Tracking focusing method and device, equipment and medium

A technology of image acquisition equipment and focal length, which is applied in the field of tracking and focusing, and can solve problems such as untimely focusing

Active Publication Date: 2019-12-13
ZHEJIANG DAHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a method, device, equipment and medi...

Method used

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  • Tracking focusing method and device, equipment and medium
  • Tracking focusing method and device, equipment and medium
  • Tracking focusing method and device, equipment and medium

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Embodiment 1

[0047] figure 1 It is a schematic diagram of a focus tracking process provided by an embodiment of the present invention, and the process includes the following steps:

[0048] S101: Receive the object distance between the image acquisition device and the measured object measured for the current frame returned by the radar, and determine the object distance difference between the current frame and the preset number of image frames before the current frame for every two adjacent frames.

[0049] The tracking and focusing method provided by the embodiment of the present invention is applied to an image acquisition device. The image acquisition device is equipped with a radar. Specifically, the image acquisition device can be an all-in-one machine with a long-focus movement equipped with a radar or an on-board camera with a radar. The dome camera equipment with a long focal length movement is not specifically limited in this embodiment of the present invention.

[0050]When the ...

Embodiment 2

[0067] In order to realize object distance prediction, on the basis of the above-mentioned embodiments, in the embodiment of the present invention, according to the object distance difference between every two adjacent frames, each parameter value corresponding to each currently saved object distance difference and The linear prediction model corresponding to each parameter value, predicting the object distance of the next frame includes:

[0068] Determine the object distance between the next frame and the current frame according to the object distance difference between each adjacent two frames, each parameter value corresponding to each object distance difference currently stored, and the linear prediction model corresponding to each parameter value Difference;

[0069] The object distance of the next frame is determined according to the object distance of the current frame and the object distance difference between the next frame and the current frame.

[0070] Wherein, t...

Embodiment 3

[0083] According to the description of the above embodiment, it can be seen that in the embodiment of the present invention, the linear prediction model is used to predict the object distance, and the parameter value of each parameter in the currently saved linear prediction model may be a preset initial value, or may be an updated value. In order to predict the object distance more accurately, in the embodiment of the present invention, the parameter values ​​of each parameter in the linear prediction model may be updated periodically. On the basis of the above embodiments, in the embodiment of the present invention, after the object distance of the next frame is predicted, the method further includes:

[0084] Update the number of predictions saved in the current iteration cycle;

[0085] Judging whether the updated number of predictions is greater than a preset number threshold;

[0086]If so, update the currently saved parameter values ​​according to the object distance c...

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Abstract

The invention discloses a tracking focusing method and device, equipment and a medium, which are used for solving the problem of untimely focusing in the tracking process. The method comprises the following steps: receiving an object distance between image acquisition equipment and a measured object, which is returned by a radar and is measured for a current frame, and determining an object distance difference between every two adjacent image frames in the current frame and a preset number of image frames before the current frame; predicting the object distance of the next frame according to the object distance difference of every two adjacent frames, each currently stored parameter value corresponding to each object distance difference and a linear prediction model corresponding to each parameter value; and adjusting the focal length of the image acquisition equipment according to the predicted object distance of the next frame. According to the object distance difference between every two adjacent image frames in the current frame and the preset number of image frames before the current frame, the object distance of the next frame is predicted by using the linear prediction model, so that the algorithm is simple, the calculation amount is not too large, the focal length can be adjusted in advance according to the predicted object distance, the focusing speed meets the real-time requirement, and the focusing effect is ensured.

Description

technical field [0001] The present invention relates to the field of image processing, in particular to a method, device, equipment and medium for tracking focus. Background technique [0002] With the implementation of smart solutions in the security field, in the process of video tracking objects, the requirements for the definition of object imaging are getting higher and higher. [0003] In the prior art, when focusing on tracking an object, the method of strengthening the FV weight of the target area and the method of establishing a background model are generally adopted. The method to strengthen the FV weight of the target area is to set the target area during tracking, and make the FV value of the target area account for more than the FV value of the non-target area. When the moving distance of the target exceeds a certain When the threshold or the target area becomes blurred, a focus is triggered, the focus lens is driven to move, and then the search termination jud...

Claims

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Application Information

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IPC IPC(8): H04N5/232
CPCH04N23/671H04N23/67
Inventor 刘春龙卢二利陈明珠况璐李准夏瑞
Owner ZHEJIANG DAHUA TECH CO LTD
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