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Automatic focusing method and image collecting device

An image acquisition device and auto-focusing technology, which is applied to the focusing device, installation, optics, etc., can solve the problems of cumbersome and long-time focusing process, and achieve the effect of avoiding large amount of calculation and shortening the adjustment time

Inactive Publication Date: 2008-08-06
VIMICRO CORP
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Problems solved by technology

[0004] Generally speaking, the adjustment range of the focal length of the lens is relatively wide, and the focal length adjustment mechanism is a mechanical device, which requires a long time for image acquisition and analysis for all positions, especially for fast-changing objects, the focusing process is too cumbersome

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  • Automatic focusing method and image collecting device
  • Automatic focusing method and image collecting device
  • Automatic focusing method and image collecting device

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Embodiment Construction

[0014] Hereinafter, the present invention will be described in detail.

[0015] The widely used image acquisition device includes a lens for imaging; a photosensitive device, wherein the photosensitive device has a predetermined area U×V and resolution W×N, and a focal length adjustment device.

[0016] Most of the imaging principles of image acquisition equipment conform to the principle of convex lens imaging. Referring to FIG. 1 , according to the principle of convex lens imaging, an object 12 with a height H will form an inverted image 14 after being focused by a convex lens 12 with a focal length f, and the height of the inverted image 14 is h. Wherein, the distance A from the object 12 to the convex lens 10 is called the object distance, and the distance a from the image 14 to the lens 10 is called the image distance.

[0017] Then, according to the principle of convex lens imaging, the focal length f, object distance A and image distance a should satisfy the following ...

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Abstract

The invention discloses an automatic focus method and an image capture device with a function of automatic focus. The automatic focus method provided by the invention comprises the following steps of: capturing an image containing a preconcerted object, automatically analyzing the image to obtain the real size of an image of the object, and further providing the real size of the object, and the distance between an image surface of a sensitized component, calculating the estimation value of a correct focusing focus under the corresponding object distance, and adjusting a focus adjustment device so as to enable the focus of the image capture device reach to the estimation value of the correct focusing focus. The invention is capable of greatly reducing the adjustment time through estimating the position of the correct focusing focus and directly adjust the focus to the estimated position so as to overcome the disadvantage of low processing speed in the prior art.

Description

technical field [0001] The invention relates to an automatic focusing method, in particular to an automatic focusing method based on face detection and an image acquisition device. Background technique [0002] For image acquisition equipment, the distance between the object to be photographed and the acquisition equipment is often in a state of change. In order to capture a clear image, the focal length must be adjusted according to the distance between the subject and the acquisition equipment. This process of automatically adjusting the focus to obtain a clear image is called autofocus. [0003] The general focusing algorithm adopts all the adjustable ranges of the focal length, collects images and analyzes them, obtains the evaluation value of the sharpness of each position, and calculates the position corresponding to the maximum evaluation value, and adjusts the focal length to this position to obtain clarity Image. [0004] Generally speaking, the adjustment range o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B13/36G02B7/28
Inventor 邓亚峰黄英俞青邓中翰
Owner VIMICRO CORP
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