Method and apparatus for automatically selecting the best focal

Details Method and apparatus for automatically selecting the best focal Method and apparatus for automatically selecting the best focal

1996-08-15

1997-05-27

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

348 79, G01J 120, G03B 310

Patent

active

056334915

ABSTRACT:
A method and apparatus for selecting the best focal position of an image in a field of view is based upon pixel values located in the image that correspond to locations defining an invariant optical property of the image. In the preferred embodiment, the invariant optical property of the image are pixels that form a "halo" that surround the boundary of an object and are contiguous and immediately adjacent thereto. It has been determined that a certain relationship should exist for this "halo" that surround the boundary of an object when the best focal position is selected.

REFERENCES:
patent: 4012634 (1977-03-01), Boulton et al.
patent: 4338024 (1982-07-01), Bolz et al.
patent: 4538299 (1985-08-01), DeForest
patent: 4945220 (1990-07-01), Mallory et al.
patent: 5003165 (1991-03-01), Sarfati et al.
patent: 5030981 (1991-07-01), Matsuzaki et al.
patent: 5225940 (1993-07-01), Ishii et al.

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