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.
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Showing 1 to 20 of 23 for “"image statistics"”.
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Image statistics and the perception of surface reflectance
… surface under unknown illumination from a single image is a hard problem. Recent work in reflectance recognition has shown that certain statistics measured o an image of a surface are diagnostic of reflectance. We consider opaque surfaces with medium scale structure and spatially homogeneous …
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Digital image forensics
Digital image forensics is a relatively new research field that aims to expose the origin and composition of, and the history of processing applied to digital images. Hence, the digital image forensics is expected to be of significant importance to our modern society in which the digital media are …
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Surface reflectance recognition and real-world illumination statistics
… photograph is difficult because the observed image depends heavily on the amount of light incident from every direction. A mirrored sphere, for example, produces a different image in every environment. To make matters worse, two surfaces with different reflectance properties could produce …
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Synthetic aperture radar image simulator for interferometry
… process, mission planning and radar image interpretation. The simulation method employs image statistics and terrain geometry to form a synthetic image and requires inputs of a digital elevation model (DEM), flight path, description, radar parameters, a terrain classification map and …
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Automatic matching of features in Synthetic Aperture Radar data to digital map data.
… now being generated demand automatic tools for image interpretation. Where available, map data provides a valuable aid for visual interpretation and it should aid automatic interpretation. Automatic map based interpretation will be heavily dependent on methods for matching image and map …
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Sensory representations optimized for the natural environment
… how different aspects of natural stimulus statistics can impact and determine perceptual behavior and sensory representation in both biological and artificial systems. In Chapter 1, I provide a brief review of the theory of efficient coding, models of natural image statistics, and the …
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High-level visual object representation in juvenile and adult primates
… (CNNs). We then describe a set of natural image statistics automatically incorporated into high-performing CNNs from supervised training-it is possible primate development incorporates these or similar natural image statistics into its synaptic strengths. Finally, we describe the …
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Statistical analysis and transfer of coarse-grain pictorial style
We show that image statistics can be used to analyze and transfer simple notions of pictorial style of paintings and photographs. We characterize the frequency content of pictorial styles, such as multi-scale, spatial variations, and anisotropy properties, using a multi-scale and oriented …
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Image super-resolution via sparse representation
This thesis presents a new approach to single-image super-resolution (SR), based on sparse signal recovery. Research on image statistics suggests that image patches can be well represented as a sparse linear combination of elements from an appropriately chosen over-complete dictionary. Inspired by …
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Efficient inference and learning for computer vision labelling problems
… towards the era of large videos and gigapixel images, computational efficiency is becoming increasingly important. We present two novel methods to improve the efficiency of energy minimization algorithms. The first method works by "recycling" results from previous problem instances. The second …
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The Discovery of perceptual structure from visual co-occurrences in space and time
… groups at the pixel level. I show that low-level image statistics are surprisingly effective at higher-level segmentation. I present an algorithm that groups pixels by identifying meaningful co-occurrences in an image's color statistics. Consider a zebra. Black-next-to-white occurs suspiciously …
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Motion perception and the scene statistics of motion
… coding in the brain undoubtedly reflects the statistics 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 …
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Multi-stage processing for effective segmentation of SAR sea ice images
… which made possible to acquire High-Resolution imagery of remote areas such as the Arctic region. Consequently, with the accessibility to such large amounts of data, it becomes necessary to develop fast, robust and automated image segmentation algorithms to extract key information as opposed to …
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Image statistical frameworks for digital image forensics
… advances of digital cameras, scanners, printers, image editing tools, smartphones, tablet personal computers as well as high-speed networks have made a digital image a conventional medium for visual information. Creation, duplication, distribution, or tampering of such a medium can be easily done, …
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Structural Studies of Protein Transport
… particle orientations and per-particle image statistics that would be suitable for high-resolution reconstruction, if a sufficient number of particle images could be obtained. A structure of human Get1/2/3 that was published after this work is briefly reviewed.
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Buildings, beauty, and the brain: psychological responses to architectural design
… in the literature by using pattern theory and image statistics to quantify aesthetic properties of architectural scenes (Chapters 4-5), and by advancing our understanding of how specific neural networks and psychological processes contribute to architectural experience (Chapters 2-3). Chapter 2 …
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Is Gloss a cue for Real-World Object Size?
… in real-world object size in both the object image and texture image task groups. For the normal object images, small objects were perceived as being glossier than big objects. For the texture images, big objects were perceived as being glossier than small objects. Between the conditions, …
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The mechanisms of reliable coding in mouse visual cortex
… coding. Thus, the first aim is to elucidate how image statistics modulate reliable coding in V1. To this end, I developed a novel noise masking procedure that allowed us to specifically perturb the spectral content of natural movies without altering the edges. Using high-speed twophoton calcium …
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A Computational Neuroscience Approach to Higher-Order Texture Perception
Natural images contain large amounts of structural information characterised by higher-order spatial correlations. Neurons have limited capacities, so the visual system must filter out non-salient information, but retain that which is behaviourally relevant. Previous research has concentrated on …
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A Computational Neuroscience Approach to Higher-Order Texture Perception
Natural images contain large amounts of structural information characterised by higher-order spatial correlations. Neurons have limited capacities, so the visual system must filter out non-salient information, but retain that which is behaviourally relevant. Previous research has concentrated on …
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