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 69 for “"Human Vision"”.
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Modeling human vision using feedforward neural networks
… and evaluation of a new computational model for human vision. Our goal is to understand the mechanisms enabling invariant perception under scaling, translation, and clutter. The model is based on I-Theory [50], and uses convolutional neural networks. We investigate the explanatory power of this …
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Interocular suppression and contrast gain control in human vision
The human visual system combines contrast information from the two eyes to produce a single cyclopean representation of the external world. This task requires both summation of congruent images and inhibition of incongruent images across the eyes. These processes were explored psychophysically …
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A study of pupil response components in human vision
… of the pupil of the eye in relation to human vision and brain function. It also evaluates the potential application of new research techniques to clinical studies that involve assessment of the visual function. Pupil response components were investigated in normal subjects and in …
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A study of pupil response components in human vision
… of the pupil of the eye in relation to human vision and brain function. It also evaluates the potential application of new research techniques to clinical studies that involve assessment of the visual function. Pupil response components were investigated in normal subjects and in …
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Interocular suppression and contrast gain control in human vision
The human visual system combines contrast information from the two eyes to produce a single cyclopean representation of the external world. This task requires both summation of congruent images and inhibition of incongruent images across the eyes. These processes were explored psychophysically …
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Toward accessible evaluation of the electrophysiology of human vision
As photoreceptors in our retinas capture discrete photons, that energy is converted into an electrochemical signal which shoots back through the optic nerve and into our visual cortex. We can sample that signal as it's transmitted, by delivering specific stimuli and recording the aggregate response …
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Occupational Factors Affecting the Accommodative Response in the Human Vision System
Accommodative microfluctuations (AMFs) are temporal variations in the accommodative response. AMFs can be divided into two categories, the low frequency component (LFC) measuring below 0.6 Hz and the high frequency component (HFC) measuring between 1.0 and 2.3 Hz. This thesis examined occupational …
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Occupational Factors Affecting the Accommodative Response in the Human Vision System
Accommodative microfluctuations (AMFs) are temporal variations in the accommodative response. AMFs can be divided into two categories, the low frequency component (LFC) measuring below 0.6 Hz and the high frequency component (HFC) measuring between 1.0 and 2.3 Hz. This thesis examined occupational …
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Testing the limits of human vision with quantum states of light
We discuss our progress towards testing whether humans can see single photons, using a single-photon source based on spontaneous parametric downconversion and techniques from quantum optics. We review the existing evidence on single-photon vision, and show why no previous experiments with classical …
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Characterizing human vision through large-scale brain imaging and computational models
Efforts to understand the neural underpinnings of human visual processing require sufficient experimental data and robust models. This thesis significantly contributes to both these fronts while simultaneously elucidating some of the most intriguing aspects of the human visual system. In the first …
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Functional aspects of blur adaptation in human vision. A study of the mechanism of blur adaptation in human vision - its origin and scope evidenced using subjective and objective procedures.
… aspects of the mechanism of blur adaptation in human vision using subjective and objective methods. Parafoveal visual acuity measured under defocused conditions demonstrates that blur adaptation is not limited to the fovea. The presence of the adaptive mechanism in the parafovea also suggests …
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Facial Expression Recognition: Fusion of A Human Vision System Model and A statistical framework
Automatic facial expression recognition from still face (color and gray-level) images is acknowledged to be complex in view of significant variations in the physiognomy of faces with respect to head pose, environment illumination and person-identity. Even assuming illumination and pose invariance …
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Evaluating ventral visual stream contributions to human visual robustness with deep learning approaches
The human visual system exhibits remarkable robustness, allowing resilient object recognition despite noisy and ambiguous sensory inputs. Such perceptual invariance has been proposed to stem from hierarchical computations along the ventral visual stream (VVS), a series of brain regions that …
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Invariance properties of the human visual system in one-shot learning
This work first characterizes human invariant recognition in one-shot learning. By using novel stimuli, we address the question whether invariance to transformation emerges from experience and memorization of templates or from the brain instantly computing invariant representation. Our …
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A study in human attention to guide computational action recognition
Computer vision researchers have a lot to learn from the human visual system. We, as humans, are usually unaware of how enormously difficult it is to watch a scene and summarize its most important events in words. We only begin to appreciate this truth when we attempt to build a system that …
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Robust Computer Vision beyond Lₚ Adversaries
Deep learning computer vision systems, integral to technologies such as self-driving cars, facial recognition, and content moderation, require robustness against diverse perturbations to ensure reliability and safety. Examples of such perturbations include variations in lighting conditions, …
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Saliency detection via divergence analysis: a unified perspective
… inspired from psychophysical studies of human vision, the theoretical relations among them are unclear. In this thesis, we provide such a bridge. The saliency is defined in terms of divergence between feature distributions estimated using samples from center and surround, respectively. We …
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New Test Set for Video Quality Benchmarking
… color characteristics, and several aspects of human vision such as visual acuity and dynamic response. The standard observer is part of the "extended video imaging system" (EVIS).</p> <p>The new test set allows image quality benchmarking by a panel of standard observers at the same time. The …
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Understanding Human Perception Through MooneyFaces
Human vision is remarkably tolerant to image distortions: even when every pixel in an image has been destructively altered, as in classic Mooney displays, humans can still extract information about identity, pose, and more. Most current deep learning computer vision models perform well with …
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Assessment of anthropocentric representations of color patterns for biological relevance
… These observations have led some to propose that human vision and the anthropocentric expressions of coloration based on our vision can never be used to detect variation in animal coloration. Yet this assertion is at odds with a long history of studying animal coloration in ecological, …
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