Automatic focusing of an optical system

Details Automatic focusing of an optical system Automatic focusing of an optical system

1973-03-19

1976-01-13

Ruggiero, Joseph F.

Registers

Transfer mechanism

Traveling pawl

178DIG29, 178 72, H04N 538, G06F 1546

Patent

active

039327337

ABSTRACT:
A method of automatically focusing an optical system onto an image includes deriving a measure of the contrast for each of a plurality of images obtained at different settings of the optical and selecting as the final setting that setting which corresponds to the greatest contrast, the measure of contrast being derived from the distribution of selected image elements in a grey scale. Apparatus for carrying out the method uses an image converter to produce the image of the optical system for examination by a grey level measuring device which measures the grey values of a number of image elements.
The distribution of the measured grey values within a grey scale is registered in a memory and this information is used by an electrical calculating system which calculates the value of a contrast function for the particular image being examined. A control device is connected to the calculating system and searches for the maximum value of the contrast function amongst the function values obtained at various settings of the optical system to provide the final setting.

REFERENCES:
patent: 3450833 (1969-06-01), Hobrough
patent: 3699251 (1972-10-01), McKechnie
patent: 3721759 (1973-03-01), Lang
patent: 3728482 (1973-04-01), Wren
Kujoory -- "Video Display And Focus-Assist Device Of Cydac, A Flying-Spot Scanning Microscope" -- Thesis submitted to faculty of Moore School of Electrical Engineering, University Of Pennsylvania, Dec. 1971.

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