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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.
1

Detekce malých změn objektů pomocí kamery / Detection of small object movements using camera

Udvardy, Bálint January 2020 (has links)
One of the basic problems in computer vision is motion detection and analysis in a given scene. This work focuses on detecting small changes in the image by using the moiré phenomenon. The main goal of this thesis is to detect different types of dislocations with algorithms used in computer vision. In this work synthetically created pictures are analysed, which were created with the mathematical model of a pinhole camera.
2

Apodizace Braggových vláknových mřížek vyráběných UV expozicí přes fázovou masku / Apodization of the fibre Bragg gratings by use of phase mask UV exposition

Burian, Tomáš January 2019 (has links)
This thesis describes the problem of fiber gratings, focusing primarily on the use of Bragg's grids in the sensor. It describes the types of fiber mesh production, especially the method of writing with a phase mask. The next part deals with the possibilities of using apodization in fiber optic systems. It deals with the various functions that can be used to describe apodization. The following part describes the moire principle, especially the method of overlapping two phase masks with a different period.
3

Bildanalys inom Machine Vision : Nyquists samplingsteorem vid digital fotografering

Lindström, Mattias January 2017 (has links)
Inom Machine Vision är det av stor vikt att kameran har möjlighet att detektera de detaljer som eftersöks. Aliasing är ett problem inom all digital fotografering och beror på att kamerans upplösning är för låg i förhållande till de detaljer den försöker fånga. Det här arbetet analyserar kamerans begränsningar och orsaken till dessa. En enkel kamerarigg som används till försök inom Machine Vision konstrueras om från grunden för bättre kontroll och upplösning och en ny styrning skapas till denna efter beställarens specifikationer. Ett testmönster för ISO 12233:2000 fotograferas därefter i denna rigg. Resultatet analyseras och jämförs mot Nyquists samplingsteorem med avseende på digital fotografering. Resultatet visar hur kamerans konstruktion och sätt att registrera färger genom ett filter framför bildsensorn och algoritmer för att beräkna färgen för varje enskild bildpunkt höjer sampelstorleken med en faktor 3 jämfört med det ursprungliga teoremet om dubbla samplingsfrekven-sen. / Within Machine Vision, it is very important that the camera can detect the details requested. Aliasing is a problem in all digital photography, and is because the camera's resolution is too low relative to the details it tries to capture. This work analyzes the camera's limitations and the cause of these. A simple camera rig used for Machine Vision tests is re-designed for better control and resolution, and a new control-system is created to this according to the client's specifications. A test pattern for ISO 12233: 2000 is then photographed in this rig. The result is analyzed and compared to Nyquist sampling theorem regarding digital photography. The result shows how the camera's design and way of registering colors through a filter in front of the image sensor and algorithms to calculate the color for each individual pixel increases the sample size by a factor of 3 compared with the original theorem with double sampling frequency.

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