PURPOSE:. To determine the effects of blurring vision on whole-body center-of-mass (CM) dynamics and foot-clearance parameters in elderly individuals performing a single step up to a new level. METHODS:. Twelve healthy subjects (mean age, 72.3 +/-4.17 years) performed a single step up to a new level (heights of 73 and 146 mm). Trials were undertaken with vision optimally corrected and with vision diffusively blurred by light-scattering lenses (cataract simulation). CM and foot-clearance parameter data were assessed by analyzing data collected by a five-camera, three-dimensional (3-D) motion analysis system. RESULTS:. When vision was blurred, subjects took 11% longer to execute the stepping task (P < 0.05), mediolateral displacement of the point of application of the ground reaction force vector (i.e., weighted average of all pressures over the area in contact with the ground; the so called center of pressure, CP) decreased from 37.6% of stance width to 28.3% (P < 0.01), maximum distance between the mediolateral position of the CM and CP decreased by 9.8 mm (P < 0.01), and toe clearance (distance between tip of shoe and edge of step) increased in both the horizontal (28%) and vertical (19%) direction (P < 0.05). CONCLUSIONS:. These findings suggest that when vision was blurred, subjects used a twofold safety-driven adaptation: First, to increase dynamic stability they ensured that the horizontal position of their CM was kept close to the center of the base of support and second, they increased horizontal and vertical toe clearance while swinging their lead limb forward to reduce the risk of tripping.

An iterative solution to the problem of blind image deconvolution is presented whereby a previous image estimate is explicitly used in the new image estimation process. The previous image is pre-filtered using an adaptive, non-parametric stabilizing function that is updated based on a current error estimate. This function is experimentally shown to dramatically benefit the convergence rate for the a priori restoration case. Noise propagation from one iteration to the next is reduced by the use of a second, regularizing operator, resulting in a hybrid iteration technique. Further, error terms are developed that shed new light on the error propagation properties of this method and others by quantifying the extent of noise and regularization error propagation. Optimal non-parametric, frequency adaptive stabilizing and regularization functions are then derived based on this error analysis. / Thesis / Master of Engineering (ME)

Yes / This article reviews the literature on how blurred vision contributes to falls, gait, and postural control and discusses how these are influenced by spectacle correction. Falls are common and represent a very serious health risk for older people. They are not random events as studies have shown that falls are linked to a range of intrinsic and extrinsic risk factors. Vision provides a significant input to postural control in addition to providing information about the size and position of hazards and obstacles in the travel pathway and allows us to safely negotiate steps and stairs. Many studies have shown that reduced vision is a significant risk factor for falls. However, randomized controlled trials of optometric interventions and cataract surgery have not shown the expected reduction in falls rate, which may be due to magnification changes (and thus vestibuloocular reflex gain) in those participants who have large changes in refractive correction. Epidemiological studies have also shown that progressive addition lens and bifocal wearers are twice as likely to fall as non-multifocal wearers, laboratorybased studies have shown safer adaptive gait with single-vision glasses than progressive addition lenses or bifocals, and a randomized controlled trial has shown that an additional pair of distance vision single-vision glasses for outdoor use can reduce falls rate. Clinical recommendations to help optometrists prevent their frail, older patients from falling are suggested. / Grant support: Atkinson Charitable Foundation, College of Optometrists, Dunhill Medical Trust, Essilor International R&D, Federation of Ophthalmic & Dispensing Opticians, Health & Welfare Canada, Health Foundation, National Institute for Health Research, PPP Foundation, and Vicon Motion Systems Ltd.

Background: Gender Variance (GV) is an experience that the gender assigned at birth is different to one’s preferred gender identity. It includes the possibility of a preferred gender identity being different to either male or female. It is reported that around 4000 people per year access care from the NHS in relation to GV (Gender Identity Research and Education Society (GIRES), 2009) and both the physical and psychological elements of these experiences is well documented. However, little research specifically explores how Gender Variant (GVt) people make sense of their experiences and construct meaningful expression of their preferred identity. The aim of this study is to further the understanding of GV with a view to considering the implications for service provision to this population. Methodology: The study employed a qualitative method that explored the narratives of the participants. A purposive sample of seven participants self identified as GVt was recruited for a single interview. The interviews used a topic guide to elicit the narratives that these people tell about their experiences. All interviews were audio-recorded, transcribed, and analysed using a narrative approach to explore what the participants said and the way they said it. This was then situated within the local and broader social contexts within which the narratives exist. Analysis and findings: The findings are presented through a global impression of each of the individual narratives and then through discussion of the similarities and differences in relation to the collective storylines. Particular attention is paid to the identity construction and the emotional experiences that take place during the interviews. These two elements are told within and through each of the storylines. The local and wider narratives available to the participants are used to contextualise the analysis and findings, and so are reported within the analysis. The analysis offers the following findings: i) their first experiences of understanding GV was important, leading them to find others who felt the same to gain a sense of hope of a normal life ii) sharing their experiences with others was an anxiety provoking time and was part of a decision making process about treatment and establishing an acceptable gender expression iii) relationships with family, friends, peers and members of their social context influence sense making and identity constructions of GVt people and typify the challenges faced within their GVt experiences. Some of these challenges were reported as ongoing and illustrated throughout the stories of the day to day lives of the participants iv) for these participants distressing emotional challenges were often situated in the past and participants spoke of ‘overcoming’ challenges. This offered a counter to the more dominant isolation and loneliness narratives within the literature on GVt experiences The findings of the study are discussed in relation to its clinical implications, the strengths and limitations of the methodology, and directions for future research.

