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Rapid and automatic focusing method and system for camera zoom

An automatic focus and camera technology, which is applied to the components of TV systems, image communication, TV, etc., can solve the problems of small depth of field, inability to guarantee clear images, and partial focus, and achieve the effect of improving the focusing speed

Active Publication Date: 2014-07-16
SANLI VIDEO FREQUENCY SCI & TECH SHENZHEN
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AI Technical Summary

Problems solved by technology

However, the zoom tracking technology of the popular integrated cameras on the market is limited to a single tracking mode. In most scenes, the zoom process is basically clear at small magnifications, and serious defocusing occurs at high magnifications. In addition, high magnification depth of field Smaller, resulting in blurry images when zooming to high magnifications, and severely reducing the focusing speed at high magnifications
There is no guarantee that the image will remain clear during the zooming process, and it is difficult to quickly locate moving objects in the scene

Method used

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  • Rapid and automatic focusing method and system for camera zoom

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[0104] First, some labels that need to be used in the autofocus algorithm are explained. The variable ZoomValue is used to indicate the current zoom ratio. The variables FV1, FV2, and FV3 are used to store the focus evaluation value of the motor movement in sequence during the entire algorithm process. T0 is used as the division boundary between the near focus area and the far focus area of ​​the focus evaluation curve. AgcGain represents the current gain. T is used as the threshold for judging low illumination.

[0105] Automatic focus start: select the corresponding focus mode according to the value of ZoomValue and AgcGain. Since the depth of field is different under different magnifications, the focus curve curve is partially oscillating and monotonic in low-light environments. Therefore, select the corresponding focus mode according to the magnification and illuminance Can focus quickly, accurately and smoothly. In the automatic focus algorithm of the 18x lens in this em...

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Abstract

The invention provides a rapid and automatic focusing method and system for camera zoom. The rapid and automatic focusing method and system have the advantages that in the camera zoom process, the distance between a current scene center object and a lens is judged according to the last focusing position of a focusing motor, and therefore the closet tracking curve is selected for tracking; compared with the original mode that an image is significantly out of focus with high magnification due to the scheme that zoom is conducted at first and then focusing is conducted, the focusing speed can be greatly improved after zoom. The invention further provides a rapid and automatic focusing process. Different focusing modes are selected according to different illumination intensities and magnifications, and the focusing process comprises the step of rapid search of the near-focus area and the step of self-adaptive climbing. The focusing speed and accuracy and the image visual effect in the focusing process are greatly improved.

Description

technical field [0001] The invention relates to the field of camera control, in particular to a camera zoom-variable fast automatic focusing method and system. Background technique [0002] Nowadays, with the rapid development of society, economy, and science and technology, whether it is a developed country or a developing country, security issues have already become the focus of attention of the whole society. At the same time, with the climax of the five industrial revolutions, the automation and information construction of industrial enterprises has entered a stage of rapid development, and the highly modernized and intelligent production is becoming more and more perfect. requirements. In our country, more and more enterprises have begun to increase the budget for safety monitoring in the production process in their modernization and construction projects, and the enterprises that have implemented the TV monitoring system have benefited a lot from it. The field of sec...

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Application Information

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IPC IPC(8): H04N5/232
Inventor 孙少辉
Owner SANLI VIDEO FREQUENCY SCI & TECH SHENZHEN
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