Patent ID: 8159459
Filing Date: 2012-04-17
Classification: G06F

Abstract:
1. A coordinate positioning system with in-the-air positioning function for an LCD display unit, comprising: an illuminator, which produces a directional light; and an image sensor, which senses the directional light and produces an image corresponding to the directional light to accordingly analyze the image to obtain a rotating angle corresponding to the directional light, wherein the image sensor includes: an image sensing unit, which converts the directional light into an electrical signal, and produces an image corresponding to the directional light according to the electrical signal; and a processing unit, which is connected to the image sensing unit, wherein the processing unit comprises: a bi-level image processor, which is connected to the image sensing unit, in order to perform the bi-level image pre-processing on the image and to further produce the bi-level image; an image object capturing device, which is connected to the bi-level image processor in order to capture the image objects corresponding to the directional light from the bi-level image and to produce a working image object; and a computation device, which is connected to the image object capturing device, in order to compute a direction of the working image object to accordingly produce the rotating angle corresponding to the directional light, wherein the computation device produces the rotating angle according to the direction and a predetermined vector, and the rotating angle θ is expressed as: Where ‘{right arrow over (A)}’ indicates a vector of the direction, ‘{right arrow over (B)}’ indicates the predetermined vector, ‘|{right arrow over (A)}|’ indicates a length of the vector, ‘|{right arrow over (B)}|’ indicates a length of the predetermined vector, and ‘●’ indicates an inner product operation.