This thesis presents a method for dynamic characterization of MEMS structures and discuses parameters that affect its measurements and techniques to improve them. Current methods of non-contact, laser based vibration measurement require special and expensive instruments. The method used in this thesis on the other hand, relies on Fast Fourier Transform analysis of blurred images captured using conventional cameras. The Fourier series analysis and transformation are introduced. Basic concepts of blur image analysis and associated technical terms are described. Step by step data extraction process for Fourier analysis of blurred images and results such as amplitude, attenuation, signal to noise ratio and Bessel curve are explained. Macro and micro scale experiments are designed and used to determine the effect and significance of different parameters on signal-to-noise ratio of extracted results. For this purpose geometrical parameters of macro scale combs such as length, width and duty cycle are varied across a considerable range and tests results are examined. In addition to the experiments, MATLAB code is used to model environmental effects such as addition of noise or changes of brightness. In micro scale experiments, extra patterns are created using Focused Ion Beam and etching process. Test and comparison of modified micro structures with unpatterned structures show improvement in signal to noise ratio especially in environments with high level of noise.

This research is concerned with how in/security is understood and the implications of contested meanings of in/security. The basic premise of this thesis is that in/security in itself has no meaning and thus cannot exist in isolation. Instead, in/security is always defined in relation to something or someone. How we understand in/security derives from the contexts we navigate and the identities we construct. An inquiry into in/security therefore demands incorporating a multiplicity of narratives and discussing these in relation to each other. While scholars have called for a greater emphasis on exploring in/security in marginal sites, I argue that accounts from the margins must not be at the exclusion of other more dominant narratives. Such analysis – placing the elite/margin, included/excluded, powerful/weak – in the same framework in order to produce a relational account of in/security is largely missing. This thesis sets out to provide a rich and detailed understanding of the everyday complexities of in/security. I propose a framework for capturing relational and contextual dimensions of in/security, and the implication of contested meanings of in/security understandings. Through an in-depth case study in the context of the transitions towards a post-conflict period in Colombia, following five decades of armed conflict, I inquired into in/security understandings at the margins in relation to the centre. The margins were represented by conflict-affected communities whereas the centre was represented by the Colombian government and key security sector institutions. The research found several relational dimensions of in/security understandings between the state- and the marginalized community-levels. Moreover, contextual and identity factors had a significant impact on how in/security was spoken about and what was spoken of. Through the framework, it was possible to see in continuum the way deeply ingrained understandings of in/security reproduce violence as the government seeks to transition the country into a post-conflict period following five decades of armed conflict. The research, through a detailed empirical case study, supports the view that in/security is relational and derivative of context and with ties to identity. It contributes to further our understandings of in/security at three distinct levels. At the theoretical level, the research builds upon existing literature in the field of security studies to advance an enhanced understanding of the relational and contextual dimensions of in/security, the contested meanings of in/security and the implications thereof. Methodologically, it proposes an alternative framework to capture the relational dimensions through shifting the problem formulation from a traditional focus on who is to be secured from what threats to how in/security is understood by different people/communities in different contexts. Empirically, it contributes to an off-centred understanding of in/security dynamics in the official transitions into the post-conflict period in Colombia. Through its empirical evidence it has the potential to offer an important contribution to the analysis of post-conflict transitions more generally.

<p>Motion blur is a form of image quality degradation, showing as content in the image smearing and not looking sharp. It is usually seen in photography due to relative motion between the camera and the scene (either camera moves or objects in the scene move). It is also seen in human vision systems, primarily on digital displays.</p> <p><br></p> <p>It is often desired to remove motion blurriness from images. Numerous works have been put into reducing motion blur <em>after</em> the image has been formed, e.g., for camera-captured ones. Unlike post-processing methods, we take the approach to prevent/minimize motion blur for both human and camera observation by pre-processing the source image. The pre-processed images are supposed to look sharp upon blurring. Note that, only pre-processing methods can deal with human-observed blurriness since the imagery can't be modified after it is formed on the retina.</p> <p><br></p> <p>Pre-processing methods face more fundamental challenges than post-processing ones. A problem inherent to such methods is the appearance of ringing artifacts which are intensity oscillations reducing the quality of the observed image. We found that these ringing artifacts have a fundamental cause rooted in the blur kernel. The blur kernel usually have very low amplitudes in some frequencies, significantly attenuating the signal intensity in these frequencies when it convolves an image. Pre-processing methods can usually reconstruct the targeted image to the observer but inevitably lose energy in those frequencies, appearing as artifacts. To address the artifact issue, we present a few approaches: (a) aligning the image content and the kernel in the frequency domain, and (b) redistributing their intensity variations elsewhere in the image. We demonstrate the effectiveness of our method in a working prototype, in simulation, and with a user study.</p>

