Motion detection and positioning photography method and device thereof

A motion detection and motion technology, applied in color TV parts, TV system parts, TV and other directions, can solve problems such as existing problems, no calculation method, manual setting, and no consideration, etc.

Inactive Publication Date: 2014-05-07
CHINA SECURITY & FIRE TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent can automatically detect the stand-up movement of the speaker and students and allow the camera to automatically position and aim at the speaker, but this method has the same threshold for the whole classroom scene (the threshold needs to be manually set according to the actual situation, and does not take into account the different positions of the classroom. The fact that the threshold is different) to judge the problem of detecting the stand-up movement of the speaker student, and whether the subsequent camera rotation control is accurate (the specific calculation method of the horizontal rotation angle and the vertical rotation angle is not given, and the calculation of the focal length f also needs to rely on manual input of parameters) is also problematic

Method used

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  • Motion detection and positioning photography method and device thereof
  • Motion detection and positioning photography method and device thereof
  • Motion detection and positioning photography method and device thereof

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Experimental program
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Embodiment 1

[0066] see figure 1 , the embodiment of the present invention provides a method for motion detection and positioning shooting, including the following steps:

[0067] S102. Obtain a camera model according to the internal parameter matrix and the external parameter matrix of the camera.

[0068] S104. Obtain a threshold value of the number of pixels in the image when the moving body moves to a preset height or length.

[0069] Specifically, the preset height or length is related to the actual application scene. For example, in the teaching intelligent recording and broadcasting system, the preset height or length is related to the height of the students when they are sitting and standing. In the conference recording and broadcasting system Among them, related to the height of the speaker when sitting down and standing, different preset heights can be set according to the different heights of the speakers at different positions in the classroom or conference room.

[0070] S10...

Embodiment 2

[0075] see figure 2 A method for obtaining a camera model provided by a preferred embodiment of the present invention includes the following steps:

[0076] S1022. Calculate the internal parameter matrix of the camera through the internal parameters of the camera;

[0077] Specifically, establish the correspondence between the coordinates of the space point in the camera coordinate system and the coordinates of the image point on the image plane: m=K(I,0)X C =PX C

[0078] Among them, X C Indicates the homogeneous coordinates of the spatial point in the camera coordinate system, I is a 3×3 unit matrix, m indicates the homogeneous coordinates of the image point on the image plane, and the internal parameter matrix is:

[0079] K = f x s u 0 ...

Embodiment 3

[0092] see image 3 , a method for obtaining a pixel number threshold provided by a preferred embodiment of the present invention includes:

[0093] S1042. Obtain the image point coordinates of the moving body on the image plane when the initial state is obtained, and input the spatial coordinates when the camera model obtains the initial state;

[0094] Specifically, the initial state includes the state of the moving body when it initially moves.

[0095] S1044. Input the spatial coordinates of the moving body when it moves to a preset height or length in the camera model, and obtain the image point coordinates predicted to move to the preset height or length on the image plane;

[0096] S1046. Obtain a threshold value of the number of pixels on the image plane according to the image coordinates of the moving body in the initial state on the image plane and the image coordinates that have moved to a preset height or length.

[0097] The method for obtaining the pixel number...

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Abstract

The invention discloses a motion detection and positioning photography method and a device thereof, which belongs to the field of video monitoring. The method comprises the steps that a camera model is acquired according to an internal parameter matrix and an external parameter matrix of a camera; the threshold of the number of pixels in an image when a motion body moves a preset height or length; according to the value of the number of the pixels and the threshold of the number of the pixels of the current image, whether the motion body moves to the preset height or length is judged; and when the motion body moves to the preset height or length, the rotation angle of the camera is adjusted and the focal length is zoomed to control the center of the motion body in the image plane. According to the embodiment of the invention, by constructing the internal parameter matrix and the external parameter matrix of the camera, self-adaption is carried out to judge whether the motion body moves to the preset height or length; and the rotation angle of the camera is controlled and the focal length is zoomed to control the center of the motion body in the image plane, thus the motion body is photographed through positioning tracking.

Description

technical field [0001] The invention relates to the technical field of video surveillance, in particular to a method and device for motion detection and positioning shooting. Background technique [0002] Educational informatization has been paid more and more attention by education authorities, among which the teaching intelligent recording and broadcasting system is an important part of education informatization. According to the requirements of the national "three links and two platforms" construction, the teaching intelligent recording and broadcasting system needs to monitor the teaching interaction behavior of students during the teaching process, especially when the students speak, the recording and broadcasting system needs to zoom in and record the video, It will involve the judgment of the students' standing up action and the positioning of the camera in the classroom scene. [0003] In the traditional classroom scene, the judging of the students' standing action ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232
Inventor 张欢吴金勇陈先开王军
Owner CHINA SECURITY & FIRE TECH GRP
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