Covariance focus sensor

Details Covariance focus sensor Covariance focus sensor

1996-07-23

1998-01-06

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

396107, G02B 2764

Patent

active

057058032

ABSTRACT:
A focus sensor for detecting the focus state of an image forming optical system relative to an object, the optical system having a plane of best imaging focus, includes: a plurality of image detectors located at a corresponding plurality of positions relative to the plane of best imaging focus for producing a respective plurality of image signals; and a signal processor connected to the image detectors for determining a position of best focus by calculating the covariances between respective pairs of the image signals.

REFERENCES:
patent: Re32886 (1989-03-01), Stauffer
patent: 4341953 (1982-07-01), Sakai et al.
Peter Carellas, "Taking the Blur Out of Autofocus Camera Mechanisms", Optics and Photonics, Sep. 1993, pp. 6, 7, and 28.

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