Automatic focusing device utilizing a trend of variation and deg

Details Automatic focusing device utilizing a trend of variation and deg Automatic focusing device utilizing a trend of variation and deg

1992-04-02

1994-08-09

Razavi, Michael T.

Television

Camera, system and detail

Optics

348353, 348356, 348363, 354400, 354402, H04N 5232, H04N 530, H04N 5138

Patent

active

053370848

ABSTRACT:
An automatic focusing device including a lens group by which movement of a focused field of an object changes, a drive motor for moving the lens group, a luminance processing circuit for image-sensing the object through the lens group to extract a luminance signal, an accumulating circuit for outputting a focusing evaluation value signal for evaluating a focal condition of the object on the basis of the extracted luminance signal, a least squares circuit for determining reliability of the output focusing evaluation value signal, and a control circuit for controlling the drive motor to improve the focal condition of the object on the basis of the determined reliability.

REFERENCES:
patent: 4575237 (1986-03-01), Suzuki
patent: 4600832 (1986-07-01), Grund
patent: 4945220 (1990-07-01), Mallory et al.
patent: 5193124 (1993-03-01), Subbarao

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