Automatic focusing method for electric adjustable liquid lens

A liquid lens and autofocus technology, applied in the lens, focusing device, optics, etc., can solve the problems of long time, low volume power consumption of the autofocus system, and high focus power consumption, and achieves less time-consuming focusing, fast and stable focusing, compact effect

Inactive Publication Date: 2016-04-27
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of large volume, high power consumption and long time for focusing in the existing autofocus system, and to provide an autofocus method for an electric adjustable focus liquid lens by using the above-mentioned novel focusable liquid lens, so that the automatic focus Smaller system size, lower power consumption, faster and more stable focus

Method used

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  • Automatic focusing method for electric adjustable liquid lens
  • Automatic focusing method for electric adjustable liquid lens
  • Automatic focusing method for electric adjustable liquid lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] join Figure 1~Figure 7 , the automatic focus method of the electric adjustable focus liquid lens is suitable for the camera device that needs automatic focus, and it is characterized in that the operation steps are as follows:

[0038] (A) Image sensor to acquire images: any image sensor that is compatible with an electric adjustable focus liquid lens can be used to acquire images;

[0039] (B) Image preprocessing: Neighborhood averaging method is used to remove noise, grayscale transformation eliminates the influence of light, and image quality is improved to make autofocus more accurate;

[0040] (C) Select the focus area: the user selects the area to be focused on the image display;

[0041] (D) Focus area tracking: The tracking algorithm realizes the tracking of the focus area according to the characteristics of the focus area selected by the user;

[0042] (E) Calculating the sharpness value of the focus area: calculate the sum of the absolute value of gradients...

Embodiment 2

[0045] Embodiment 2: This embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0046] The automatic focus method of the electric adjustable focus liquid lens is characterized in that in the step (D), the focus area selected by the user is tracked, and in the step (E), only the sharpness value of the focus area is calculated , which reduces the interference of the movement of other objects in the imaging screen on the automatic focus of the focus area, and reduces the amount of calculation.

[0047] The automatic focus method of the electric adjustable focus liquid lens is characterized in that the focus control algorithm in the step (F), the focal length search algorithm for the clearest image of the imaging system used includes the following steps:

[0048] ① Determine the direction of liquid lens driver current change;

[0049] ② According to the determined current change direction, change the driving current of the electric adjustabl...

Embodiment 3

[0054] refer to image 3 , this item is based on the autofocus method of the electric adjustable focus liquid lens, which is applied to the visual autofocus detection system 100 of defective parts, so as to adjust the focal length of the imaging system so that the defective parts 19 on the parts conveyor belt 18 can be clearly displayed in the imaging system image. The defective part visual autofocus detection system 100 includes an electric adjustable focus liquid lens 11, a fixed focus lens 12, a USB2.0 industrial camera 13, a USB image transmission line 14, a liquid lens driver connection line 15, an electric adjustable focus liquid lens driver 16, PC17.

[0055] Among them, the electric adjustable focus lens 11 is a C-mount lens. Here, the C-mount electric adjustable focus liquid lens produced by Optotune Company is selected as the model EL-10-30-Ci. It is 0-293mA, and the larger the current, the smaller the focal length of the liquid lens. Due to the problem of the inter...

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Abstract

The invention relates to an automatic focusing method for an electric adjustable liquid lens. According to the method, a target image is obtained through an image sensor; pretreatment is carried out on the image to eliminate the effects on the focusing process caused by light and noise; after a user selects a focusing region, a tracking unit tracks the focusing region and calculates a definition value of the region to feed back to a focusing control unit; and the focusing control unit carries out judgment according to the change condition of the definition value and drives the liquid lens to change the focus distance to finish focusing through an electric adjustable liquid lens driver. An optical component does not need to relatively displace when focusing, so that the focusing speed is high; and the effects of compact structure and long service lifetime of an automatic focusing system can be achieved.

Description

technical field [0001] The invention relates to an automatic focus method of an electrically adjustable focus liquid lens. technical background [0002] With the rapid development of automation and intelligence of various imaging equipment, the application of autofocus technology is becoming more and more extensive. Obtain clear images on image detectors (such as visible light CCD, CMOS or infrared detectors). As a result, the imaging system is bulky, and the motor drives the lens to move to find the best position. The power consumption is high, and the focusing time is long. Electric adjustable focus liquid lens is a new type of variable focus lens in recent years. Unlike traditional zoom lenses, which achieve zoom by adjusting the distance between two lenses with fixed focal lengths, liquid lenses adjust the focal length by changing the pressure of the liquid through an electric field. . According to relevant tests, the energy consumed by each zooming process is only 0....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B13/36G02B3/14
CPCG03B13/36G02B3/14
Inventor 李恒宇刘航程洪涛夏瑞隆袁泽峰
Owner SHANGHAI UNIV
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