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US 2006/0216012 A1Published application
Method for focusing by using a pre-flash
AssigneeCompal Electronics, Inc.
InventorsLee-Ren Kuo, Jian-Yu Lin, Feng-Chi Chang
Life of this patent
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AssigneeCompal Electronics, Inc.
InventorsLee-Ren Kuo, Jian-Yu Lin, Feng-Chi Chang
Estimating the term…
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 Y0 and the difference ΔY between Y1 and Y2. Finally, the image sensor adjusts the focus according to the distance D.
An method for focusing by using a pre-flash, the method comprising the steps of:
Dependencies are inferred from the claim text.