US Patent 9354045 Image based angle sensor

A method of image-based positioning is provided. The method comprises: (A) providing an image-capturing device integrated with an object; (B) providing a pattern-generating device configured to generate a set of patterns; (C) locating the pattern-generating device in a field of view (FOV) of the image-capturing device and capturing an image of the pattern-generating device; (D) generating at least one set of pattern data by using the captured image of the pattern-generating device; and (E) processing each set of generated pattern data by using in order to generate an altitude and/or angular coordinates of the object.