Video system with feedback controlled "white stretch"...

H - Electricity – 04 – N

Patent

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Details

H04N 5/57 (2006.01) H04N 5/20 (2006.01)

Patent

CA 2080605

A non-linear (e.g., "white stretch") processor and a brightness control processor are coupled in cascade between an input for receiving a video input signal to be processed and an output for providing a processed video output signal. A control signal for controlling the transfer characteristics of the non-linear processor is provided by an amplifier having a first input coupled to receive an average picture level (APL) indicating signal derived from the processed video output signal and having a second input coupled to receive a reference level signal supplied thereto. A brightness control signal is applied to a control input of the brightness control processor for controlling the brightness level of the processed video output signal. Circuit means are provided for deriving at least a portion of the reference level signal for the amplifier from the brightness control signal supplied to the brightness control processor thereby reducing a tendency for variations in the brightness control signal to alter the transfer characteristics of the non-linear processor.

Un processeur non linéaire et un processeur de commande de luminosité sont couplés en cascade entre une entrée de signaux vidéo à traiter et une sortie de signaux vidéo traités. Un signal de commande servant à contrôler les caractéristiques de transfert de ce processeur non linéaire est produit par un amplificateur ayant une première entrée couplée de façon à recevoir un signal obtenu du signal vidéo traité et indiquant le niveau moyen du signal vidéo, ainsi qu'une seconde entrée servant à recevoir un signal indiquant le niveau de référence. Un signal de commande de luminosité est transmis à une entrée de commande du processeur de commande de luminosité pour commander le niveau de luminosité du signal vidéo traité. € l'intention de l'amplificateur, un circuit extrait du signal de commande de luminosité fourni au processeur de commande de luminosité une partie au moins du signal de niveau de référence, ce qui réduit les altérations des caractéristiques de transfert du processeur non linéaire dues aux variations du signal de commande de luminosité.

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