Search the digital library catalog

Abstract: Symmetry is an essential feature of many geometric objects. However, the world also contains many asymmetrical or approximately symmetrical objects. Detecting approximate symmetries is a rather weakly defined problem, as computer-detected approximate symmetry may not correspond to human opinion. The situation is even worse if the symmetry is not global but local. This paper investigates whether approximate local reflection symmetries found by a computer in real data are acceptable for human observers. To answer this question, a new simple approximate local reflection symmetry detection is proposed and run on land cadastre data in the form of planar point sets. The resulting symmetries are subject to user tests to study human acceptance of approximate local symmetry. The results show a relatively good correlation between symmetry detected by computers and perceived by humans. This finding provides a solid foundation for integrating both approaches in specific applications. To achieve this, further research is needed on how to utilize specific aspects of human symmetry perception in computer solutions, so that computer symmetry detection can better approximate human perception.
Keywords: symmetry, geodata, computer graphics, human perception
Published in DKUM: 09.12.2025; Views: 0; Downloads: 1
Full text (2,36 MB)

Abstract: Modern textile and clothing manufacturers can today use the entire range of conventional CAD/CAM systems together with new computer graphics and Internet-based technologies in order to strengthen their position on the market, building a completely new electronic-business offer. Graphical presentation of textile products and processing, or visualisation, presents a promising technology that can be treated as a potential enrichment of conventional computer aided technologies used today by the majority of advanced producers of textile fabrics, clothing, and other textile products. The article presents the results of research on designing computer software for visualising the fabric dyeing process. The program package produced enables the effective visualisation of two fabric dyeing processes: a Pad-Batch machine line for dyeing flat textiles in open-width state, and an HT overflow dyeing machine for fabric dyeing in rope form. Graphical applications of both dyeing processes can be used for both industrial and educational purposes. In this article, we focus more on presenting the program structure and functionalities for using the software to support the education of textile students.
Keywords: visualisation, clothing manufacturing, CAD/CAM sistems, computer graphics
Published in DKUM: 31.05.2012; Views: 2575; Downloads: 31
Link to full text