception was not determined solely by motion energy ...
doi:10.3758/s13414-014-0650-2
pmid:24634030
fatcat:k5fja6ocgjckxcygjpdjikzc7m
Global shape coding for motion-defined radial-frequency contours
2005
Vision Research
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But while lowlevel and high-level mechanisms involved in shape-from-motion have been studied extensively, intermediate computational stages remain poorly understood. ...
In the present study, we used motion-defined radial-frequency contours-or motion RFs-to probe intermediate stages involved in the computation of motion-defined shape. ...
Acknowledgments We thank the Natural Sciences and Engineering Research Council of Canada (grant OP227224) and the National Institute of Health (grant EY002158) for their support. ...
doi:10.1016/j.visres.2005.06.033
pmid:16099014
fatcat:274puamutnbf5ld4iytfmaoc2m
Symmetries in stimulus statistics shape the form of visual motion estimators
2011
Proceedings of the National Academy of Sciences of the United States of America
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The estimation of visual motion has long been studied as a paradigmatic neural computation, and multiple models have been advanced to explain behavioral and neural responses to motion signals. ...
of sensory inputs influence perception and shape neural encoding of auditory (1) , somatosensory (2) , and visual stimuli (3) . ...
doi:10.1073/pnas.1015680108
pmid:21768376
pmcid:PMC3150910
fatcat:xnii7dlpx5dxbb2qb3ywwet35a
Creatures great and SMAL: Recovering the shape and motion of animals from video
[article]
2018
arXiv
pre-print
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We present a system to recover the 3D shape and motion of a wide variety of quadrupeds from video. ...
The system is tested on animal videos from several species, and shows accurate reconstructions of 3D shape and pose. ...
Although the dataset is perhaps insufficient in size to train deep neural networks, the variety in animal shape and pose renders it suitable for evaluating quadruped joint prediction methods. ...
arXiv:1811.05804v1
fatcat:palpx4lb3vh3bau7l2ursgicdy
Capturing Humans in Motion: Temporal-Attentive 3D Human Pose and Shape Estimation from Monocular Video
[article]
2022
arXiv
pre-print
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To address this problem, we propose a motion pose and shape network (MPS-Net) to effectively capture humans in motion to estimate accurate and temporally coherent 3D human pose and shape from a video. ...
Learning to capture human motion is essential to 3D human pose and shape estimation from monocular video. ...
In the attention map, red indicates a higher attention value, and blue indicates a lower one. which mainly rely on recurrent neural network (RNN) or convolutional neural network (CNN) to model temporal ...
arXiv:2203.08534v1
fatcat:sp2oxin5trajhfiinraxc3gadq
A comparison of colour, shape, and flash induced illusory line motion
2017
Attention, Perception & Psychophysics
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(ILM; colour ILM and shape ILM, respectively). ...
The results suggest that while colour ILM and shape ILM reflect a common illusion, flash ILM arises for a different reason. ...
is well modelled by that function, can vary study to study. ...
doi:10.3758/s13414-016-1269-2
pmid:28054275
fatcat:cn7x5vq62zantm5gg53dcj35qa
A Shape-Aware Retargeting Approach to Transfer Human Motion and Appearance in Monocular Videos
[article]
2021
arXiv
pre-print
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The formulation leverages the user body shape into the retargeting while considering physical constraints of the motion in 3D and the 2D image domain. ...
Our method is validated in several experiments, comprising publicly available videos of actors with different shapes, motion types, and camera setups. ...
The authors thank CAPES, CNPq, and FAPEMIG for funding this work. We also thank NVIDIA for the donation of a Titan XP GPU used in this research. ...
arXiv:2103.15596v2
fatcat:them7wrlvfchpgy36mtxmfzm2q
Towards a unified perspective of object shape and motion processing in human dorsal cortex
2018
Consciousness and Cognition
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We also highlight the role of dorsal cortex in form-motion interaction and spatiotemporal integration, possible functional relationships between 3-D shape and motion processing, and how these processes ...
In this article, we review evidence for the unique contribution of object areas of dorsal cortex to three-dimensional (3-D) shape representation, the localization of objects in space, and in guiding reaching ...
(grant numbers 1632849 and 1632738). ...
doi:10.1016/j.concog.2018.04.016
pmid:29779844
pmcid:PMC6433144
fatcat:cehhc2vvmvhv3ftrrsea6cbd5y
Articulated deformable structure approach to human motion segmentation and shape recovery from an image sequence
2018
IET Computer Vision
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The aim of this study is to perform motion segmentation and three-dimensional shape recovery of a dynamic human body from an image sequence. ...
Finally, the blend-shape method is applied to model local deformations of each individual subset. ...
of approximately rigid subsets; (b) blend-shape modelling of local deformations, based on physically meaningful shape basis enabling shape-based regularisation; and (c) computationally efficient motion ...
doi:10.1049/iet-cvi.2018.5365
fatcat:bjw3wy6aybbzxg6ly6s4mefobi
Review of the Book "Mind in Motion: How Action Shapes Thought" by Barbara Tversky, Basic Books, New York, 2019
2020
Journal of Intelligent & Fuzzy Systems
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These are interesting questions to study. The most efficient way is combining images and words. ...
This probably explains the empirical success of symmetric triangular membership functions which are indeed characterized by two parameters: center and width, and of a similar 2-parametric family of Gaussian ...
doi:10.3233/jifs-189308
fatcat:2ag2sllrxjfb5db6vc54tmzvcu
Attraction to Motion
2005
PLoS Biology
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But since few scientists have tested these models with empirical data, the question remained whether the models were accurately predicting population fl uctuations and extinction risk. ...
With this new model, researchers can investigate the motion-specifi c features that guide the chicks' behavior and how the brain processes biological motion. ...
doi:10.1371/journal.pbio.0030251
fatcat:slr6oq2j5nap5pstfjhsxc4k2y
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