1. An optical pointing system, comprising: a first light source disposed on a first location of an object and configured to provide a first light whose wavelength is within a first predetermined range; a second light source disposed on a second location of the object and configured to provide a second light whose wavelength is within a second predetermined range different from the first predetermined range; an image receiver comprising: a first optical detector configured to detect optical signals of the first light source for generating a corresponding first image, the first optical detector including at least one pixel covered by a first optical coating for blocking light whose wavelength is not within the first predetermined range; and a second optical detector configured to detect optical signals of the second light source for generating a corresponding second image, the second optical detector including at least one pixel covered by a second optical coating for blocking light whose wavelength is not within the second predetermined range; and an analyzing unit configured to acquire a relative position of the image receiver with respect to the object according to at least the first image and the second image.