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 28 for “"Optic Flow"”.
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Facet model optic flow and rigid body motion
… uses the facet model technique to compute the optic flow field directly from a time sequence of image frames. Two techniques, an iterative and a non-iterative one, determine 3D motion parameters and surface structure (relative depth) from the computed optic flow field. Finally we discuss a …
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Control of a Quadcopter Aerial Robot Using Optic Flow Sensing
… of a custom-built quadcopter aerial robot using optic flow sensing. Optic flow sensing is a vision-based approach that can provide a robot the ability to fly in global positioning system (GPS) denied environments, such as indoor environments. In this work, optic flow sensors are used to stabilize …
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The Effect of Optic Flow During Attention Related Tasks and Quiet Stance
… and different cognitive attention tasks. Optic flow was amplified or reduced to 4 gain conditions (0.25x,1x,4x,16x) within virtual reality (VR) relative to the head position while participants stood quietly on a force plate that measure ground reaction forces and completed 12 randomized …
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An extension to optic flow analysis for the generation of computer animated images
… based animation methods using the technique of optic flow analysis developed for a moving planar object. Image based rendering is presented as a class of algorithm using two dimensional shortcuts to the problem of three dimensional animation. The optic flow field is used to develop an image …
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A Continuous-Time Nonlinear Observer for Estimating Structure from Motion from Omnidirectional Optic Flow
… the observer utilizes an omni-directional optic flow field. Exponential stability of the observer is assured provided the persistency of excitation condition is met. Persistency of excitation is assured by altering the direction of motion sufficiently quickly. An equal convergence rate on …
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Effects of Manipulating Optic Flow Gain on Dynamic Postural Control During Continuous Support Surface Translations
… surfaces. Limited work utilizes VR-induced optic flow with continuous platform translations to examine balance. SS oscillations perturbed participants in the A-P direction. Kinetic and kinematic information was quantified into center-of-pressure, center-of-mass, and joint and segment angles. …
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Visual optic flow processing for posture and 3D shape perception in primary open angle glaucoma
… the processing of large field visual motion (optic flow) information is critical for postural control and 3-dimensional (3D) shape perception. Histopathological and psychophysical studies support the view that primary open angle glaucoma (POAG) preferentially damages the magnocellular (M) …
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A comparison of human walking using a conventional gait laboratory and the Motek Medical Computer Assisted Rehabilitation Environment (CAREN)
… different walking conditions, with and without optic flow. The secondary aim was to investigate the accuracy of the two motion-analysis systems used. Following ethical approval of this investigation, testing was initiated. Participants walked under four different walking conditions, over ground, …
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Vision-Based Self-Motion Estimation in a Fixed-Wing Aerial Vehicle
… to us for testing. After image pre-processing, optic flow data is determined by automatically finding and tracking good features between pairs of images. The image coordinates of matched features are then processed by a rigid-object linear optic flow-motion estimation algorithm. Input factors …
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Contribution of Modified Visual Gain to Human Balance Control During Quiet, Upright Stance
… this thesis aimed to understand how the gain of optic flow contributes to balance control during quiet, upright stance among healthy adults. Optic flow was amplified or reduced relative to head motion while participants stood quietly on either a firm or foam surface. Overall, when there was an …
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Joint Representation of Translational and Rotational Components of Self-Motion in the Parietal Cortex
… the velocity patterns projected onto the retina (optic flow) are a combination of the two. Since navigational tasks can be extremely varied, such as deciphering heading or tracking moving prey or estimating one's motion trajectory, it is imperative that the visual system represent both the T and R …
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Visually guided flight in birds using the budgerigar (Melopsittacus undulatus) as a model system
Keywords: Edge detection, Optic flow, Obstacle avoidance
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Visually guided flight in birds using the budgerigar (Melopsittacus undulatus) as a model system
Keywords: Edge detection, Optic flow, Obstacle avoidance
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Sublethal Effects of Pesticides on Visually-Guided Bee Behaviours
… to motion and rely on motion of visual elements (optic flow) to efficiently navigate their complex environment with high precision. Optic flow stimulates an innate response known as the optomotor response, which enables the bees to orient and maintain a straight course during flight. The …
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Human Visual Navigation: Effects of Visual Context, Navigation Mode, and Gender
… research on human visual path integration using optic flow cues. In three experiments, a large-scale path-completion task was contextualised within highly-textured authentic virtual environments. Real-world navigational experience was further simulated, through the inclusion of a large roundabout …
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Using new tools to study the neural mechanisms of sensation: Auditory processing in locusts and translational motion vision in flies
… indicators into central neuropils for in vivo optical imaging of sound-evoked activity, as well as calling song-evoked activity in the brain. The work completed at the Janelia Research Campus began with the development of a modern version of a modular LED display and virtual reality control …
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THE FUNCTIONAL ROLES OF THE MOTION PERCEPTION SYSTEMS
… One is simply the motion on the retina, known as optic flow, caused by motion in the world. Another source of flow-based information is the differences between the optic flow fields of the two eyes, known as interocular velocity differences. Also, there is disparity-based information about motion …
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Neural Underpinnings of Walking Under Cognitive and Sensory Load: A Mobile Brain/Body Imaging Approach
… the third study assessed the effects of sensory (optic flow and visual perturbations) and cognitive load (Go/No-Go task) manipulations on gait and cortical neuro-oscillatory activity in young adults. While walking under increased load, participants adopted a more conservative pattern of gait by …
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Attention in a meaningful world: brain responses to behavioral relevance
… automatically to the heading point in an optic flow field simulating the patterns of visual stimulation that accompany self-motion. Together, the results converge on the conclusion that attention can be oriented automatically in a dynamic, flexible, and continuous manner on the basis of …
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