Störunempfindliche Bildübertragung: Walshtransformation Mit Flüssigkristall-Matrix
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Mit diesem Forschungsvorhaben wurden im wesentlichen zwei Ziele verfolgt: Zunächst sollten die Grundlagen für Darstellung und Verarbeitung ebener Leucht- dichte-Bilder aufgestellt und zum anderen eine möglichst einfache Apparatur ent- wickelt werden, die für die Umsetzung der Bildfunktion in elektrische Signale und deren Rückumsetzung in eine Bilddarstellung geeignet ist. Die heute gebräuchlichen Systeme zur Übertragung von Bildinformation (Fernsehen, Bild-Telegraphie, Faksimile) sind in ihrer technischen Ausführung zwar recht kom- pakt, dafür jedoch bezüglich der bereitzustellenden Übertragungskanäle (Bandbreite, Kanalkapazität) sehr anspruchsvoll. Es gibt daher in letzter Zeit umfangreiche Be- mühungen, geeignete Signalparameter zur Darstellung der sendeseitigen Bildinforma- tion zu gewinnen, auf deren Grundlage sich ein wenig aufwendiges Übertragungssystem realisieren lä t. Mögliche Verfahren zur Gewinnung solcher Parameter sind unter anderem die Prädiktions- und die Signaltransformationsverfahren. Durch die Prädiktion wird versucht, aus dem zur Zeit t bekannten Signalvedauf o (t to) zu schätzen und mit Hilfe dieser Schätzwerte o im wesentlichen eine Redundanzreduktion durchzuführen. Bei Anwendung von Transformationsverfahren wird das Signal zunächst in einen Spektralbereich (z. B. Fouriertransformation) überführt. Vor Übertragung dieses Spektralbereichs werden auf das Spektrum Verfahren zur Datenreduktion und Daten- sicherung angewendet. In diesem Forschungsvorhaben wurde eine einfache Apparatur entwickelt, die es ge- stattet, Bildfunktionen in den Spektralbereich zu transformieren und diesen in elektri- sche Signale umzusetzen. Durch geringe Änderung der Apparatur kann auch die inver- se Operation (elektrische Signale ----0> Spektralbereich Bildfunktion) durchgeführt werden.
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