Autofocus apparatus utilizing luma and chroma components to dete

Details Autofocus apparatus utilizing luma and chroma components to dete Autofocus apparatus utilizing luma and chroma components to dete

1994-01-31

1997-02-18

Peng, John K.

Television

Camera, system and detail

Optics

348346, 348354, 348345, G03B 1300, H04N 5232

Patent

active

056045387

ABSTRACT:
An image pickup apparatus includes a focus detector for extracting a focus signal according to a focus condition and for executing a focus adjustment, a detector for detecting chrominance level and luminance level in an image pickup plane from an image pickup signal output from an image sensor, a discriminator for discriminating an image pickup condition of the image pickup plane on the basis of an output of the detector and discriminating a predetermined low contrast condition where the detected chrominance and luminance levels are less than predetermined levels and a controller for controlling the focus detector on the basis of the focus signal and inhibiting a focus adjusting operation of the focus detector or reducing a speed thereof in accordance with a discriminating result of the discriminator.

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