Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 39 for “"Natural scenes"”.
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Attentional Mechanisms in Natural Scenes
… when preparing to search for objects in scenes; Chapter 4 addresses the stage of guidance and selection, by investigating the temporal course of spatial attention guidance; and finally, Chapter 5 addresses the identification phase, by investigating the temporal dynamics of size-constancy …
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Camera Spatial Frequency Response Derived from Pictorial Natural Scenes
… the standard e-SFR directly from pictorial natural scenes. This methodology has the potential to produce scene dependant and real-time camera system performance measurements, opening new possibilities in imaging science and allowing live monitoring/calibration of systems for autonomous …
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Fast Algorithms For Fragment Based Completion In Images Of Natural Scenes
… with no knowledge of the underlying scene. In natural images there is a strong horizontal orientation of texture/color distribution. We exploit this fact in our proposed algorithm to fill in missing regions from natural images. We follow the principle of figural familiarity and use the image as …
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Recovering the Orientation of Textured Surfaces in Natural Scenes (Image Processing)
… elements. Results are shown on images of many natural textures, including rocks, leaves, waves, flowers, bark, and clouds. Textures consist of both bright and dark regions, corresponding to lit and shadowed areas, or to foreground and background. The positive-contrast and negative-contrast …
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The influence of semantics on the visual processing of natural scenes
… activity across pictures and words that describe natural scenes. A whole brain MVPA searchlight revealed multiple brain regions in the occipitotemporal, posterior parietal and frontal cortices that showed transfer from pictures to words and from words to pictures. In addition to sharing similar …
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The scene superiority effect: object recognition in the context of natural scenes
… identity. We apply this paradigm to objects in natural scenes, having subjects discriminate between objects in the context of scenes. Because the target objects were equally semantically consistent with any given scene and could appear in either semantically consistent or inconsistent contexts …
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The visual processing of human faces and bodies as visual stimuli in natural scenes
… attention over other objects. However, under natural viewing conditions the human face is attached to a substantial cue, the human body. The evidence to-date of a similar attentional processing advantage for human bodies is less clear. This is remarkable given the social significance and …
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Mapping inter-subject and inter-regional brain connectivity during free viewing of novel natural scenes
… have examined the mechanisms involved during natural conditions by asking subjects to freely view the presentation of a movie. The objective of our study was to further observe the extent to which similarities are present between subjects during natural vision. It was hypothesized that there …
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Investigating *Perception and Eye Movement Control in Natural Scenes Using Gaze -Contingent Multi -Resolutional Displays
Finally, useful information for designers of GCMRDs is presented.
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The impact of water and anthropogenic objects on implicit evaluations of natural scenes: a restorative environments perspective
… can be beneficial to health and wellbeing. Among natural landscapes, aquatic (blue space) scenes are among the most preferred and psychologically restorative. Since such landscapes face an increasing range of demands, there is a need to understand how their restorative qualities arise and might be …
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Mind-craft: Exploring the relation between "digital" visual experience and orientation in visual contour perception
… is the orientation anisotropy typical of natural scenes; most natural scenes contain slightly more horizontal and vertical information than oblique information. This property is likely a primary cause of the “oblique effect” in visual perception, in which subjects experience greater …
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A global framework for scene gist
… are able to rapidly and accurately categorize natural scenes, but the representation mediating this feat is still unknown. Here we propose a framework of rapid scene categorization that does not segment a scene into objects and instead uses a vocabulary of global, ecological properties that …
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What and where : a Bayesian inference theory of visual attention
… identity and the position of objects in visual scenes: spatial attention emerges as a strategy to reduce the uncertainty in shape information while feature-based attention reduces the uncertainty in spatial information. Featural and spatial attention represent two distinct modes of a …
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Motion perception and the scene statistics of motion
… of retinal image motion occurring in the natural environment. Measuring the statistics of motion in natural scenes is an important tool for building our understanding of how the brain works. Unfortunately, there are statistics that are either impossible or prohibitively difficult to …
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Retinal ensemble coding under dynamic conditions
… information from the eye to the brain. Since natural scenes comprise several visual features, this study investigates how the activity of retinal ganglion cells encodes motion information under dynamic light intensity conditions. Multiple turtle and carp retinal ganglion cell responses to …
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Measuring Memory in an Alzheimer's Treatment Trial Using a Visual Search Task
… that appeared/disappeared in flickering natural scenes, yielding faster search times for remembered targets than for forgotten ones. AD patients took longer and required more fixations to detect targets, indicating impaired memory. Furthermore, the AD and aged populations exhibited slower …
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Multi-resolution region-preserving segmentation for color images of natural scene
… over-segmented results, especially for images of natural scenes whose regions contain complex but coherent mixture of colors. This thesis describes a multi-resolution segmentation algorithm which rst constructs a region pyramid that preserves the color distributions of regions, and then applies a …
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Photon-efficient computational imaging with single-photon avalanche diode (SPAD) arrays
… and reflectivity are spatially correlated in natural scenes, to perform noise censoring and regularized maximum-likelihood estimation. We expand on this research by adapting the method for use with SPAD arrays, accounting for the spatial non-uniformity of imaging parameters and the effects of …
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Image database retrieval with multiple-instance learning techniques
… The approach is tested on a large database of natural scenes as well as single- and multiple-object images. Comparisons are made against a previous approach, and the effects of tuning various training parameters, as well as that of adjusting algorithmic details, are also studied.
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