Electronic camera apparatus with automatically adjusted focus di

Details Electronic camera apparatus with automatically adjusted focus di Electronic camera apparatus with automatically adjusted focus di

1995-06-14

1996-10-15

Garber, Wendy

Television

Camera, system and detail

Optics

348349, H04N 5232

Patent

active

055659179

ABSTRACT:
Each time an area of a distance measurement frame is changed at a position near the center of the lens focused position of a lens unit between the infinite range and the shortest range, a value of a high frequency component which is independent on a contrast is calculated by a system control circuit by a high frequency component in the distance measurement frame which is obtained from a high-pass filter and a luminance component which is obtained from an integrator. The calculated value is compared with a reference value by the system control circuit. When the calculated value is equal to or smaller than the reference value as a result of the comparison, the distance measurement frame is enlarged at a predetermined ratio by the system control circuit. On the other hand, when the calculated value exceeds the reference value, a signal is supplied to a lens driving motor from the system control circuit in accordance with an ES value which is obtained through an ES filter from the inside of the distance measurement frame and the lens unit is moved by the lens driving motor, thereby executing a focus adjustment.

REFERENCES:
patent: 4804831 (1989-02-01), Baba et al.
patent: 4969045 (1990-11-01), Haruki et al.
patent: 5128768 (1992-07-01), Suda et al.
patent: 5235428 (1993-08-01), Hirota et al.

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