Apparatus for transfer of film to video

H - Electricity – 04 – N

Patent

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Details

H04N 5/253 (2006.01) H04N 5/257 (2006.01) H04N 7/01 (2006.01)

Patent

CA 2260239

An apparatus is disclosed for use in a method for scanning an image on a film and generating a video signal therefrom, the apparatus comprising a signal processor (10) receiving a plurality of input raster lines representing a film image, and control means (11) having controls (14) operating on said signal processor whereby the number of said input raster lines used by the signal processor in the active raster to generate said output signal is variable. A signal representing a sequentially scanned image is supplied to filter (12) which performs an anti-aliasing and a decimation process. The amount of oversampling can be varied depending on various factors, such as film speed, and degree of anti-aliasing and aperture correction so as to optimise performance and, in CRT-based systems, so as to maintain the size of the raster on the face of the CRT above a predetermined minimum.

L'invention concerne un dispositif à utiliser dans un procédé de balayage d'une image de film et à générer un signal vidéo à partir de ladite image. Ce dispositif comprend un processeur de signaux (10) recevant une pluralité de lignes de trame d'entrée représentant une image de film, ainsi que des moyens de commande (11) possédant des commandes (14) fonctionnant sur ledit processeur de signaux, le nombre desdites lignes de trame d'entrée utilisées par le processeur de signaux dans la trame active afin de générer ledit signal de sortie étant variable. Un signal représentant une image balayée de façon séquentielle est envoyé à un filtre (12) assurant une opération d'antirepliement et de décimation. On peut modifier le niveau du suréchantillonnage en fonction de différents facteurs, tels que la vitesse de défilement du film, ainsi que le degré d'antirepliement et de correction d'ouverture, de manière à optimiser l'efficacité et, dans les systèmes à base de tube cathodique, de maintenir la dimension de la trame sur la face du tube cathodique au-dessus d'un minimum prédéterminé.

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