scholarly journals Detecting natural occlusion boundaries using local cues

2012 ◽  
Vol 12 (13) ◽  
pp. 15-15 ◽  
Author(s):  
C. DiMattina ◽  
S. A. Fox ◽  
M. S. Lewicki
Keyword(s):  
Occlusion Boundaries ◽  
Local Cues

Neither by global nor local cues alone: evidence for a unified orientation process

2011 ◽  
Vol 14 (5) ◽  
pp. 665-674 ◽  
Author(s):  
Kent D. Bodily ◽  
Caroline K. Eastman ◽  
Bradley R. Sturz
Keyword(s):  
Orientation Process ◽  
Local Cues

scholarly journals The forest or the trees: preference for global over local image processing is reversed by prior experience in honeybees

2015 ◽  
Vol 282 (1799) ◽  
pp. 20142384 ◽  
Author(s):  
Aurore Avarguès-Weber ◽  
Adrian G. Dyer ◽  
Noha Ferrah ◽  
Martin Giurfa
Keyword(s):  
Visual Processing ◽  
Visual Information ◽  
Visual Recognition ◽  
Spatial Configuration ◽  
Local Information ◽  
Insect Vision ◽  
Hierarchical Stimuli ◽  
Spatial Configurations ◽  
Holistic Perception ◽  
Local Cues

Traditional models of insect vision have assumed that insects are only capable of low-level analysis of local cues and are incapable of global, holistic perception. However, recent studies on honeybee ( Apis mellifera ) vision have refuted this view by showing that this insect also processes complex visual information by using spatial configurations or relational rules. In the light of these findings, we asked whether bees prioritize global configurations or local cues by setting these two levels of image analysis in competition. We trained individual free-flying honeybees to discriminate hierarchical visual stimuli within a Y-maze and tested bees with novel stimuli in which local and/or global cues were manipulated. We demonstrate that even when local information is accessible, bees prefer global information, thus relying mainly on the object's spatial configuration rather than on elemental, local information. This preference can be reversed if bees are pre-trained to discriminate isolated local cues. In this case, bees prefer the hierarchical stimuli with the local elements previously primed even if they build an incorrect global configuration. Pre-training with local cues induces a generic attentional bias towards any local elements as local information is prioritized in the test, even if the local cues used in the test are different from the pre-trained ones. Our results thus underline the plasticity of visual processing in insects and provide new insights for the comparative analysis of visual recognition in humans and animals.

The activity of neurogenin1 is controlled by local cues in the zebrafish embryo

Development ◽  
1997 ◽  
Vol 124 (22) ◽  
pp. 4557-4569 ◽  
Author(s):  
P. Blader ◽  
N. Fischer ◽  
G. Gradwohl ◽  
F. Guillemont ◽  
U. Strahle
Keyword(s):  
Motor Neurons ◽  
Zebrafish Embryo ◽  
Neural Plate ◽  
Dominant Negative ◽  
Regulatory Subunit ◽  
Primary Neurons ◽  
Helix Loop Helix ◽  
Induced Neurons ◽  
Ectopic Neurons ◽  
Local Cues

Zebrafish neurogenin1 encodes a basic helix-loop-helix protein which shares structural and functional characteristics with proneural genes of Drosophila melanogaster. neurogenin1 is expressed in the early neural plate in domains comprising more cells than the primary neurons known to develop from these regions and its expression is modulated by Delta/Notch signalling, suggesting that it is a target of lateral inhibition. Misexpression of neurogenin1 in the embryo results in development of ectopic neurons. Markers for different neuronal subtypes are not ectopically expressed in the same patterns in neurogenin1-injected embryos suggesting that the final identity of the ectopically induced neurons is modulated by local cues. Induction of ectopic motor neurons by neurogeninl requires coexpression of a dominant negative regulatory subunit of protein kinase A, an intracellular transducer of hedgehog signals. Moreover, the pattern of endogenous neurogenin1 expression in the neural plate is expanded in response to elevated levels of Hedgehog (Hh) signalling or abolished as a result of inhibition of Hh signalling. Together these data suggest that Hh signals regulate neurogenin1 expression and subsequently modulate the type of neurons produced by Neurogenin1 activity.

scholarly journals Navigation by Dead Reckoning and Local Cues

1993 ◽  
Vol 46 (3) ◽  
pp. 364-370 ◽  
Author(s):  
A. S. Etienne ◽  
V. Séguinot
Keyword(s):  
Coordinate System ◽  
Dead Reckoning ◽  
Cognitive Map ◽  
Familiar Environment ◽  
The Subject ◽  
Absolute Coordinate System ◽  
Actual Location ◽  
Local Cues

According to comprehensive theories of navigation, animals navigate by using two complementary strategies: (1) dead reckoning informs the subject in a continuous manner on its actual location with respect to an Earthbound or absolute coordinate system; while (2) long-term associations between particular landmarks and specific locations allow the animal to find its way within a familiar environment. If the subject structures familiar space as a system of interconnected places – the so-called ‘cognitive map’ – it may know through dead reckoning where it is located on its map and relate its route-based expectations to the actually perceived scenario of local cues.

scholarly journals Further evidence that local cues to shape in RF patterns are integrated globally

2012 ◽  
Vol 12 (12) ◽  
pp. 16-16 ◽  
Author(s):  
J. E. Dickinson ◽  
J. McGinty ◽  
K. E. Webster ◽  
D. R. Badcock
Keyword(s):  
Local Cues

scholarly journals Effect of Scene Complexity on Colour Constancy with Real Three-Dimensional Scenes and Objects

Perception ◽  
10.1068/p5182 ◽  
2005 ◽  
Vol 34 (8) ◽  
pp. 947-950 ◽  
Author(s):  
Sérgio M C Nascimento ◽  
Vasco M N de Almeida ◽  
Paulo T Fiadeiro ◽  
David H Foster
Keyword(s):  
Test Object ◽  
Dominant Role ◽  
Three Dimensional ◽  
Virtual Image ◽  
Colour Constancy ◽  
Novel Technique ◽  
Scene Structure ◽  
Complex Scenes ◽  
Local Cues

The effect of scene complexity on colour constancy was tested with a novel technique in which a virtual image of a real 3-D test object was projected into a real 3-D scene. Observers made discriminations between illuminant and material changes in simple and complex scenes. The extent of colour constancy achieved varied little with either scene structure or test-object colour, suggesting a dominant role of local cues in determining surface-colour judgments.

scholarly journals Finding Temporally Consistent Occlusion Boundaries in Videos Using Geometric Context

2015 ◽  
Author(s):  
S. Hussain Raza ◽  
Ahmad Humayun ◽  
Irfan Essa ◽  
Matthias Grundmann ◽  
David Anderson
Keyword(s):  
Geometric Context ◽  
Occlusion Boundaries
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