Auto-focusing method using variable noise level and digital...

Details Auto-focusing method using variable noise level and digital... Auto-focusing method using variable noise level and digital...

2006-04-11

2009-12-29

Chan, Jason (Department: 2622)

Television

Camera, system and detail

Optics

C348S216100, C348S241000, C348S243000, C348S248000, C348S349000

Reexamination Certificate

active

07639302

ABSTRACT:
An auto-focusing method and a digital image processing apparatus using the same are disclosed. The auto-focusing method includes: setting a reference noise level if an illuminance of a photographing area is larger than a predetermined reference value, and setting a variable noise level that varies according to the illuminance of photographing area if the illuminance of photographing area is smaller than or equal to the predetermined reference value; calculating a focus value of each position of the focus lens while driving the focus lens within the predetermined lens-driving range in the unit of a step and selecting a maximum focus value of the predetermined lens-driving range among the calculated focus values, wherein in the calculating of the focus value, the noise level is subtracted from a pixel data that is larger than the noise level and the result of subtracting is used as the pixel data to calculate the focus value.

REFERENCES:
patent: 6580062 (2003-06-01), Baer
patent: 7095443 (2006-08-01), Yoshikawa
patent: 2004/0130650 (2004-07-01), Lee et al.
patent: 2005/0128358 (2005-06-01), Nakajima et al.
patent: 2005/0276592 (2005-12-01), Stavely et al.
patent: 2001-128056 (2001-05-01), None
patent: 2002-287013 (2002-10-01), None
patent: 2005-091456 (2005-04-01), None

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