Syfte: Att ta fram en metod för att hjälpa mindre sågverk att bättre tillvarata mesta möjliga virke från en timmerstock. Metod: En kvantitativ studie där tre iterationer genomförts enligt Design Science. Resultat: För att skapa en effektiv algoritm som ska utföra volymberäkningar i ett punktmoln som består av cirka två miljoner punkter i ett industriellt syfte ligger fokus i att algoritmen är snabb och visar rätt data. Det primära målet för att göra algoritmen snabb är att bearbeta punktmolnet ett minimalt antal gånger. Den algoritm som uppfyller delmålen i denna studie är Algoritm C. Algoritmen är både snabb och har en låg standardavvikelse på mätfelen. Algoritm C har komplexiteten O(n) vid analys av delpunktmoln. Implikationer: Med utgångspunkt från denna studies algoritm skulle det vara möjligt att använda stereokamerateknik för att hjälpa mindre sågverk att bättre tillvarata mesta möjliga virke från en timmerstock. Begränsningar: Studiens algoritm har utgått från att inga punkter har skapats inuti stocken vilket skulle kunna leda till felplacerade punkter. Om en stock skulle vara krokig överensstämmer inte stockens centrum med z-axelns placering. Detta är något som skulle kunna innebära att z-värdet hamnar utanför stocken, i extremfall, vilket algoritmen inte kan hantera. / Purpose: To develop a method that can help smaller sawmills to better utilize the greatest possible amount of wood from a log. Method: A quantitative study where three iterations has been made using Design Science. Findings: To create an effective algorithm that will perform volume calculations in a point cloud consisting of about two million points for an industrial purpose, the focus is on the algorithm being fast and that it shows the correct data. The primary goal of making the algorithm quick is to process the point cloud a minimum number of times. The algorithm that meets the goals in this study is Algorithm C. The algorithm is both fast and has a low standard deviation of the measurement errors. Algorithm C has the complexity O(n) in the analysis of sub-point clouds. Implications: Based on this study’s algorithm, it would be possible to use stereo camera technology to help smaller sawmills to better utilize the most possible amount of wood from a log. Limitations: The study’s algorithm assumes that no points have been created inside the log, which could lead to misplaced points. If a log would be crooked, the center of the log would not match the z-axis position. This is something that could mean that the z-value is outside of the log, in extreme cases, which the algorithm cannot handle.

The aim of this thesis is to design an automated scanning system for components for the purpose of inspecting their dimensions and tolerances. The theoretical introduction provides the reader with basic information on the topic of 3D scanning. The work also includes the design of own scanning system. The greatest attention is paid to the design of a program using the PCL library. The aim of the program is automatic processing of data from a 3D scanner and evaluation of the required dimensions of the scanned component. The final part of the work is devoted to testing the proposed solution.

