Contrast sensing apparatus for automatic focus systems

Details Contrast sensing apparatus for automatic focus systems Contrast sensing apparatus for automatic focus systems

1978-11-30

1981-01-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354 25, G01J 136

Patent

active

042477620

ABSTRACT:
An improved automatic focus system wherein circuitry is provided to inhibit the focusing function when the scene being viewed provides too little contrast for satisfactory operation.

REFERENCES:
patent: 3274914 (1966-09-01), Biederman et al.
patent: 3836772 (1974-09-01), Stauffer
patent: 3838275 (1974-09-01), Stauffer
patent: 3958117 (1976-05-01), Stauffer
patent: 4002899 (1977-01-01), Stauffer
patent: 4078172 (1978-03-01), Wilwerding
patent: 4085320 (1978-04-01), Wilwerding
patent: 4103152 (1978-07-01), Stauffer
patent: 4107520 (1978-08-01), Wilwerding

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