1. A method comprising: providing depth information of a target acquired by an image capturing system; determining real-time three-dimensional information of a target object in a predetermined inspecting area based on the depth information of at least one real-time image of the target; projecting color pixel information of a real-time color image of the target object to a three-dimensional virtual model based on the real-time three-dimensional information, the real-time color image acquired by a color camera system; and generating a color three-dimensional virtual model, wherein the color three-dimensional virtual model comprises the color pixel information.