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Automatic focusing device

An automatic focus and focus position technology, applied in focusing devices, installations, TVs, etc., can solve problems such as inability to focus accurately, focus errors, and inability to obtain focusing effects, and achieve the accuracy that is conducive to focusing, assisting accuracy, and improving Effects of Focus Speed ​​and Accuracy

Active Publication Date: 2016-07-20
BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] It is impossible to focus well on subjects with thin lines and only weak textures, which may easily cause focus errors and take too long; in low-contrast and low-light conditions, the focus performance cannot be achieved well; Objects, polarized subjects, black subjects, or subjects with a mirror surface cannot be accurately focused
[0016] The focusing system and focusing method of the prior art cannot obtain a better focusing effect, thus affecting the imaging performance of the camera equipment

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0070] Such as image 3 The shown auto-focusing device a1 is suitable for imaging equipment (the structure is similar to imaging equipment 1), and includes: a lens 101, a lens driving component 102, a noise reduction module 103, and a focus control module 104.

[0071] The lens 101 is provided in the lens system 10 and generally refers to a plurality of lenses of the imaging device 1 on the same optical axis L. The lens 101 includes a lens for realizing automatic focus control, which is also called a focus lens. The focus lens can move back and forth along the optical axis of the lens, and is driven by the lens driving component 102 in response to a signal related to the focus result (ie, the focus signal), thereby moving the focus lens and changing the lens position. The lens position can be The lens position detection part inside or outside the autofocus device detects, which is beneficial to the subsequent re-driving of the focus lens. The original image can be generated based...

Embodiment 2

[0130] Such as Figure 8 The automatic focusing device a2 shown is different from the first embodiment, and further includes a focusing position search module 105.

[0131] The focus position search module 105 is adapted to continuously obtain the spatial domain result output by the focus control module 104 during the process of the lens driving component 102 driving the focus lens, search for the correspondence between the lens position and the spatial domain result, and based on the result The corresponding relationship identifies the expected frequency response result.

[0132] Corresponding to the focus statistics curve of the first embodiment, the corresponding relationship can be obtained intuitively based on the focus statistics curve. The process of the focus position search module 105 identifying the expected spatial domain result is the process of obtaining the global maximum value of the focus statistics curve. If the focus position corresponding to the global maximum is...

Embodiment 3

[0135] This embodiment is different from the first embodiment in that it provides a method for reducing noise of original image pixels in parallel, wherein the original image pixels are collected in the form of a focus detection window.

[0136] Such as Picture 9 The shown automatic focusing device a3 includes: a lens 101, a lens driving component 102, a noise reduction module 103', and a focus control module 104. Wherein, the noise reduction module 103' is adapted to obtain the frequency response result at the position of the image of interest in the original image, and output the noise reduction image based on the frequency response result of the passband part. The focus detection window is suitable for capturing the image position of interest in the original image.

[0137] The position of the image of interest is composed of the pixel of interest and the pixels around the pixel of interest, and the number of pixels is (1+2t) 2 Where t is a natural number greater than or equal...

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Abstract

The invention relates to an automatic focusing device. The automatic focusing device comprises a lens, a lens driving part, a noise reduction module and a focusing control module; on the basis of the lens, an original image can be generated through light guide of a shot object; the noise reduction module is suitable for obtaining a frequency response result of a pixel point of the original image and outputting a noise reduction image on the basis of the frequency response result of a passband part; the focusing control part is suitable for extracting a spatial domain edge operator in an interested image position of the noise reduction image, and correspondingly multiplying and summarizing the spatial domain edge operator and a pixel value in the interested image position according to the edge direction, such that a spatial domain result is obtained; and the lens driving part is suitable for driving the lens so as to obtain the expected spatial domain result, and driving the lens by taking the position of the lens when the expected spatial domain result is achieved as the focusing position. By means of the invention, the focusing accuracy and the focusing speed of the shot object can be increased under conditions of low contrast texture and weak light.

Description

Technical field [0001] The invention relates to the field of imaging, in particular to an automatic focusing device. Background technique [0002] Camera equipment, such as cameras and mobile phones with integrated camera functions, can usually implement autofocus. [0003] Autofocus (AutoFocus) uses the principle of light reflection from the subject. The light reflected by the subject is received by the image sensor (such as CCD / CMOS sensor) of the camera and other imaging equipment, and is processed by the computer to drive the electric focusing device to focus. [0004] A complete auto-focusing device may include: at least one imaging lens, at least one focusing lens, a photosensitive device, and a focal length adjustment mechanism. [0005] In terms of basic principles, autofocus methods can be divided into two categories: one is based on distance measurement autofocus based on the distance between the lens and the subject, and the other is based on clear focus detection on the fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232H04N5/357G02B7/28G03B13/36
Inventor 胡毅王浩王微
Owner BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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