Motion detection and positioning photography method and device thereof

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 ...

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

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