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Active and passive combined zoom automatic focusing method and system

An automatic focusing, active and passive technology, applied in the parts of the TV system, the parts of the color TV, the installation and other directions, can solve the problems of taking a lot of time and unable to meet the real-time requirements, so as to improve the accuracy and improve the roughness. The effect of focusing efficiency and reducing time consumption

Inactive Publication Date: 2018-07-31
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method improves the focusing speed to a certain extent, but it still takes a lot of time to calculate the defocus distance of the target image, which cannot meet the occasions with high real-time requirements.

Method used

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  • Active and passive combined zoom automatic focusing method and system
  • Active and passive combined zoom automatic focusing method and system
  • Active and passive combined zoom automatic focusing method and system

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Embodiment 1

[0041] This embodiment discloses an active-passive combination variable magnification automatic focusing method. The working flow chart is as follows: figure 1 shown, including the following steps:

[0042] Step 1: Measure the distance between the target 4 and the imaging system through the active ranging system 1, and change the positions of the zoom group 2.2 and the compensation group 2.3 of the optical imaging system according to the distance value to realize the active coarse focus adjustment of the optical imaging system.

[0043] The active ranging system 1 measures the distance information u between the target 4 and the imaging system, and transmits the distance information of the target 4 to the ranging interface 3.1 of the control system 3 .

[0044] The control system 3 controls the optical imaging system to zoom according to the distance information u of the target 4 and the input zoom ratio M. Use the quantity with "*" to represent each physical quantity after zo...

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Abstract

The invention discloses an active and passive combined zoom automatic focusing method and system, and belongs to the technical field of photoelectric imaging. The active and passive combined zoom automatic focusing method comprises the following steps that step one: the distance from the target to the imaging system is measured through an active distance measuring system, and the position of the zoom group and the compensation group of the optical imaging system is changed according to the distance value so as to realize active rough focusing of the optical imaging system; and step two: the passive imaging system is used for realizing image acquisition and processing and performing passive fine focusing according to the image definition evaluation function value until focusing is completed. The invention also discloses an active and passive combined zoom automatic focusing system for realizing the method. The system comprises the active distance measuring system, the passive imaging system and a control system. Zoom automatic focusing used for the optical system can be realized, the high-definition image can be rapidly acquired through active and passive combined zoom automatic focusing and the real-time, accuracy and high precision requirements can be met.

Description

technical field [0001] The invention relates to a variable magnification automatic focusing method and system combining active and passive methods, and belongs to the technical field of photoelectric imaging. Background technique [0002] With the development of science and technology, high-definition images, as a high-capacity information carrier, have played an increasingly important role in various fields. As a common tool for obtaining images, optical imaging systems have been widely used in industrial production, daily civilian use, scientific research, military detection and other fields, and play an important role in augmented reality, photography, microscopic imaging, space optical remote sensing, etc. . The focal length of the fixed-focus optical system is fixed, and there is only one field of view. When it is necessary to adjust the size of the object to be photographed (that is, zoom), it can only be realized by moving the photographer or changing the lens. The r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B7/28G02B7/38H04N5/232
CPCG02B7/28G02B7/287G02B7/38H04N23/67
Inventor 郝群曹杰肖宇晴张芳华程阳
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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