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Verfahren und Vorrichtung zur Aufbereitung von Videosignalen

Process and device for the processing of video signals
 
: Schmidberger, E.; Baier, A.; Nowak, R.

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Frontpage ()

DE 1987-3714861 A: 19870505
DE 1987-3714861 A: 19870505
DE 3714861 C2: 19890216
H04N0005
Deutsch
Patent, Elektronische Publikation
Fraunhofer IPA ()

Abstract
A process and a device for the processing of video signals for the increase of image contrast. According to this process and the device, the minimum and the maximum values a picture information are determined from a video signal of a predetermined time length in a suitably designed circuit part. Following this, an average value is formed between the determined minimum and maximum values in a circuit part, said average value applying a direct current level to the video signal of a predetermined time length. At approximately the same time as this, a differential value is determined between the determined minimum and maximum values in another circuit part, said differential value acting as a gain measuring parameter ultimately affecting the final gain of the video signal in an amplification circuit.

: http://publica.fraunhofer.de/dokumente/PX-38601.html