|
|
Pattern Matching in Digital Images
Šramko, Samuel ; Mráček, Štěpán (referee) ; Orság, Filip (advisor)
This work deals with pattern matching in digital images. It describes theoretical presumptions for matching using template matching and SURF algorithms and their following use in solving correspondence problem. Work also describes design, implementation and testing phase of application, which uses aforesaid algorithms written in C++ language with OpenCV and Qt libraries. At the end this thesis describes format of tests and summarize obtained results.
|
|
|
Development of dentition in the x-ray image
STOKLASOVÁ, Martina
The topic of the bachelor thesis is to compare the quality of analogic and digital orthopantomograms. The accuracy and legibility of these x-ray photos is assessed via teeth dental age in different areas of mixed dentition at ten-year old children. Further, the thesis analyses the most commont mistakes made when orthopantomogram is taken. In the theoretic part of the thesis the anatomy is described, the development of teeth and teeth marking. Next, the thesis focuses on dental age assessing at grown ups and its methods. Further, the theoretical part describes in detail x-ray machines and techniques in stomatology. The x-ray photos of children and their preparation is a special part of the thesis. The practical part of the thesis formulates goals and research questions. A file and a metodology, which are used in the research are descibed. The dental age is assessed according to a method proposed by Kominek and Rozkovcova, 1984. This method lies in compartmentalization of a developing dental germ of 7 developing stages corresponging with a specific age period. A permanent and a temporary dentures are assessed in schemes and tables and devided according to the development stage of a child. The research of the thesis lied in assessing and comparing of dental age within a file of 100 children with mixed dentition at the age of ten years. The file comprised 50 randomly chosen analogic photos and 50 digital photos. Further, technical mistakes at the photos and the their reasons were assessed and analyzed. The thesis descibes examples of assessing both of analogic photos and digital photos and the mistakes which inable the dentition development assessing. Its clear that digital photos is more accurate and of a higher quality. Thus, its suprising how many mistakes were found on the chosen photos. From today's point of view, analogic photos are a past. Analogic photos showed frequent flaws in quality, such as insufficiant photos development causing artefacts, over- and underlighting, insufficiant settling on the photos. A disadvantage of this way of development were also huge area demands for development of an analogic photos and the necessity of storing of chemicals and films. Paradoxically, in the results of the thesis more mistakes were found on digital rather than on analogic photos in a random choice, which seems a serious problem to me because modern digital methods cannot be compared to history photos as far as their technical possibilities are concerned. When assesing the accuracy of results of the dental age of children, we can find out how many photos can be assessed and how many not. On 20 randomly chosen digital and 20 analogical photos an analysis of the most common mistakes in orthopantomographs was carried out. For the analysis of the mistakes on the photos a frontal part of the denture was chosen, which is the area of the cutters where the most mistakes were cause by incorrect setting of the children's head in the x-ray machine. On 20 analogical photos, 35% of the children were placed in the machine incorrectly, on 20 digital photos the result was 25% of the children. When comparing analogical and digital photos, no difference was found when assessing the dental age. The discussion shows the importance of making orthopantomograph in a high quality at children in the period of denture change and the most common mistakes are commented on. In conclusion, the problematics of orthopantomograph making was summed up, where the most common flaws when making x-ray photos at children were pointed out. These flaws lead to diagnostic inaccuracies. The importance of correct placing of the child when x-ray making was stressed, which was not adhered to at 55% of the children patients whose photos I assessed. This fact is to be taken very seriously because it is an invasive checkup.
|
|
|
Pattern Matching in Digital Images
Šramko, Samuel ; Mráček, Štěpán (referee) ; Orság, Filip (advisor)
This work deals with pattern matching in digital images. It describes theoretical presumptions for matching using template matching and SURF algorithms and their following use in solving correspondence problem. Work also describes design, implementation and testing phase of application, which uses aforesaid algorithms written in C++ language with OpenCV and Qt libraries. At the end this thesis describes format of tests and summarize obtained results.
|
|
|
The process of preparing photographic data for the presentation of commercial goods
Andriychuk, Nazar ; Šedivá, Zuzana (advisor) ; Pour, Jan (referee)
In this thesis I describe and analyze the process behind creating commercial photographs. The theoretical part overviews the basic terms of digital and analogue graphics, the most frequent forms of its distribution and the necessary requirements connected with creating it. Furthermore, the process model of preparing photographic data is analyzed, including the description of the different phases of the process and the benefits of dividing the process in phases. The practical part focuses on putting the model into practice and making sure all the criteria briefed by a client are respected in the final outcome.
|
guest ::
