Method of detecting focus position of object from variable gray

Details Method of detecting focus position of object from variable gray Method of detecting focus position of object from variable gray

1994-07-29

1997-04-15

Mancuso, Joseph

Image analysis

Image enhancement or restoration

Focus measuring or adjusting

348348, G06K 940

Patent

active

056218222

ABSTRACT:
A focus position detecting method includes: obtaining quantized two-dimensional image data including an object to be in focus with respect to an optical system by imaging the object through the optical system, defining a specified area in the two-dimensional image data; defining a partial image in the specified area, the partial image being composed of a target pixel and peripheral pixels on a line in a specified direction in which the target pixel exists; defining a left area and a right area respectively positioned on left and right sides of the target pixel on the line in the specified direction; calculating gray-level data of each pixel in the left area; calculating gray-level data of each pixel in the right area; obtaining as a gray-level ratio a ratio of calculation result of the left area to calculation result of the right area; calculating an evaluation function by means of the gray-level ratio by repeating the gray-level ratio calculating step in the specified area; obtaining a plurality of evaluation function calculation values in a variety of optical positions by repeating the steps for calculating the gray-level data of the left and right areas, obtaining the gray-level ratio, and calculating the evaluation function through variation of the optical position of the object, and obtaining a focus position of the object with respect to the optical system based on the evaluation function calculation values.

REFERENCES:
patent: 3932733 (1976-01-01), Olsen et al.
patent: 4855943 (1989-08-01), Lewis
patent: 4969198 (1990-11-01), Batchelder et al.
patent: 4994920 (1991-02-01), Fujiwara et al.
patent: 5101277 (1992-03-01), Kanata
patent: 5267328 (1993-11-01), Gouge
patent: 5291535 (1994-03-01), Baker et al.
patent: 5299133 (1994-03-01), Kobsa et al.

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