File:Bildfunktion.svg

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Deutsch: Geometrische Darstellung der Abbildungsbeziehung eines Punktes P im Lochkameramodell zur Definition der Bildfunktion.

Ein Objektpunkt P wird durch das Projektionszentrum O unter dem Winkel tau zur Aufnahmerichtung in die Bildebene abgebildet und erzeugt den Punkt P'. Bei einer idealen Lochkamera bleibt die Richtung des Projektionsstrahls gleich und der Winkel tau und der Winkel tau' sind identisch. In diesem Fall ist die Bildfunktion definiert als:

tan(tau) = r/c => r = c * tan(tau).

Bei einer realen Kamera ändert sich i. d. R. jedoch die Richtung des Projektionsstrahls (durch Verzeichnung) und der Winkel tau' ist nicht gleich tau.
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Source Own work
Author Olaf Peters (OlafTheScientist)
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