Auto-focus system for video camera

Details Auto-focus system for video camera Auto-focus system for video camera

1992-12-03

1993-08-10

Razavi, Michael T.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358225, H04N 5232, H04N 5225

Patent

active

052354288

ABSTRACT:
A focus detection signal is generated from the video signal produced by a video camera by deriving higher frequency components of that video signal, detecting when those higher frequency components exceed a minimum threshold level, sensing when the video signal exceeds a maximum threshold, and integrating those higher frequency components which exceed the minimum threshold, except during an interval when the video signal exceeds the maximum threshold, thereby producing the focus detection signal.

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