Method of extracting automatic-focusing information

Details Method of extracting automatic-focusing information Method of extracting automatic-focusing information

1985-06-14

1986-10-07

Perkey, William B.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358227, G03B 300, H04N 538

Patent

active

046155988

ABSTRACT:
At least a portion of one line of an output signal from an image pickup device is stored in a delay line, and maximum and minimum values of the output signal are detected. Then, a coefficient is computed for shifting the minimum value to a least significant bit in an A/D converter and the maximum value to a most significant bit in the A/D converter. The stored signal is read out of the delay line, amplified by the coefficient, and converted to a digital signal representative of automatic-focusing information.

REFERENCES:
patent: 3967056 (1976-06-01), Yata et al.
patent: 4422097 (1983-12-01), Inuiya
patent: 4500925 (1985-02-01), Hamma et al.

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