Thesis (MPH.) -- University of Limpopo, 2021 / Dry eye disease (DED) is defined as a multifactorial disease of the tears and ocular surface that results in symptoms of discomfort, visual disturbance, and tear film instability with potential damage to the ocular surface. It is accompanied by increased osmolality of the tear film and inflammation of the ocular surface. DED is one of the most frequently established diagnoses in ophthalmology and represents a growing public health concern, with consequences that remain widely underestimated. There is variability of clinical manifestations and diagnostic criteria which leads to poor correlation between clinical signs and symptoms, therefore resulting in difficulties to assess prevalence of DED despite an improved understanding of pathogenic factors of acquired DED. However, its prevalence has been reported to range from 74% to 33% worldwide and the current study aimed to investigate the prevalence of DED and its determinants amongst people consulting at Focus Optometrists in Kwa-Mhlanga Township in Mpumalanga Province. Methodology: The current study was quantitative in nature and it followed a cross-sectional descriptive design to address the research question. The study population were people consulting at Focus Optometrists in Kwa-Mhlanga Township in Mpumalanga Province in which two standardized optometry diagnostic tests (Schimer test and the tear film break up time) were used for data collection coupled with a comprehensive case history which was taken for all participants. Data analysis was done using the STATA statistical software version 12 for Windows (STATA Corporation, College Station, Texas). Frequency tables were used to make comparisons between groups for continuous and categorical variables using student t-test, and chi-square test. P-value less than 0.05 at 95% confidence level were regarded as significant. Results: A total of 236 participants were recruited and the mean age of the participants was 39.7 in which majority of participants were females and there was a statistical significance difference in age groups of both males and females at p-value=0.011. Majority of the participants have reported to have experience of sensitivity to light vi and foreign body sensation sometimes. The poor vision and blurred vision have been reported by majority of participants sometimes and the prevalence of dry eye disease was found to be 80.9% and the risk of the dry eye disease in the current study was found significantly increasing with old age. Those who were older (35 years above) were 4.2 times more likely to develop dry eye disease at p-value <0.001 as compared to young participants. Female gender was found not to be protective of developing dry eye disease in the current and participants who were single, having secondary and education qualifications were more likely to develop dry eye disease. Participants with ocular conditions, systemic disease, surgery and those with high blood pressure were more likely to develop dry disease Conclusion: The prevalence of dry eye disease in the current study was found to be very high and therefore, patients coming to the clinic from the age of 40 with underlying systemic diseases should be screened for dry eyes. Dry eye disease can be a major contributor of refractive error in the visual systems and or can also be a sign or a symptom of hormonal or related ocular or systemic disease. More eye care awareness should be done at primary eye care level to detect the cause or to eliminate future associated symptoms.

