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Directions of motion fields are hardly ever ambiguous [chapter]

Tomas Brodsky, Cornelia Fermüller, Yiannis Aloimonos
1996 Lecture Notes in Computer Science  
shown that more than two different rigid motions can hardly ever give rise to the same direction of flow at every point on a hemisphere.  ...  Hereafter, for the sake of brevity, we will refer to the motion field also as the flow field or simply flow, and to the direction of the motion field as the directional flow field or simply directional  ...  Equation (36) describes a second order curve on the sphere, which we will call the zero motion contour of the rigid motion (t,w). The zero-motion contour consists of two closed curves on the sphere.  ... 
doi:10.1007/3-540-61123-1_132 fatcat:ddazunpfmrcpfdenupy2a2ztt4

Motion fields are hardly ever ambiguous

Berthold K. P. Horn
1988 International Journal of Computer Vision  
I show here that the class of surfaces leading to ambiguous motion fields is extremely restricted-only certain hyperboloids of one sheet (and some degenerate forms) qualify.  ...  Furthermore, the viewer must be on the surface for it to lead to a potentially ambiguous motion field.  ...  Later, Professor Dean Merchant of Ohio State University pointed out the relevance of the earlier Ph.D. thesis of Arthur Brandenberger [20] on exterior orientation.  ... 
doi:10.1007/bf00127824 fatcat:pdbqswma7jdixkwlj4x6ef2fyi

United we sense, divided we fail: context-driven perception of ambiguous visual stimuli

P. C. Klink, R. J. A. van Wezel, R. van Ee
2012 Philosophical Transactions of the Royal Society of London. Biological Sciences  
The fact that we are hardly ever aware of ambiguous visual input during natural vision must be attributed to the fact that ambiguous stimulation is truly ambiguous only when it is completely isolated from  ...  when their orientations promote grouping [50] and ambiguous apparent motion dot displays share a perceived direction of motion [51] , as do lines ambiguously rotating in depth [52] .  ... 
doi:10.1098/rstb.2011.0358 pmid:22371615 pmcid:PMC3282309 fatcat:d57d2nbz6jghnbz3nlaszjlfay

Page 385 of The London Magazine Enlarged and Improved Vol. 40, Issue [page]

1771 The London Magazine Enlarged and Improved  
Proteéted by Rae of the Houfe, you refolv- add fuel to the fire of popular "y, and, fince you could not ruin 2 conviction, to ruin by bold ons, by ambiguous hints, and Aree _ You’ will pardon me ‘f with  ...  in the in- tte of the motion.  ... 

Directional Hearing in Fishes [chapter]

Richard R.
2011 Advances in Sound Localization  
It is axisymmetric, with a relative sound pressure null at locations in the field that are perpendicular to the axis of source motion.  ...  Contour plot of sound pressure field in the test arena. A and B are alternative fish release sites. B. Particle motion field in the test arena calculated from pressure gradient measurements.  ...  Sound source localization (SSL) is defined as the determination of the direction from a receiver, but also includes the distance from it.  ... 
doi:10.5772/13892 fatcat:jdwf73p7ujawdczmt7zclcrt7m

Page 20873 of Scientific American Supplement Vol. 50, Issue 1302 [page]

1900 Scientific American Supplement  
change in direction of P motion in space when CAP came into a straight line; this sudden change in direction of P’s motion is due to the rota- tion of the line AP.  ...  The parallelogram of motion still stands without ex ception and hints that general direction of motion is along P R and equal to P R.  ... 

Linear Quasi-Parallax SfM Using Laterally-Placed Eyes

Chuanxin Hu, Loong Fah Cheong
2009 International Journal of Computer Vision  
In particular, we leverage on the pair of visual rays that are parallel to each other but opposite in direction, and compute what we call the quasiparallax for translation recovery.  ...  narrow field of view.  ...  In this paper, we pursue this strategy of pooling motion information from visual fields that are 180 • opposite to each other for general ego-motion estimation.  ... 
doi:10.1007/s11263-009-0226-0 fatcat:25loiildprapbm2phl73wp2dfm

The pitch angle paradox and radiative life times in a synchrotron source [article]

Ashok K. Singal
2016 arXiv   pre-print
The argument is based on Larmor's radiation formula, where in a synchrotron case the radiation power is along the instantaneous direction of motion of the charge.  ...  This apparent paradox is resolved when effects on the charge motion are calculated not from Larmor's formula but from Lorentz's radiation reaction formula.  ...  All charges of a given energy and pitch angles, directed towards the observer in a narrow angle 1/γ around the line of sight not only lose energy but will also get shifted outside the angle 1/γ around  ... 
arXiv:1602.09033v1 fatcat:e4bfl2phunfvplw5wytveo7wpu

Page 4300 of Psychological Abstracts Vol. 91, Issue 12 [page]

2004 Psychological Abstracts  
A third answer, hardly ever entertained, is that space is a biological/ ecological concept.  ...  In the second experiment the point-light figure was walking backwards, making the global orientation of the point-light fig- HUMAN EXPERIMENTAL PSYCHOLOGY ure opposite to the direction of global motion  ... 

