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Meteorite detection system for widefield CCDs
Gomboš, Igor ; Krajíček, Václav (referee) ; Pelikán, Josef (advisor)
Lúthien is a software package designated to process astrographic images created by BOOTES, a Czech-Spanish robotic telescope system. As an extension to the RTS2 library, its purpose is to process large-sized astrographic images taken by a wide eld camera. Due to high storage cost, it is necessary to treat the input data in real time (20 to 30 seconds being the maximum). Apart from that, the software is open and easily extensible. The proposed solution offers three detection methods to choose from. The first one implements the Standard Hough transform. The other two are based on the Canny edge detector and simple region growing, respectively.
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Implementace algoritmů pro zpracovaní obrazu na IBM Cell
Klecanda, Václav ; Krajíček, Václav (advisor) ; Skrbek, Miroslav (referee)
This work summarize available information about IBM Cell/B.E. architecture to let the reader create a necessary overview for programming for this architecture. Practical information are based on development of an application that implements nontrivial image processing algorithm, sparse field level set segmentation. Next section contains description of the application development and associated problems solving. The work compares common and Cell B.E. architectures and describes conditions necessary for creation of an effective Cell/B.E. application. The work also contains brief procedure of the most important development tools installation. This procedure has to prepare everything necessary as fast as possible and thus to shorten the duration of the preparation phase to let the reader to start development.
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Volume data editor
Kavalík, Jiří ; Kolomazník, Jan (referee) ; Krajíček, Václav (advisor)
In the present work we want to design and implement simple tool for basic editing of volume data like resizing, rotating, tresholding retouching, which could be extended as needed. Currently, there are tools for volume data visualisation and simple editors for modding computer games with voxel-based graphics. There is not an editor with basic set of tools for editing volumes in resolution of medical scanners available to common user. The designed and implemented editor can run on common hardware and oth ers set of simple brushes and filters to the user and means to implement diferent tools as plugins for C# programmer.
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Interactive deformation of volume data
Talaš, Josef ; Kmoch, Petr (referee) ; Krajíček, Václav (advisor)
This thesis describes an implementation of 3D Chainmail Algorithm for volume data deformation. This algorithm is chosen after a comparison of several approaches to volume data deformation. This is not an algorithm suitable for physically plausible deformations, it is a compromise between performance, plausibility and simplicity. In another part of this thesis the algorithm is closely described. There is also analysed the possibility of algorithm parallelization using advanced Microsoft Parallel Extensions library. A part of this thesis is devoted to VL framework, which is in our program used to display volume data. The final program is tested on both real and artificial data. The target platform is Microsoft Windows operating system.
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User Interfaces for Editing Transfer Functions
Svoboda, Michal ; Krajíček, Václav (referee) ; Maršálek, Lukáš (advisor)
Visualization of volume data is nowadays still actual theme in computer graphics. The reason is a significant role of volume data in fields such as medicine, biology or simulation of physics experiments. In order to create informative visualizations of volume data, it is necessary to create so-called "transfer functions" that maps input values to a displayable quantity. Creating transfer functions is often difficult and lengthy process. Often considerable expertise is also required from the user. The aim of this work is to design user interface for creating and editing transfer functions, which would work as intuitively as possible. The basic requirement is a direct interaction between transfer function and displayed data. The result of this work is user interface, which does not put high demands on specialized knowledge of the user.
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Web-camera based interactive user input
Šedivý, Miroslav ; Krajíček, Václav (referee) ; Pelikán, Josef (advisor)
The goal of this thesis is to design and implement an interactive user input device for a PC, consisting of a web-camera scanning the gestures of the user's hand. The user will be wearing a special glove fixed with colored LED diodes to aid the image analysis process. Thesis concentrates on possible approaches to real-time image processing and interactive recognition of gestures. The ultimate goal is to substitute the basic functionality of the "computer mouse".
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Experimental System for Shadowing Algorithms
Skupien, David ; Krajíček, Václav (referee) ; Kmoch, Petr (advisor)
From the advent of computer graphics is rendering of cast shadows one of the basic methods to evoke an atmosphere and give an observer a realistic impression. It has been a very difficult task solved by specialized machines in the order of minutes not only in the past but also in the present. However, thanks to rapid progress of dedicated graphics hardware, it is easy now to master it even for interactive graphics. It has moved from simple geometric excuses on planar receivers to convincing shadow imitations. The aim of this thesis is to develop a graphical environment capable of comparing visual and efficiency properties of different methods specialized for shadow casting and subsequently implement some of them. Two algorithms have been chosen. The first one is a simple algorithm specialized for rendering shadows on planar receivers, the second one is an advanced algorithm called shadow volumes. Both are implemented in a basic and enhanced version and capable of achieving rates from tens to thousands of FPS.
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Digital Reconstructed Radiography
Chovanec, Andrej ; Krajíček, Václav (referee) ; Pelikán, Josef (advisor)
X-ray examination is an important part of the medical treatment. Despite all the advantages it introduces, it brings some limitations as well. In the present work we describe a technique that from the acquired CT data reconstructs a digital x-ray image and removes some drawbacks of traditional x-ray screening. Among the most significant improvements over the classical radiography belong generation of the screen from very arbitrary angle and interactive rotation of the image in real-time. In order to obtain the most realistic final image, we put the emphasis on the accurate simulation of physical properties of the x-ray radiation. We also try to get as low computational time needed to gain one image as possible. For this purpose we present a parallelization model that decomposes the required work of some components into several processors' cores and thus noticeably decreases the running time of the algorithm.
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Volume measurement in 3D data
Krajíček, Václav
Medical diagnostics using computed tomography or magnetic resonance is a common part of complex medical checkup for a long time. These devices produce vast volumes of data, which must be analyzed by an expert physician. There is a big space for utilising computers to aid medical diagnosis, or visualization. This work aims to measure volume of a specific organ in the human body, like kidneys or spleen. To measure volume of the organ it is necessary to reconstruct the object from three-dimensional data. Reconstruction is based on segmentation of the image data, which separates reconstructed organs from the background. The task of segmentation is specially adapted to this kind of data, which are, from specimen to specimen, characterized by big similarity in common shape, but also by big heterogeneity in tiny details. Deformable models were chosen as a primary tool for the segmentation of three-dimensional volumes. They are also the main topic of this work. Programs measuring volume in medical data exist, but thanks to increasing performance of modern computers it is possible to implement new algorithms, which are not present in today's software tools. The result of this work is a system which segments and measures volume in medical data. We also perform benchmarks, which expose an error of the measurement with...
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Volume measurement in 3D data
Krajíček, Václav ; Felkel, Petr (referee) ; Pelikán, Josef (advisor)
Medical diagnostics using computed tomography or magnetic resonance is a common part of complex medical checkup for a long time. These devices produce vast volumes of data, which must be analyzed by an expert physician. There is a big space for utilising computers to aid medical diagnosis, or visualization. This work aims to measure volume of a specific organ in the human body, like kidneys or spleen. To measure volume of the organ it is necessary to reconstruct the object from three-dimensional data. Reconstruction is based on segmentation of the image data, which separates reconstructed organs from the background. The task of segmentation is specially adapted to this kind of data, which are, from specimen to specimen, characterized by big similarity in common shape, but also by big heterogeneity in tiny details. Deformable models were chosen as a primary tool for the segmentation of three-dimensional volumes. They are also the main topic of this work. Programs measuring volume in medical data exist, but thanks to increasing performance of modern computers it is possible to implement new algorithms, which are not present in today's software tools. The result of this work is a system which segments and measures volume in medical data. We also perform benchmarks, which expose an error of the measurement with...
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