A PTZ camera monocular zoom-based alarm positioning method

Abstract

The application provides a PTZ camera monocular zooming alarm positioning method. First, a pixel coordinate system and an image coordinate system are established; then, image information is collected by using a PTZ camera, and image matching is carried out on a target, and matching point coordinates are obtained by using an ideal zooming model condition correction; the pixel coordinates are converted into image coordinates, three-dimensional coordinates of the target in a camera coordinate system are calculated according to a zooming model, and the distance of the target can be obtained by using a three-dimensional distance formula; finally, the coordinates of the target in the camera coordinate system are converted into world coordinates, and ECEF coordinates are converted into LLA coordinates. On the basis of image matching, the pixel position of the target projection matching point can be directly used to calculate the coordinates of the target relative to the camera without knowing the longitude and latitude of the target, so that the distance measurement is realized; meanwhile, the longitude and latitude of the target can be further calculated by using the camera position information, so that the monocular positioning is realized.

Images