System which uses threshold counts to achieve automatic focus

Details System which uses threshold counts to achieve automatic focus System which uses threshold counts to achieve automatic focus

1988-06-28

1989-06-27

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250201, G03B 300

Patent

active

048434132

ABSTRACT:
Apparatus for generating automatic focus signals for positioning a lens includes a circuit for calculating a difference value between a selected pixel intensity level and the average value of the pixel intensities which neighbor the selected pixel. The difference value is fed to a thresholding circuit which generates a signal for clocking a downstream counter whenever the difference value exceeds a selected threshold value. The lens is repositioned until the output from the counter is a maximum thereby indicating an infocus position of the lens.

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