1. A method of estimating at least one dimension of a target object within a digital image which includes a reference object having a fiducial pattern printed thereon placed substantially in a plane of the target object, the method comprising: obtaining a digital image containing the target object and the reference object; locating the reference object in the digital image utilizing the fiducial pattern; calculating a pixel scale factor based on both measured and known dimensions of the reference object; locating the target object in the digital image; and calculating the at least one dimension of the target object based on the pixel scale factor.