AUTOFOCUS SEARCHING METHOD
First Claim
1. An autofocus searching method, comprising:
- calculating a focus value of an image according to each position of an object lens in the movement, wherein the focus value comprises at least an intensity value of the image;
performing focus searching based on a first focus-searching step constant and a first focus-searching direction, wherein the first focus-searching step constant is a value of a function of the focus value and a focus-searching step, and the focus value is inversely proportional to the focus-searching step; and
performing focus searching based on a second focus-searching direction and a second focus-searching step constant if a focus-searching position moves across a peak of the focus value, wherein the second focus-searching direction is opposite to the first focus-searching direction.
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Accused Products
Abstract
An autofocus searching method includes the following procedures. First, focus values of images, which are acquired during the movement of the object lens, are calculated, in which the focus value includes at least the intensity value of the image derived from the intensities of the pixels of the image. Next, focus searching is based on a first focus-searching step constant and a first focus-searching direction, in which the first focus-searching step constant is a function, e.g., the multiplication, of the focus value and a focus-searching step. If the focus searching position moves across a peak of the focus values, it is then amended to be based on a second focus-searching direction and a second focus-searching step constant, in which the second focus-searching step constant is smaller than the first focus-searching step constant, and the second focus-searching direction is opposite to the first focus-searching direction.
228 Citations
18 Claims
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1. An autofocus searching method, comprising:
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calculating a focus value of an image according to each position of an object lens in the movement, wherein the focus value comprises at least an intensity value of the image; performing focus searching based on a first focus-searching step constant and a first focus-searching direction, wherein the first focus-searching step constant is a value of a function of the focus value and a focus-searching step, and the focus value is inversely proportional to the focus-searching step; and performing focus searching based on a second focus-searching direction and a second focus-searching step constant if a focus-searching position moves across a peak of the focus value, wherein the second focus-searching direction is opposite to the first focus-searching direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification