Automatic focusing method and image collecting device

An image acquisition device and automatic focusing technology, applied in focusing devices, image communication, installation, etc., can solve the problems of cumbersome focusing process, inconvenient automatic focusing technology, long time, etc., achieve clear imaging, shorten adjustment time, and avoid calculation. big effect

Active Publication Date: 2008-10-22
BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECH CO LTD
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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

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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

[0048] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0049]The widely used image acquisition device includes at least one imaging lens for imaging; at least one focusing lens for focusing; a photosensitive device, wherein the photosensitive device has a predetermined area U*V and resolution W*N; and A focus adjustment mechanism.

[0050] The imaging principle of the image acquisition device mostly conforms to the principle of convex lens imaging. refer to figure 1 As shown, according to the principle of convex lens imaging, an object with height H will form an inverted image after being focused by a convex lens with focal length f, and the height o...

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Abstract

The invention discloses an automatic focusing method and an image acquisition device, wherein the device comprises at least one imaging lens, at least one focusing lens, a photosensitive device and a focal length regulation mechanism. The method comprises the following steps that: A. according to the actual scale of an object, the actual scale of an image formed on the photosensitive device by the object and the distance between the photosensitive device and the imaging lens, the product of the distance between the photosensitive device and the imaging lens and the actual object scale divided by the sum of the actual object scale and the actual image scale equals a focusing focal length estimation value FF; B. the focal length regulation mechanism is regulated to allow the focal length to reach the focusing focal length estimation value FF; C. the focal length is fine-adjusted to a plurality of focal length positions around the focusing focal length estimation value FF; the focusing estimation value of the image formed on each focal length position is calculated, and the focal length corresponding to the maximum focusing estimation value is taken as an accurate focusing focal length MF; D. the focal length regulation mechanism is regulated to allow the focal length to reach the accurate focusing focal length MF, and then the automatic focusing process is accomplished.

Description

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

Claims

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Application Information

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IPC IPC(8): G02B7/28H04N5/225G03B13/36
Inventor 邓亚峰黄英俞青邓中翰
Owner BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECH CO LTD
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