Made available in DSpace on 2015-04-16T15:23:35Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 3617160 bytes, checksum: c660f429ed2d8d26d91b1ecfa9daad2c (MD5) Previous issue date: 2014-08-27 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / Once the noteworthy role of public libraries as institutions in the development process is recognized, the current piece of research had as general objective the analysis of free tools for the development of digital libraries describing thus their use. The research development was divided into four phases. The first one, named preparation, intended to identify the elements used by digital libraries which are accessible by means of web, following a set of criteria, characterized by the sample that was composed of eighteen libraries in the Portuguese language. In this phase, a quantitative/qualitative methodological approach was used. Data collection was carried out through techniques such as content analysis, documental analysis and questionnaire use so as to validate the mentioned analysis. In relation to the second phase, named planning, the choice of the technological elements available for the implementation of a digital library was fulfilled. For data collection, the documental analysis was used. The third one, the development, was composed of activities concerning a prototype development of a public digital library as well as the description of its construction procedures. Finally, in the fourth phase, the control, the use and the users´ impression of the developed library were measured and analyzed. For data collection, the webometric analysis and the on-line questionnaire answered by the users were employed. As the research was developed, it was verified that there is no standard model for digital libraries that are in their operational process, different from the traditional ones, being highlighted that there is disparity in the observed characteristics. In regard to archive policy, the research realized that the digital libraries do not have it or they are not documented. The lack of the professional librarian, in these information units, was also emphasized. With reference to the tools, the available diversity in the web allows any traditional library, with the suitable skilled human resources, to be part of the technological world without great difficulties. The metrics employed to measure the prototype use perceived numbers that allow identifying the users´ access and satisfaction. As final result, this research indicates alternatives for the librarians and managers of information units demonstrating thus procedures that enable free access to quality and democratic information, without burdening the institution´s budget. / Reconhecendo o relevante papel das bibliotecas públicas como instituições no processo de desenvolvimento, o presente trabalho teve como objetivo geral analisar ferramentas livres ou gratuitas para o desenvolvimento de bibliotecas digitais descrevendo sua aplicação. O desenvolvimento do trabalho se dividiu em quatro fases. A primeira, denominada preparação, buscou identificar os elementos utilizados por bibliotecas digitais acessíveis pela Web, seguindo um conjunto de critérios, caracterizado pela amostra que foi composta de dezoito bibliotecas em língua portuguesa. Nesta fase, utilizou-se uma abordagem metodológica quanti-qualitativa. A coleta de dados foi realizada com técnicas de análise de conteúdo, análise documental e aplicação de questionário para validar a referida análise. Para a segunda fase, denominada planejamento, deu-se a escolha dos elementos tecnológicos disponíveis para a implementação de uma biblioteca digital. Para a coleta dos dados, utilizou-se a análise documental. A terceira fase, o desenvolvimento, foi composta pelas atividades de desenvolver um protótipo de biblioteca digital pública, e descrever seus procedimentos de construção. Por fim, na quarta fase, o controle, buscou-se medir e analisar o uso e a impressão dos usuários da biblioteca desenvolvida. Para a coleta dos dados, utilizou-se da análise Webométrica e de questionário on-line aplicado com os usuários. Com o desenvolvimento da pesquisa, verificou-se que não existe um modelo padrão para as bibliotecas digitais que estão operacionais, diferente do que existe nas tradicionais, evidenciando que há uma disparidade das características verificadas. Quanto à política de acervo, a pesquisa constatou que as bibliotecas digitais não possuem ou não estão documentadas. Evidenciou-se, também, a falta do profissional bibliotecário a frente dessas unidades digitais de informação. Acerca das ferramentas, a diversidade disponível na Web permite a qualquer biblioteca tradicional, com os recursos humanos devidamente preparados, se inserir no mundo tecnológico sem grandes dificuldades. As métricas aplicadas para medir a utilização do protótipo constataram números que permitem identificar perfil, o acesso e a satisfação dos usuários. Como resultado final, esta pesquisa indica alternativas para os bibliotecários e gestores de unidades de informação, demonstrando procedimentos que permitem dar acesso gratuito à informação de qualidade e democrática, sem onerar o orçamento da instituição.

A highly accurate sensor for measuring distances, used for creating high-resolution 3D maps of the environment, utilize “Light Detection And Ranging” (LiDAR) technology. This degree project aims to investigate the implementation of 3D LiDAR sensors into off-highway vehicle display computers, called CCpilots. This involves a study of available low-cost 3D LiDAR sensors on the market and development of an application for visualizing real time data graphically, with room for optimization algorithms. The selected LiDAR sensor is “Livox Mid-360”, a hybrid-solid technology and a field of view of 360° horizontally and 59° vertically. The LiDAR application was developed using Livox SDK2 combined with a C++ back-end, in order to visualize data using Qt QML as the Graphical User Interface design tool. A filter was utilized from the Point Cloud Library (PCL), called a voxel grid filter, for optimization purpose. Real time 3D LiDAR sensor data was graphically visualized on the display computer CCpilot X900. The voxel grid filter had a few visual advantages, although it consumed more processor power compared to when no filter was used. Whether a filter was used or not, all points generated by the LiDAR sensor could be processed and visualized by the developed application without any latency.

Diplomová práce je zaměřena na problematiku detekce a sledování polohy hlavy v obraze jako jednu s možností jak zlepšit možnosti interakce mezi počítačem a člověkem. Hlavním přínosem diplomové práce je využití inovativních hardwarových a softwarových technologií jakými jsou Microsoft Kinect, Point Cloud Library a CImg Library. Na úvod je představeno shrnutí předchozích prací na podobné téma. Následuje charakteristika a popis databáze, která byla vytvořena pro účely diplomové práce. Vyvinutý systém pro detekci a sledování polohy hlavy je založený na akvizici 3D obrazových dat a registračním algoritmu Iterative Closest Point. V závěru diplomové práce je nabídnuto hodnocení vzniklého systému a jsou navrženy možnosti jeho budoucího zlepšení.