Image processing apparatus with variable clamping

Details Image processing apparatus with variable clamping Image processing apparatus with variable clamping

1993-06-18

1995-09-05

Groody, James J.

Television

Image signal processing circuitry specific to television

Gray scale transformation

348695, 348255, H04N 552, H04N 518

Patent

active

054483069

ABSTRACT:
Image processing apparatus wherein the level of an input analog picture signal from an imaging device is controlled by gain control circuitry, and the gain-controlled analog signal is then converted into a digital signal. Feedback clamping is performed by generating an error signal by subtracting a target value from the digital signal, and then adding the error signal to the gain-controlled analog signal. Correct clamping is made possible by allowing the target value to be varied based upon the gain set by the gain control means.

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