1. A method of obtaining three-dimensional information for one or more target objects is provided, characterized in that it comprises the steps of: (a) selecting one or more target objects; (b) illuminating the one or more target objects using a first light source at a distance X 1 from the one or more target objects, and capturing an image I 1 of the one or more target objects using at least one camera device; (c) illuminating the one or more target objects using a second light source at a distance X 2 from the one or more target objects, and capturing an image I 2 of the one or more target objects using the at least one camera device; and (d) calculating the distance X between the first and second light sources, and the one or more target objects, based on the decay of intensities of light sources over distances X 1 and X 2 , using the ratio of the image intensities between the images I 1 and I 2 .