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Automatic focusing system and automatic focusing method

An auto-focus and contrast technology, applied to TV system components, focusing devices, installation, etc., can solve problems such as blurred images, inability to focus accurately, unstable image brightness, etc., and achieve the effect of clear images

Inactive Publication Date: 2011-01-19
FOSHAN PREMIER SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of auto-focusing, it is generally sufficient to select the point with the maximum contrast value in the central area of ​​the image to be captured for focusing. However, when shooting under fluorescent light, the brightness of the captured image will be unstable due to the flickering phenomenon, so the selected The point of maximum contrast value is unstable
When the camera is shooting, it is difficult to determine the maximum contrast value point, it cannot focus accurately, and the captured image is blurred

Method used

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  • Automatic focusing system and automatic focusing method
  • Automatic focusing system and automatic focusing method
  • Automatic focusing system and automatic focusing method

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Embodiment Construction

[0013] The embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0014] see figure 1 , which is the autofocus system 10 provided by the embodiment of the present invention. The auto-focus system 10 is used to control an actuator 18 to drive a lens 19 to focus. The autofocus system 10 includes an ambient brightness detection unit 12 , a recording unit 14 and a correction unit 16 . The ambient brightness detection unit 12 and the recording unit 14 are respectively electrically connected to the correction unit 16 . The correction unit 16 is electrically connected to the actuator 18 , and the actuator 18 is electrically connected to the lens 19 .

[0015] The ambient brightness detection unit 12 includes an ambient brightness recording unit 122 and a comparing unit 124 , and the ambient brightness recording unit 122 is electrically connected to the comparing unit 124 . The ambient brightness recording un...

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Abstract

An auto-focusing system comprises an environment brightness detecting unit, a recording unit and a correcting unit. The environment brightness detecting unit is used for detecting the environment brightness to get a detection value; the recording unit is used for storing a group of brightness values of shot images and contrast values corresponding to the brightness values. A standard brightness value and a standard contrast value are preset in the correcting unit which carries out a computation according to the detection value, the brightness values of images, the preset standard brightness value and standard contrast value so as to correct the contrast values corresponding to the brightness values of the images. The auto-focusing system can correct the contrast value of the shot images under the daylight lamp shooting environment so as to lead a camera to accurately focus and lead the image to be clear. The invention also provides an auto-focusing method.

Description

technical field [0001] The invention relates to an automatic focusing system and an automatic focusing method, in particular to an automatic focusing system and an automatic focusing method applicable to a digital camera. Background technique [0002] When a digital camera shoots under a fluorescent lamp, because the accumulative charge speed and frequency of the photoelectric coupling element are different from the frequency of the current, the digital camera captures darkness when the lamp does not emit light. This intermittent dark image is reflected on the LCD screen of the digital camera as flicker, which is caused by the asynchronous charge speed of the photoelectric coupling element of the camera and the frequency of the fluorescent lamp. [0003] In the process of auto-focusing, it is generally sufficient to select the point with the maximum contrast value in the central area of ​​the image to be captured for focusing. However, when shooting under fluorescent light, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B13/36G02B7/28
CPCH04N5/2351G03B13/36H04N5/23212G02B7/36H04N23/673H04N23/71
Inventor 文志辉
Owner FOSHAN PREMIER SCI & TECH CO LTD