Method for focusing by using a pre-flash

Details Method for focusing by using a pre-flash Method for focusing by using a pre-flash

2005-10-28

2009-02-17

Fuller, Rodney E (Department: 2862)

Photography

With exposure objective focusing means, focusing aid, or...

Having auxiliary illumination

C396S080000

Reexamination Certificate

active

07493035

ABSTRACT:
A method for focusing by using a pre-flash is provided. The method includes the following steps. First, the image sensor captures a first image of the object, wherein the average brightness of the first image is calculated to be Y0. Next, the image sensor captures a second image of the object with the aid of a first pre-flash having a first energy, wherein the average brightness of the second image is calculated to be Y1. Afterwards, the image sensor captures a third image of the object with the aid of a second pre-flash having a second energy, wherein the average brightness of the third image is calculated to be Y2. Then, the distance D to the object is calculated according to the brightness Y0and the difference ΔY between Y1and Y2. Finally, the image sensor adjusts the focus according to the distance D.

REFERENCES:
patent: 5128529 (1992-07-01), Nagaoka et al.
patent: 6700614 (2004-03-01), Hata
patent: 7071986 (2006-07-01), Kobayashi et al.
patent: 7126640 (2006-10-01), Takei
patent: 7295243 (2007-11-01), Hata
patent: 2003/0043290 (2003-03-01), Sasaki
patent: 486603 (2002-05-01), None

Affiliated with

Also associated with

Rating

Method for focusing by using a pre-flash does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for focusing by using a pre-flash, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for focusing by using a pre-flash will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4064857