Automatic focusing of every image point in an image

Details Automatic focusing of every image point in an image Automatic focusing of every image point in an image

1980-03-19

1982-09-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250201, G01J 136

Patent

active

043508847

ABSTRACT:
Every image point of an image of a sample formed by an optical objective, focussed by, for each image point, deriving a representation of the autocorrelation function of the brightness distribution of the image of that image point, deriving a representation of the average of the autocorrelation function of the brightness distribution of a plurality of image points in the region of that image point, deriving a representation constituting a function of the quotient formed by dividing the representation of the autocorrelation function for that image point by the representation of the average of the autocorrelation function, and varying the distance between the objective and the sample while iteratively performing the above steps of deriving for determining the distance at which the function of the quotient has a maximum value.

REFERENCES:
patent: 4247762 (1981-01-01), Wilwerding

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