DSpace Kolekce:
http://hdl.handle.net/11025/1610
2024-03-28T17:24:27ZNew Fingerprint Image Enhancement Using Directional Filter Bank
http://hdl.handle.net/11025/15445
Název: New Fingerprint Image Enhancement Using Directional Filter Bank
Autoři: Oh, Sang Keun; Lee, Joon Jae; Park, Chul Hyun; Kim, Bum Soo; Park, Kil Houm
Editoři: Skala, Václav
Abstrakt: This paper describes a new method of directional filter-based analysis for fingerprint enhancement. Fingerprint images can be represented by a directional field of regular structure of ridge patterns. The dominant directional component of ridge plays a very important role in the pre-processing steps of fingerprint image analysis such as ridge's linking and noise removal for minutiae extraction. A directional filter bank analyzes an input image into directional subband images and synthesizes them to the perfectly reconstructed image. In this paper, a new fingerprint enhancement algorithm based on a directional filter bank is proposed. The algorithm decomposes a fingerprint image into directional subband images in the analysis stage, processes the subband images in the processing stage, and reconstructs them as the enhanced image in the synthesis stage. The experiment results show that the proposed method reduces the influence of noise on the ridges and valleys, enhances the ridge’s moving shape, and preserves the spatial characteristics at minutiae and singular points.2003-01-01T00:00:00ZOh, Sang KeunLee, Joon JaePark, Chul HyunKim, Bum SooPark, Kil HoumEdge-enhancement: an algorithm for real-time
http://hdl.handle.net/11025/1689
Název: Edge-enhancement: an algorithm for real-time
Autoři: Nienhaus, M.; Doellner, Juergen
Editoři: Skala, Václav
Abstrakt: In this paper, we propose an algorithm for enhancing edges of real-time non-photorealistic renderings. It is based
on the edge map, a 2D texture that encodes visually important edges of 3D scene objects, and includes silhouette
edges, border edges, and crease edges. The edge map allows us to derive and augment a wide range of nonphotorealistic
rendering styles. Furthermore, the algorithm is designed to be orthogonal to complementary realtime
rendering techniques. The implementation is based on multipass rendering: First, we extract geometrical
properties of 3D scene objects generating image-space data similar to G-buffers. Next, we extract discontinuities
in the image-space data using common graphics hardware to emulate image-processing operations. In subsequent
rendering passes, the algorithm applies texture mapping to combine the edge map with 3D scene objects.2003-01-01T00:00:00ZNienhaus, M.Doellner, JuergenInteractive animation of cloth including self collision
http://hdl.handle.net/11025/1688
Název: Interactive animation of cloth including self collision
Autoři: Fuhrmann, Arnulph; Groß, Clemens; Luckas, Volker
Editoři: Skala, Václav
Abstrakt: We describe a system for interactive animation of cloth, which can be used in e-commerce applications, games
or even in virtual prototyping systems. In order not to restrict the shape of the cloth we use a triangulated mesh,
which serves as basis of a mass-spring system. For the animation of the particles internal and external forces are
considered. Since cloth is a very rigid material when stretched, extremely large forces occur in such a system.
Several methods have been described in the recent years to solve the underlying differential equations efficiently.
We describe an algorithm which replaces the internal cloth forces by several constraints and therefore can easily
take large time steps. These constraints can be parameterized to generate different behavior of the simulated cloth.
Furthermore we provide an algorithm for an efficient avoidance of self collisions. For these reasons very plausible
animations of cloth at interactive rates are possible with our system.2003-01-01T00:00:00ZFuhrmann, ArnulphGroß, ClemensLuckas, VolkerBlob-representation of multidimensional objects and surfaces
http://hdl.handle.net/11025/1687
Název: Blob-representation of multidimensional objects and surfaces
Autoři: Herman, Gabor T.; Garduño, Edgar
Editoři: Skala, Václav2003-01-01T00:00:00ZHerman, Gabor T.Garduño, Edgar