Hur kan modeföretag genom sin kommunikation leva upp till sina koncept om könsneutralt mode? Under en längre tid har en debatt kring könsroller och könsuppdelning pågått, och modebranschens sätt att skildra män och kvinnor har kritiserats hårt. Modet framhäver vad som skiljer sig mellan det manliga och det kvinnliga alltmer, samtidigt som fler modeföretag börjar förmedla koncept om könsneutralt mode. Det är inte bara plaggen i sig som gör det svårt att könsöverskrida, media har även en stor påverkan, både på samhället som stort, och på individnivå. Vad konsumenter önskar se i media stämmer inte alltid med det företagen kommunicerar ut. Samhället strävar efter ökad genusmedvetenhet, jämställdhet och jämlikhet. För att en skillnad skall kunna ske krävs en förändrad inställning och en faktisk förändring, inte minst i modebranschen. En del forskare menar att kampanjer med representationer av icke stereotypiska könsroller spelar en positiv social roll för att en samhällsförändring gradvis skall ske. Vi har undersökt två utvalda företag som kommunicerar den typen av reklam och om deras butiker lever upp till de koncepten som de förmedlar i kampanjerna. Makt gestaltas i vad en bär för plagg. Åhléns ville med sin kampanj, Bryt Klädmaktsordningen , belysa förhållandet mellan kön, plagg och makt. Forskare menar att en kvinna klättrar upp i maktstegen om hon bär stereotypt maskulina plagg medan en man går ner i maktstegen. Samhället har accepterat att se kvinnan representera något som värderas lika högt som mannens plagg, vilket förknippas med dagens unisexmode. Hur skulle det se ut om rollerna byttes? Syftet med denna uppsats var att undersöka hur modebutiker genom sin kommunikation lever upp till sina koncept om könsneutralt mode samt föreslå hur företagen kan förbättra kommunikationen av begreppet könsneutralt mode till konsumenterna. För att kunna besvara syftet användes teoretiska modeller som identifierar vart det brister i kommunikationen som företagen försöker att förmedla till konsument. Det empiriska materialet bestod av två intervjuer, fyra fokusgrupper, observationer och pressmaterial. Först utfördes en intervju med en doktor i modevetenskap som också är idékläckare bakom Åhléns kampanj “Bryt klädmaktsordningen”. En intervju genomfördes med sekreteraren på transföreningen Full Personality Expression Sweden. Sedan fick vi en pressrelease utav projektledaren bakom &amp; Other Stories kampanj “The Gaze &amp; Other Stories”. Därefter lät vi våra fokusgrupper se samtliga kampanjfilmer och tolka vad för koncept kampanjerna förmedlar för att sedan diskutera kring hur företag kan leva upp till konceptets idé i deras fysiska butiker. Två observationer gjordes i de två respektive företagens butiker vars kampanjer vi utgått ifrån. Modebranschen är en av många olika sändare som utsätter oss för budskap och ideal, varför den blir mer synlig än andra branscher i fråga, handlar om att den är påtagligt mer synlig. Vi, ihop med alla respondenter hoppas på att en förändring är på väg, mot mer jämställdhet och jämlikhet, samt att den nya generationen som nu stiger in i branschen kommer att bidra till en förändring i vad som sänds ut genom de olika marknadsföringskanalerna. Viktigt att tänka på är att förändringar sker konstant, även inom modet. En förändring större än trender kommer att ske men frågan är: När? / Visual communication of gender neutral clothing within the fashion industryA study that examines whether chosen companies live up to the concept of gender neutral fashion. How can fashion companies through their communication live up to their concepts of gender neutral fashion? During a longer period of time there has been a debate on gender roles and segregation of genders, also within the fashion industry. The way it divides and depicts the differences between men and women has been criticized for a long time. A change is coming, there are more and more fashion companies that mediate concepts of gender neutral fashion within their communication. What consumers wish to see when it comes to the way fashion companies communicate concepts about gender neutral fashion do not often accord with the way they are actually communicating it. The concepts are not cohesive, the way it is displayed in their communication does not match what you are exposed to in their stores. Our society strives for an increase of gender awareness, gender equality and equality. In order for a change to happen, a change of attitude and an actual alteration needs to happen, not at least in the fashion industry.

High quality image /video has become an integral part in our day-to-day life ranging from many areas of science, engineering and medical diagnosis. All these imaging applications call for high resolution, properly focused and crisp images. However, in real situations obtaining such a high quality image is expensive, and in some cases it is not practical. In imaging systems such as digital camera, blur and noise degrade the image quality. The recorded images look blurred, noisy and unable to resolve the finer details of the scene, which are clearly notable under zoomed conditions. The post processing techniques based on computational methods extract the hidden information and thereby improve the quality of the captured images. The study in this thesis focuses on deconvolution and eventually blind de-convolution problem of a single frame captured at low light imaging conditions arising from digital photography/surveillance imaging applications. Our intention is to restore a sharp image from its blurred and noisy observation, when the blur is completely known/unknown and such inverse problems are ill-posed/twice ill-posed. This thesis consists of two major parts. The first part addresses deconvolution/blind deconvolution problem using Bayesian approach with fuzzy logic based gradient potential as a prior functional. In comparison with analog cameras, artifacts are visible in digital cameras when the images are enlarged and there is a demand to enhance the resolution. The increased resolution can be in spatial, temporal or even in both the dimensions. Super resolution reconstruction methods reconstruct images/video containing spectral information beyond that is available in the captured low resolution images. The second part of the thesis addresses resolution enhancement of observed monochromatic/color images using multiple frames of the same scene. This reconstruction problem is formulated in Bayesian domain with an aspiration of reducing blur, noise, aliasing and increasing the spatial resolution. The image is modeled as Markov random field and a fuzzy logic filter based gradient potential is used to differentiate between edge and noisy pixels. Suitable priors are adaptively applied to obtain artifact free/reduced images. In this work, all our approaches are experimentally validated using standard test images. The Matlab based programming tools are used for carrying out the validation. The performance of the approaches are qualitatively compared with results of recently proposed methods. Our results turn out to be visually pleasing and quantitatively competitive.