Apparatus and method to control focusing of photographing...

Details Apparatus and method to control focusing of photographing... Apparatus and method to control focusing of photographing...

2011-04-05

2011-04-05

Ho, Tuan (Department: 2622)

Television

Camera, system and detail

Optics

Reexamination Certificate

active

07920202

ABSTRACT:
An apparatus and method to control the focusing of a photographing device, in which a light source portion is removed from an image, is provided. The focusing of the photographing device is controlled according to whether the image is in a high- or low-illuminance state. The apparatus includes a luminance detection unit detecting respective luminance values of pixels included in an image; a filter unit outputting values corresponding to the detected luminance values; a threshold calculation unit counting a number of pixels having luminance values greater than a predetermined value among the luminance values of the pixels included in the image and calculating a threshold value using a ratio of the counted number of pixels to a total number of pixels included in the image; and a control unit controlling a position of a lens using output values greater than the calculated threshold value among the output values.

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patent: 2001/0000674 (2001-05-01), Yasuda
patent: 2008/0298789 (2008-12-01), Ohki
patent: 2010/0134643 (2010-06-01), Koishi
patent: 07-030798 (1995-01-01), None
patent: 07-162731 (1995-06-01), None
patent: 2000-258681 (2000-09-01), None

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