Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1989-01-19
1991-09-03
Adams, Russell E.
Facsimile and static presentation processing
Facsimile
Recording apparatus
354402, H04N 5232
Patent
active
RE0336823
ABSTRACT:
An auto focus circuit for a video camera comprises an A-D converting circuit (7) for converting to a digital amount a high frequency component absolute value output of a luminance signal in a sampling area for focusing. The A-D converting circuit (7) is connected so that the high frequency component absolute value output of a luminance signal is directly converted to a digital amount. Then, the signal converted to a digital amount is added in an integrating circuit (12) for each field and the signal amount in one field and the signal amount in the coming one field ahead of it or behind it are compared in a comparing circuit (10) so that the output of comparison serves for control of focusing. Thus, addition processing of the high frequency component of the luminance signal, that is, averaging processing is performed digitally in the integrating circuit (12). Accordingly, as compared with the case of analog averaging processing of a signal, the processing operation is stable and as a result the focusing precision is improved.
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Adams Russell E.
Sanyo Electric Co,. Ltd.
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