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Method for synchronizing focusing operation and zooming operation

An automatic focus and magnification technology, applied in the field of synchronous focus, can solve problems such as image blur, achieve the effect of increasing the focusing speed and reducing the difficulty of automatic focusing

Active Publication Date: 2014-04-16
ZHEJIANG DAHUA TECH
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method of synchronous focusing during the zooming process to solve the problem in the prior art that after the subject distance changes due to scene changes, the image is relatively blurred during the zooming process and after the zooming is completed. question

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  • Method for synchronizing focusing operation and zooming operation
  • Method for synchronizing focusing operation and zooming operation

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Embodiment Construction

[0022] The invention provides a method for synchronous focusing in the process of zooming. By switching the zooming tracking curve during the zooming process, and following the converted zooming tracking curve, the zooming motor and the focusing motor are driven to rotate synchronously, so that the zooming During the process, automatic focusing is realized, the difficulty of automatic focusing is reduced, and the focusing speed is improved.

[0023] The implementation method of synchronous focusing in the zooming process provided by the present invention will be described in detail below in conjunction with the accompanying drawings, such as figure 1 Shown is a schematic flow chart of realizing synchronous focusing during the zooming process provided by Embodiment 1 of the present invention.

[0024] Step S101 : After receiving a zoom start command input by a user, calculate an initial zoom tracking curve.

[0025] Specifically, according to the initial position of the zoom m...

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Abstract

The invention discloses a method for synchronizing focusing operation and zooming operation. The method for synchronizing the focusing operation and the zooming operation is used for solving the problem that in the prior art, after the shooting object distance is changed due to scene changes, images are fuzzy to a great extent in the zooming process and after the zooming process is accomplished. The method for synchronizing the focusing operation and the zooming operation comprises the steps that in the zooming process, a switching mode for switching zooming tracking curves and a zooming tracking curve are determined, wherein the next cycle of rotation of a zooming motor and a focusing motor is driven according to the zooming tracking curve; the zooming tracking curves are switched, and the zooming motor and the focusing motor are driven to synchronously rotate according to the changed zooming tracking curve. Automatic focusing can be achieved in the zooming process, the situation that after multiplying power of an image is zoomed to form high multiplying power, the image is in a fuzzy state so that the focusing direction of automatic focusing operation cannot be easily judged is avoided, the difficulty of automatic focusing operation is reduced, and the focusing speed is increased.

Description

technical field [0001] The invention relates to the field of video monitoring, in particular to a method for synchronous focusing during zooming. Background technique [0002] The integrated camera has the functions of zooming and auto-focusing. It has a compact structure, is easy to use, and has a wide monitoring range. It has been widely used in the field of video surveillance. How to achieve fast zoom speed, fast and accurate focusing, and avoid image blurring are very important for integrated cameras. [0003] Since the zoom lens and focus lens in the integrated camera lens move separately, driven by the zoom motor and the focus motor respectively, during the zoom process, zoom tracking is required so that the focus lens changes synchronously according to the position of the zoom lens , so that the image can be clearly focused. [0004] The full zoom speed is the key performance of the integrated camera, which generally needs to be completed within 3 to 4 seconds. Ther...

Claims

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Application Information

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IPC IPC(8): G03B13/36G02B7/36H04N5/232
Inventor 戴嘉通张兴明傅利泉朱江明吴军吴坚
Owner ZHEJIANG DAHUA TECH
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