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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Analýza obvyklé doby pozorování specifických objektů řidičem / Analysis of the Usual Time of a Driver Observing Specific Objects

Fujačková, Hedvika January 2017 (has links)
This diploma thesis focuses on drivers of motor vehicles and the usual time they spend by specific objects. The theoretical part of the thesis brings an overview of literature on human perception. The eye-tracker is defined here as the instrument used for scanning the movements of the drivers eyes, here are also named its types and its applications in various fields of life. Finally, this part deals with the advertisements placed alongside roads acting as distractive elements. The experimental part builds upon the collected video recordings and offers an analysis of drivers’ observations of outdoor advertisements that attract their attention, mainly billboards.
22

Evoluce a význam barvy duhovky u člověka, její biologická role a mezikulturni percepce / The Evolution and Functional Role of the Colour of Iris in Humans, Its Biological Role, and Cross-Cultural Perception

Kočnar, Tomáš January 2021 (has links)
The human eye is a conspicuous and unique component of facial appearance. From other mammalian eyes it is set apart mainly by its unusual shape, visible white sclera, and a wide range of iris colours, which is something unique within a single species. Whether alone or in the context of the face as a whole, eye colour is an underexplored area within research into the perception of various personality traits. In this thesis, the author first reviews the physiological factors connected with eye colour and reported correlations between eye colour and different psychological and behavioural conditions. This is followed by an investigation of a possible relationship between eye colour and perceived dominance and attractiveness. The first and second study examines whether and to what extent eye colour is associated with facial morphology responsible for perceived dominance. The results are ambiguous. A cross-cultural comparison in the third study revealed that faces with blue eyes are judged as more attractive only in populations where individuals with darker eyes predominate. It is thus discussed whether this population-specific pattern is the consequence of a negative frequency-dependent selection that may have contributed to the present-day eye colour diversity. In short, the aim of this thesis was to...
23

Research of appropriate luminance level of monitor screens in workplace

Wang, Mengfei, Shu, Shiqi January 2023 (has links)
MÅL: Huvudsyftet med den här studien är att undersöka hur naturligt ljus påverkar det mänskliga ögats preferens för skärmens ljusstyrka när man tittar på en datorskärm. METODER: Tre experiment genomförs för att mäta i vilken utsträckning solljus förändrar bakgrundsljuset i form av solstrålning. Förexperimentet tar bilder med en kamera som simulerar detmänskliga ögat och en 27-tumsskärm för att simulerabakgrundsmiljön. Förexperimentet varierade skärmens ljusstyrka och efterexperimentet en RGB-bild i enfärgad färg för att få fram intensiteten av det ljus som kommer in i det mänskliga ögat under olika förhållanden. Kontrollförsöket ökade luminansintervallet till 10 och minskade ljusstyrkan till 5 nivåer från 60-100. Vi erhöll 2000 data om förhållandet mellan solljus och solstrålning för att förutsäga förändringen av ljuset i rummet när gardinerna dras för. Intervjutestade 16 vuxna som arbetar på Sogeti för att få fram deras preferenser för olika färger i olika bakgrundsbelysningsförhållanden. RESULTAT: Förexperimentet och kontrollexperimentet visade att varje färg har olika effekt på intensiteten av det ljus som avges av skärmens ljusstyrka när omgivningsljuset förändras. Intervjuresultaten visade att människor har olika preferenser för ljusstyrka. Mörka färger kräver högre ljusintensitet på skärmen när solstrålningen är 0:241, medan ljusa färger kräver lägre ljusintensitet på skärmen när solstrålningen är 430:751. SLUTSATSER: Den viktigaste idén är att upprätthålla ett visst förhållande mellan omgivningens ljusstyrka och skärmens ljusstyrka för att undvika visuell trötthet som orsakas av skärmen. Den här studien ger teoretiskt stöd till tillverkare av elektroniska apparater och ger referensutlåtanden för adaptiv justering av olika färger och ljusstyrka som visas på skärmar. / OBJECTIVE: The main goal of this study is to investigate the impact of natural light on the human eye's preference for screen brightness when viewing a computer screen. METHODS: Three experiments are conducted to measure the extent to which sunlight changes the background light in terms of solar radiation. The Pre-experiment takes pictures with a camera that simulates the human eye and a 27" monitor to simulate the background environment. Pre-experiment varied the brightness of the screen and post-screen of a solid color RGB image to obtain the intensity of light entering the human eye under various conditions. Control Experiment increased the luminance interval to 10 and reduced the brightness level to 5 levels from 60-100. We obtained 2000 data on the relationship between sunlight and solar radiation to predict the change in room light when curtains are drawn. Interview tested 16 adults working at Sogeti to obtain their preference for different colors in different background lighting conditions. RESULTS: Pre-experiment and Control Experiment showed that each color has a different effect on the intensity of light emitted by the screen brightness when the ambient light changes. Interview results showed that people have different preferences for brightness. Dark colors require higher screen light intensity when the solar radiation is 0:241, while bright colors require lower screen light intensity when the solar radiation is 430:751. CONCLUSIONS: The most important idea is to maintain a certain ratio of environmental brightness to screen brightness to avoid visual fatigue caused by the screen. This study provides theoretical assistance for electronic device manufacturers and provides reference opinions for adaptive adjustment of different colors and brightness displayed on screens.
24

