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Lokale Gitteroptimierung für einen objektbasierten Bewegtbildcodec by Hornig, Holger

Lokale Gitteroptimierung für einen objektbasierten Bewegtbildcodec

by Holger Hornig
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Book cover type: Paperback
  • ISBN13: 9783838649610
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Diplom.de
  • Publisher Imprint: Diplom.de
  • Publication Date:
  • Pages: 100
  • Original Price: GBP 64.9
  • Language: German
  • Edition: N/A
  • Item Weight: 141 grams
  • BISAC Subject(s): Electrical

Inhaltsangabe: Einleitung: In der heutigen Zeit ist die Mobilität und ständige Erreichbarkeit zu einem wichtigen Teil unserer Lebensqualität geworden. Gerade im Bereich der Bildtelefonie müssen gro e Datenmengen bewältigt werden. Um vielen Nutzern diesen Dienst anbieten zu können, ist eine schmalbandige Übertragung notwendig. Die objektbasierte Bildcodierung nutzt logisch zusammenhängende Bildbereiche aus, um diese optimiert zu kodieren und zu übertragen. Dazu werden markante Punkte im Objekt gesucht, deren Position sich im folgenden Bild leicht wiederfinden lassen. Aus diesen Punkten wird ein Dreieckgitter gebildet, deren Inhalt einzelne Bildbereiche darstellen. Unter der Voraussetzung, dass sich die Punkte zwischen zwei Bildern nur wenig bewegen, kann das darauf folgende Bild mittels Analyse der Bewegungsvektoren und Morphing approximiert werden. In dieser Arbeit wird die Suche solcher markanten Punkte erläutert. Ferner werden zwei Verfahren und deren Optimierung zur vollständigen Triangulierung der Objekte gegenübergestellt und verglichen. Ein weiterer Bestandteil ist die optimierte Approximation von bekannten Konturen anhand von mehreren Fehlerkriterien. Inhaltsverzeichnis: Inhaltsverzeichnis: 1.Einleitung1 2.Beschreibung der Algorithmen3 2.1Definitionen3 2.2Aufbau der Datenstruktur6 2.3Suchen eines Objektes7 2.4Bestimmung der Konturpunkte8 2.4.1Hilfsalgorithmen9 2.5Bestimmung äu erer Triangulierungspunkte10 2.5.1Intervallmethode10 2.5.2Methode der besten Eckpunkte11 2.6Approximation der Konturkante12 2.7Berechnung innerer Triangulierungspunkte15 2.7.1Intervallmethode15 2.7.2Suche nach dem globalen Maximum16 2.7.3Eleminierung von ungültigen Punkten17 3.Triangulierungsalgorithmen19 3.1Äu ere Triangulierung mit Kurvendreiecken19 3.2Äu ere Triangulierung mit regulären Dreiecken22 3.3Keine äu ere Triangulierung22 3.4Greedy-Algorithmus23 3.4.1Optimiertes Greedy-Verfahren24 3.5Delaunay-Algorithmus25 3.5.1Voronoi-Zonen25 3.6Vervollständigu

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