1. A method of calibrating a contour, the method performed by a data processor, the method comprising: designing a pattern, wherein the pattern includes a designed anchor pattern and a designed verification pattern to be printed onto a substrate; collecting scanning electron microscope (SEM) data of a printed anchor pattern on the substrate, wherein the SEM data includes a SEM image of the printed anchor pattern on the substrate; converting the SEM image of the printed anchor pattern on the substrate into a SEM contour of the printed anchor pattern; analyzing the SEM contour of the printed anchor pattern; and aligning the SEM contour of the anchor pattern, to calibrate the SEM contour.