Chance

W. H. Sheldon
1912 The Journal of Philosophy Psychology and Scientific Methods  
Of course this tendency is hardly ever, if ever, completely realized. It is a limiting coincept, like that of law and causation.  ...  the field wherein such variations occur we are not concerned; enough that they are widely prevalent.  ... 
doi:10.2307/2013103 fatcat:jbm3drcwxzh37ltzdr2g3d2j2u

Top-down influences on ambiguous perception: the role of stable and transient states of the observer

Lisa Scocchia, Matteo Valsecchi, Jochen Triesch
2014 Frontiers in Human Neuroscience  
state of the observer in perceiving ambiguous displays.  ...  Here we offer an overview of both classical and recent contributions on how stable and transient states of the observer can impact ambiguous perception.  ...  CONCLUDING REMARKS The truthfulness of the outside world, as it appears to the viewer's eye, is hardly ever questioned by the man in the street.  ... 
doi:10.3389/fnhum.2014.00979 pmid:25538601 pmcid:PMC4259127 fatcat:viw5x6hg5rcmllwh534zadvpke

Ecological optics of natural materials and light fields

Sylvia C. Pont, Bernice E. Rogowitz, Thrasyvoulos N. Pappas
2009 Human Vision and Electronic Imaging XIV  
Human observers are able to match and discriminate simple light field properties (e.g. average illumination direction and diffuseness) of objects and scenes, but they make systematic errors, which depend  ...  Image analysis on the basis of second order statistics and human observers estimates correspond well and are both subject to the bas-relief and the convex-concave ambiguities.  ...  Susan te Pas, Astrid Kappers and Jim Todd for the fruitful collaboration in the studies which were reported in this paper, the technical support from Utrecht University, and Philips Research for the use of  ... 
doi:10.1117/12.817162 dblp:conf/hvei/Pont09 fatcat:muwthz4z25cethh4ckuewboqyu

Review of Eric Clarke, Ways of Listening: An Ecological Approach to the Perception of Musical Meaning (Oxford University Press, 2005; paperback, 2011)

Daphne Tan
2015 Music Theory Online  
While Clarke notes in 2005 that only "partial convergence" between the two fields had taken place, in 2015, such a union is hardly uncommon.  ...  meaning-is as relevant as ever.  ...  the profound impact of human beings and their cultures; and that in a reciprocal fashion perceivers are highly structured organisms that are adapted to that environment" (17)  ... 
doi:10.30535/mto.21.3.14 fatcat:bzoqjl6g3vexvcuowxwrgfvygm

Hawking Radiation, the Unruh Effect and the Polarization of Electrons

Jon Leinaas
1991 EurophysicsNews  
The polarization of electrons induced by quantum fluctuations of the vacuum field can be used as a robust radiation detector for the Unruh effect, where an idealized thermometer accelerated through vacuum  ...  It is the vertical fluctuations (in the direction of the magnetic field) which induce spin transitions.  ...  motion.  ... 
doi:10.1051/epn/19912204078 fatcat:vfq7tdjo3jhl3eze5wmlljp2ny

Spatio-Temporal Interpolation Is Accomplished by Binocular Form and Motion Mechanisms

Farid I. Kandil, Markus Lappe, Sheng He
2007 PLoS ONE  
The commonly proposed mechanism is a spatio-temporal motion detector with a receptive field, for which spatial distance and temporal delays are interchangeable, and which has generally been regarded as  ...  Spatio-temporal interpolation describes the ability of the visual system to perceive shapes as whole figures (Gestalts), even if they are moving behind narrow apertures, so that only thin slices of them  ...  INTRODUCTION Spatio-temporal interpolation is one of those integrative components underlying our visual experience so perfectly that one would hardly ever think that there is a problem at all.  ... 
doi:10.1371/journal.pone.0000264 pmid:17327923 pmcid:PMC1800347 fatcat:cs2wdvdaavasvkls4hyaocelym
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