Method for acquiring coordinate transformation matrix and positioning target in monitoring picture

A coordinate conversion matrix and acquisition method technology, applied in the field of intelligent video surveillance, can solve the problems of heavy calibration workload, complex prediction, inconvenient, etc., achieve real-time positioning and tracking and augmented reality functions, reduce difficulty, and facilitate command and dispatch Effect

Pending Publication Date: 2020-07-28
SUZHOU KEDA TECH
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Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a method for acquiring a coordinate transformation matrix and locating a target in a monitoring screen, which solves the problem that in the prior art, multiple PTZ positions ar

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  • Method for acquiring coordinate transformation matrix and positioning target in monitoring picture
  • Method for acquiring coordinate transformation matrix and positioning target in monitoring picture
  • Method for acquiring coordinate transformation matrix and positioning target in monitoring picture

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[0035] Example 1

[0036] The embodiment of the present invention provides a method for obtaining a coordinate conversion matrix, such as figure 1 As shown, including the following steps:

[0037] Step S01: Control the camera to move to a preset PTZ position, and use the PTZ position as the calibration scene.

[0038] In practical applications, the world the camera is in is three-dimensional, while the photo is two-dimensional, and the function from three-dimensional to two-dimensional is irreversible. Therefore, camera calibration is required. The goal of camera calibration is to find a suitable mathematics Model, find the parameters of this model, so that you can approximate this three-dimensional to two-dimensional process, so that the function of this three-dimensional to two-dimensional process finds the inverse function. In the embodiment of the present invention, the camera is first controlled to move to a preset PTZ position, and the preset PTZ position is determined as the...

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Abstract

The invention discloses a method for acquiring a coordinate transformation matrix and positioning a target in a monitoring picture, and the method comprises the steps: controlling a camera to move toa preset PTZ position, and enabling the PTZ position to serve as a calibration scene; selecting at least one calibration point from the calibration scene; obtaining pixel coordinates of a calibrationpoint in a camera coordinate system corresponding to the camera in the calibration scene; acquiring GPS information of the calibration point and GPS information of the camera; establishing a world coordinate system by taking the projection point of the camera on the ground as an original point, and calculating the world coordinate of the calibration point by utilizing the GPS information of the calibration point and the GPS information of the camera; calculating to obtain an external parameter matrix of a world coordinate system and a camera coordinate system by utilizing the world coordinatesof the calibration points and the pixel coordinates of the calibration points. The PTZ position does not need to be adjusted for multiple times, the calibration workload is reduced, the world coordinate of the target point can be converted into the pixel coordinate by utilizing the external parameter matrix of the conversion relationship between the world coordinate system and the camera coordinate system, and the difficulty of positioning calculation is reduced.

Description

technical field [0001] The invention relates to the technical field of intelligent video monitoring, in particular to a method for acquiring a coordinate conversion matrix and locating a target in a monitoring screen. Background technique [0002] With the progress and development of society, the application of target recognition, tracking, scene recognition and indexing is becoming more and more extensive, and people's requirements for video surveillance are also getting higher and higher. In the field of intelligent video surveillance, functions such as displaying landmark buildings in the video frame, tracking moving vehicles, and associating other monitoring equipment have been valued by major security monitoring manufacturers. Through the rich media capabilities of augmented reality tags, various Spatial relationships of class structured and unstructured data. For example: [0003] The existing technology is to calibrate around the camera by using the calibration poin...

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Application Information

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IPC IPC(8): G06T3/60G06T7/80G01C25/00G01S19/42
CPCG06T3/604G06T7/80G01C25/00G01S19/42G06T2207/10016G06T2207/30232
Inventor 姚佳丽毛晓蛟章勇曹李军
Owner SUZHOU KEDA TECH
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