POSITIONING SYSTEM USING TRIANGULATION POSITIONING BASED ON THREE PIXEL POSITIONS, A FOCAL LENGTH AND THE TWO-DIMENSIONAL COORDINATES

A positioning system for positioning a to-be-positioned device includes three or more reference objects each providing individual unique feature information associated with a two-dimensional coordinate. A positioning device includes an image capturing unit obtaining image data of three of the reference objects, and a processing unit obtaining, based on the image data, three pixel positions corresponding respectively to the three reference objects in the image data, obtaining the two-dimensional coordinate of the location of the three reference objects, and estimating a positioning coordinate of the to-be-positioned device using a triangulation positioning method based on the three pixel positions, a focal length used for obtaining the image data and the two-dimensional coordinates.