A camera auto-focus control method for moving targets

A moving target and auto-focus technology, applied in image analysis, image communication, image data processing, etc., can solve problems such as lack of target feature information, inability to adapt to security monitoring needs, focus on blurred target focus, etc., to ensure effectiveness, Improve the effect of detailed feature information

Active Publication Date: 2015-10-21
BEIJING HANBANG GAOKE DIGITAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Camera auto-focus technology is a key technology in the field of security monitoring. However, due to the complexity of monitoring scenes and the increasing application of variable-focus cameras, the traditional camera auto-focus technology that relies on setting the focus area in the screen often causes focus. The focus of the target is blurred, and the characteristic information of the target is seriously missing, which cannot meet the increasingly complex security monitoring requirements

Method used

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  • A camera auto-focus control method for moving targets
  • A camera auto-focus control method for moving targets
  • A camera auto-focus control method for moving targets

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Embodiment Construction

[0019] Such as figure 1 As shown, this camera autofocus control method for a moving target includes the following steps:

[0020] (1) Use the moving target detection algorithm based on background pruning to calibrate the moving target location area in the scene;

[0021] (2) After determining the camera focus area and focus target, the automatic focus control algorithm based on the gray gradient of the target is adopted to realize the automatic focus of the camera lens on the calibrated moving target;

[0022] Step (1) includes the following sub-steps:

[0023] (1.1) Gaussian smoothing filter preprocessing;

[0024] (1.2) Gaussian background model modeling;

[0025] (1.3) Target foreground area extraction;

[0026] (1.4) Update of the Gaussian background model;

[0027] (1.5) Mathematical morphology processing of the target foreground area;

[0028] The step (2) includes the following sub-steps:

[0029] (2.1) Extract the moving target focus area;

[0030] (2.2) Focus ...

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Abstract

The invention discloses a camera automatic focusing control method focused on a moving target. The camera automatic focusing control method comprises the steps of: 1, calibrating a moving target position region in a scene by adopting a background subtraction-based moving target detection algorithm; and 2, realizing automatic focusing of a camera lens for the calibrated moving target by adopting a target gray gradient-based automatic focusing control algorithm after determining a camera focusing region and a focusing target, wherein the step 1 comprises the following sub-steps of: 1.1, carrying out Gaussian smoothing filter preprocessing; 1.2, modeling a Gaussian background model; 1.3, extracting a target foreground region; 1.4, updating the Gaussian background model; and 1.5, carrying out mathematical morphological processing on the target foreground region; and the step 2 comprises the sub-steps of: 2.1, extracting a moving target focusing region; 2.2, calculating a focusing evaluation function; and 2.3, carrying out focusing control.

Description

technical field [0001] The invention belongs to the technical field of security monitoring, and in particular relates to a camera automatic focus control method for a moving target. Background technique [0002] Camera auto-focus technology is a key technology in the field of security monitoring. However, due to the complexity of monitoring scenes and the increasing application of variable-focus cameras, the traditional camera auto-focus technology that relies on setting the focus area in the screen often causes focus. The focus of the target is vague, and the characteristic information of the target is seriously missing, which cannot meet the increasingly complex security monitoring needs. Contents of the invention [0003] The technical problem of the present invention is: to overcome the deficiencies of the prior art, to provide a monitoring scene with self-adaptive ability, to effectively extract key moving targets, to accurately focus on key targets, and to effectivel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232H04N7/18G06T7/00
Inventor 丘江
Owner BEIJING HANBANG GAOKE DIGITAL TECH
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