1. An image recognition method, executed in an image recognition system, for recognizing objects of interests in an image, wherein the image recognition system has an analysis module, the image recognition method comprising: (a) detecting, by the analysis module, a directional edge of the image according to an edge operator; (b) enhancing, by the analysis module, the directional edge of the image; (c) inverting, by the analysis module, a color level of the image after the directional edge has been enhanced; and (d) searching, by the analysis module, for a target object image according to a profile setting value in the image after the color level has been inverted, wherein the profile setting value corresponds to a connected object.