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 21 for “"Sensitivity Function"”.
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The effects of target vibration on the human contrast sensitivity function
… vibration on visual acuity. The human contrast sensitivity function (CSF) has also been studied extensively as a predictor of visual performance under real-world conditions. However, no previous studies have combined the two lines of research and examined the effect of vibration on the CSF. …
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The effects of target orientation on the dynamic contrast sensitivity function
… orientation on visual acuity. The contrast sensitivity function (CSF) also has been studied as a predictor of visual performance under dynamic conditions. However, no previous studies have combined these areas of research and examined the effect of target orientation on the Dynamic Contrast …
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Determination of Chromatic and Luminance Channels in the Zebrafish Visual System Using an Increment Threshold Technique
… From the ERG b-wave responses, a spectral sensitivity function was derived under low and high levels of white background. By examining spectral sensitivity functions under these two levels of white background adaptation, it was possible to determine if two functional channels exist for …
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Control of Multiple Degree of Freedom Fast Tool Stages for Noncircular Turning Process
… results in the squaring effect on the overall sensitivity function and improves the tracking performance. Experimental and simulation results show the effectiveness of the dual stage actuator system for the noncircular turning process. (3) A new discrete-time robust repetitive controller design …
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Temporal Characteristics of Zebrafish Cone Types and Their Role in Separate Visual Processing
… requirement of vertebrate vision. The spectral sensitivity functions (relative sensitivity to different wavelengths of light) of the separate mechanisms were determined in zebrafish using heterochromatic flicker photometry (HFP). The spectral sensitivity function of the luminance channel was …
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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.
… frequency bands. An evaluation of the contrast sensitivity function under defocus provides further evidence. Electrophysiological methods measure the effect of blur adaptation at the retina and at the visual cortex to provide objective evidence for the presence of the blur adaptation mechanism. …
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Fast Split Arithmetic Encoder Architectures and Perceptual Coding Methods for Enhanced JPEG2000 Performance
… weighting method based on the contrast sensitivity function (CSF). Recent literature shows that perceptual methods based on subband standard deviation are also effective in image compression. This research presents two new perceptual weighting methods that combine information from both …
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Personality and Relational Aggression in College Students: The Role of Social Anxiety and Rejection Sensitivity
… along with social anxiety and rejection sensitivity, function as predictors of relational aggression among college students. Hierarchical multiple regression were used to test hypotheses about the predictive utility of the FFM and whether the addition of social anxiety and/or rejection …
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The Venetian blind effect: Contrast disparity modulation in irradiation stereoscopy
… at threshold, and adjusted for the contrast sensitivity function. Sum and difference spikes, caused by phase changes between the half-images, appeared in the resulting Fourier plots. One parameter, two parameter, and three parameter models were generated to fit the Fourier results. The models …
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Design of Robust PID Controllers with Constrained Control Signal Activity
… loops is because it leads to control signal sensitivity of measurement noise. A frequently varying control signal with too high amplitude will very likely lead to actuator wear and tear. For this reason it is extremely important for any PID design method to take this into account. The …
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Development of video quality metrics based on psychovisual models of early vision
… of a multidimensional model of human contrast sensitivity appropriate to modern display technology of viewing conditions. The contrast sensitivity function works like a filter through which visual stimuli must pass to be perceived by the observer. Only video artefacts in the passband region can …
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Fundamentals of spatial vision in the barn owl (Tyto alba pratincola) : ocular aberrations, grating acuity, contrast sensitivity, and vernier acuity
… comparable conditions. The spatial contrast sensitivity function (CSF) of the barn owl was measured in several psychophysical experiments with an orientation discrimination task. As in humans and virtually any other animal, the CSF of the barn owl rendered the typical band-limited inverted …
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Relay Feedback and Multivariable Control
… stabilizing feedback that makes a weighted sensitivity function arbitrarily small. Implications on control structure design and sequential loop-closure are given. A novel multivariable laboratory process is also presented. Its linearized dynamics have a transmission zero that can be located …
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Wavelet-based Image Compression Using Human Visual System Models
… wavelet coefficients according to the contrast sensitivity function (CSF)---a model of humans' sensitivity to spatial frequency. This mask gives the most perceptible information the highest priority in the quantizer. The second component of our HVS model is called asymmetric compression. It is …
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Closed-loop analysis and feedback design in the presence of limited information
Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2013-05-26T10:00:23Z
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A Study of Perceptually Tuned, Wavelet Based, Rate Scalable, Image and Video Compression
… wavelet image compression technique, Contrast Sensitivity Function (CSF) for Human Visual System (HVS) and extends this scheme to handle optimal bit allocation among multiple bands, such as Y, Cb, and Cr. Our experimental image codec shows very exciting results in compression performance and …
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Differences in image properties across facial expressions: effects on perceived contrast, stimulus efficacy and oculomotor responses
… that fearful expressions exploit the contrast sensitivity function. Additionally, Experiments 4 and 5 explore these effects using continuous flash suppression (CFS) and saccadic latency (SL). Findings showed that CFS in particular is vulnerable to faces’ contrast content and spatial frequency …
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Decentralized control of sound radiation from periodically stiffened panels
… be expressed as the product of the complementary sensitivity function of the neighboring control unit multiplied by a term that quantifies the diagonal dominance of the plant. This understanding can be used to improve existing control strategies. For instance, decentralized performance can often …
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Cross sensitivity analysis of optical fibre-based sensing for high pressure, high temperature measurement in oil and gas applications.
… 300 °C. In this research, the effect of cross sensitivity on multi-parameter optical fibre sensor for oil and gas applications in harsh environments is studied and analysed. Mathematical models of the cross sensitivity function of fibre Bragg grating (FBG) and its physical mechanism has been …
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Understanding Chemotaxis in the Nematode Caenorhabditis elegans: From Molecules to Behavior
… begins with my contribution to a study of the function of ASE asymmetry in chemotaxis. I, along with another graduate student, found that an additional four salt ions (Br-, Li+/, I /, Mg2+) are sensed by either ASER (right) or ASEL (left) neurons. Evidence is presented that this laterality in …
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