Video system having an adjustable digital gamma correction for contrast enhancement

A video system comprising a television camera for converting visual information into analog video signals, a digital video signal processor for digitally processing said anolog video signals and a television monitor for displaying an image of the processed analog video signals, said digital video signal processor including:

• a. an analog to digital converter for converting the analog video signals into video data,
• b. a first memory device for modifying the video data according to the particular contents contained therein,
• c. a second memory device, said second memory device having stored therein a plurality of table-look-ups, each table-look-up corresponding to a different gamma correction,
• d. a central processing unit for controlling the operations of the digital video signal processor, said operations including reading out one of said table-look-ups in said second memory device and writing said read data into said first memory device,
• e. a manually operated control device for controlling the operations of the central processing unit, said control device including means for selecting the particular table-look-ups to be read by said central processing unit, and
• f. a digital to analog converter for converting the modified video data from said first memory device into analog video signals.