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 32 for “"stereopsis"”.
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Integrating Shape-from-Shading & Stereopsis
… two specific techniques: shape-from-shading and stereopsis. Shape-from-shading calculates shape using the lighting equation, which takes surface orientation and lighting information to irradiance. As irradiance and lighting information are provided this is the problem of inverting a many to one …
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DeepMVS: learning multi-view stereopsis
We present DeepMVS, a deep convolutional neural network (ConvNet) for multi-view stereo reconstruction. Taking an arbitrary number of posed images as input, we first produce a set of plane-sweep volumes and use the proposed DeepMVS network to predict high-quality disparity maps. The key …
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Dynamical systems approach to binocular stereopsis
The extraction of depth in binocular stereopsis relies upon the ability to detect the co-occurrence of similar features in a stereo pair of images and the subsequent extraction of positional disparity. The fundamental problem of stereopsis is to achieve coordinated activity through the linkage of …
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Ranging of Aircraft Using Wide-baseline Stereopsis
… was to investigate the efficacy of wide-baseline stereopsis as a method of ranging aircraft, specifically as a possible sense-and-avoid solution in Unmanned Aerial Systems. Two studies were performed: the first was an experimental pilot study to examine the ability of humans to range in-flight …
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Brain stimulation reveals neural mechanisms of stereopsis
Stereopsis is critical for interaction with our environment. However, binocular disparity in natural images is often ambiguous and this makes it difficult to establish a binocular correspondence solution. In my thesis, I focus on both the challenges of this problem and solutions that the brain …
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An investigation of stereopsis with AN/AVS-6 night vision goggles at varying levels of illuminance and contrast
The increased reliance on night operations by the military over the last few decades has led to the development of various night imaging devices. Night vision goggles (NVGs) are one device which have gained widespread use in nighttime helicopter operations. However, rotorcraft accident data have …
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Case Studies in Invertebrate Visual Processing: I. Spectral and Spatial Processing in the Early Visual System of Drosophila melanogaster II. Binocular Stereopsis in Sepia officinalis
… the visual processing mechanism known as stereopsis in the cuttlefish Sepia officinalis. Stereoscopic vision is used to assess depth information by comparing the disparity between left and right visual fields. This strategy is commonplace in vertebrates having evolved multiple times …
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Perceived Depth in Virtual and Physical Environments
Theoretically, stereopsis provides accurate depth information if information regarding absolute distance is accurate and reliable. However, assessments of stereopsis often report depth distortions, particularly for virtual stimuli. These distortions are often attributed to misestimates of viewing …
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The Effects of Binocular Vision Impairment on Adaptive Gait. The effects of binocular vision impairment due to monocular refractive blur on adaptive gait involving negotiation of a raised surface.
… analysis system to measure how impairment of stereopsis affected adaptive gait during a negotiation of a step, secondly by determining which clinical stereotest was the most reliable for measuring stereoacuity in elderly subjects and finally investigating how manipulating the perceived height …
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Assessment of Stereoacuity in Patients with Strabismus
… patients showed the largest proportion of absent stereopsis with TNO stereotest. No factor was significant for stereopsis in patients with intermittent exotropia and patients with refractive accommodative esotropia. CONCLUSIONS: The stereoacuity showed various seconds of arc according to the type …
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The Effect of interocular Difference of Retinal Illuminance on Streopsis
… illuminanceon stereopsisunderbinocularcycloplegiatoeliminatethechange of pupilsizeandaccommodation. METHODS: Fifty adultswho havebestcorrected visualacuity 1.0 orbetter and normalbinocularity were examined with neutraldensity filters under …
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Effects of retinal disparity depth cues on cognitive workload in 3-D displays
… stereoscopic CRT displays. The usefulness of stereopsis to present depth information has been studied in terms of performance measures such as search time, search accuracy, and subjective image quality ratings. Few, if any, studies have been conducted to investigate the influence of stereopsis …
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Charting Presence in Virtual Environments and its Effects on Performance
… field of view, sound, textures, head-tracking, stereopsis, virtual personal risk, number of possible interactions, presence of a second user, and environmental detail. Participants performed a set of five tasks in the VE and rated perceived presence at the end of each set using the technique of …
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Aging and Stereoscopic Shape Perception
… led to inconsistent findings. Some research on stereopsis and aging has found that younger and older adults are essentially the same in terms of their stereoscopic ability, while other research has found evidence of large differences. This past research has largely been limited to investigations …
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Effects of depth cues on depth judgements using a field-sequential stereoscopic CRT display
… images. Although it is widely believed that stereopsis provides a potent depth information cue, numerous monocular cues exist which may augment, detract from, or even supplant stereopsis. Unfortunately, few guidelines or well-controlled analyses on the use of depth cues are available to …
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Neural computation of depth from binocular disparity
Stereopsis is a par excellence demonstration of the computational power that neural systems can encapsulate. How is the brain capable of swiftly transforming a stream of binocular two-dimensional signals into a cohesive three-dimensional percept? Many brain regions have been implicated in …
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Computational and laboratory investigations of a model of blood droplet flight for forensic applications
… 3D (S3D) creates the impression of depth (stereopsis) in at images by providing additional binocular depth cues, such as convergence and binocular disparity. In this thesis, we explore the e ects that S3D has on the player experience in an attempt to uncover design methodologies that can …
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Stereoscopic depth axis interaction: A study of performance and engagement in stereoscopic 3D games.
… 3D (S3D) creates the impression of depth (stereopsis) in at images by providing additional binocular depth cues, such as convergence and binocular disparity. In this thesis, we explore the effects that S3D has on the player experience in an attempt to uncover design methodologies that can …
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The Effects of Two-Dimensional and Three-Dimensional Stimuli on Spatial Representation in Drawings
… representation in drawings. Through the use of stereopsis, a scene was projected as both a two-dimensional image and as a three-dimensional image. Students wore polarizing glasses to enable them to perceive the superimposed images as a three-dimensional scene; whereas a single slide was …
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Perception and Eye Alignment Control: Do People Think the Same Way Their Brain Thinks?
… Conclusion: These results imply that both stereopsis and eye alignment may be impaired for individuals with unequal retinal image contrast, as for example in unilateral cataract or monovision prescription.
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