A Synchronous Focusing Method During Zooming

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: 2016-10-26
ZHEJIANG DAHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A Synchronous Focusing Method During Zooming

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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 synchronous focusing method in the process of zooming to solve the problem in the prior art that after the object distance is changed due to scene changes, the image is relatively blurred during the zooming process and after the zooming is completed. The present invention determines the switching mode of switching the zoom tracking curve and the zoom tracking curve that drives the zoom motor and the focus motor to follow in the next round of rotation during the zoom process, switches the zoom tracking curve, and follows the transformation The final zoom tracking curve drives the zoom motor and the focus motor to rotate synchronously, enabling automatic focus during the zoom process, avoiding the situation that the image is in a blurred state after zooming to a high magnification, which makes it difficult to judge the focus direction of the automatic focus, and reduces the Difficulty autofocus, increased focus speed.

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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Patent Type & Authority Patents(China)
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 CO LTD
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