Generation of Synthetic Retinal Images with High Resolution / Generation of Synthetic Retinal Images with High Resolution

Aubrecht, Tomáš January 2020 (has links)
K pořízení snímků sítnice, která představuje nejdůležitější část lidského oka, je potřeba speciálního vybavení, kterým je fundus kamera. Z tohoto důvodu je cílem této práce navrhnout a implementovat systém, který bude schopný generovat takovéto snímky bez použítí této kamery. Navržený systém využívá mapování vstupního černobílého snímku krevního řečiště sítnice na barevný výstupní snímek celé sítnice. Systém se skládá ze dvou neuronových sítí: generátoru, který generuje snímky sítnic, a diskriminátoru, který klasifikuje dané snímky jako reálné či syntetické. Tento systém byl natrénován na 141 snímcích z veřejně dostupných databází. Následně byla vytvořena nová databáze obsahující více než 2,800 snímků zdravých sítnic v rozlišení 1024x1024. Tato databáze může být použita jako učební pomůcka pro oční lékaře nebo může poskytovat základ pro vývoj různých aplikací pracujících se sítnicemi.
25

Systém pro sledování pohybu očí / System for Eye Movement Monitoring

Vojtíšek, Jiří January 2011 (has links)
This work deals with eye tracking systems and possibility of using them for control of many software or hardware devices. Project explains eye anatomy and electrophysiology, types of eye trackers and methods of eye tracking. We studied methods of image processing and image analyzing in LabVIEW development system and IMAQ Vision subsystem. On the base of these studies, we created whole eye tracking system .This system can be used for both the eye tracking from video recording and real time eye tracking. This system can monitor position or trajectory of look.
26

Fotobiologická bezpečnost světelných zdrojů a osvětlovacích soustav / Photobiological safety of light sources and lighting systems

Štěpánek, Jaroslav January 2014 (has links)
The thesis deals with the problems of the photobiological lamp and lamps systems safety. It is divided into theoretical and practical parts. The theoretical part touches the basic knowledge concerning the eye and vision, eye and skin diseases caused by excessive exposure to non-ionizing radiation. And besides that there are described the sources of light causing the possible exposure and further more it includes the methodology of measurement and evaluation of photobiological safety. The practical part investigates a measurement of the spectrum of light sources. The measured data are evaluated according to the methods mentioned in the theoretical part.
27

Software pro zpracování retinálních snímků / Software for retinal image processing

Magula, Filip January 2010 (has links)
This thesis deals with practical solutions of software for retinal images digital processing. The theoretic part describes human eye and retinal anatomy and also glaucoma disease. It is also focused on description of method for retinal nerve fiber layer enhancement and analysis. These enhancement are then used for designing of automated image processing. One chapter is devoted to detection and analysis of retinal nerve fibers layer. The practical part includes the user manual for application Image Blockz, which was established within this thesis. Further practical part contains the programmer's manual describing the basic structure of the program and its possible extensions.
28

Vliv prosklení na vnitřní mikroklima objektů / The influence of microclimate on the inside glass objects

Dvořáková, Hana January 2013 (has links)
This master thesis deals with the influence of glazing on the microclimate inside buildings. In particular, I focused on the shading coefficient and the various factors that affect it. The thesis also concentrates on the origin and composition of the solar radiation, the formation of thermal stress and refraction. In the next part of the thesis, I focused on designing two variants of shielding factor and its impact on the thermal load of gym, sports hall and the related necessary changes. The last part of the thesis deals with experimental measurements of incident solar radiation passing through the window into real physical model. From the measured values, we determined realistic shading coefficient and then applied it in the previous section of this thesis.

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