A Scanning Method for Industrial Data Matrix Codes marked on Spherical Surfaces

摘要

In this paper we provide a method to localize the modules of the industrial Data Matrix Code (DMC) marked on curved surfaces. An imaginary grid of points is constructed which has the same orientation as the surface. The imaginary grid is projected on to the image and according to this grid the modules of the code are scanned. If the surface considered is not a perfect sphere then the results are not accurate. To overcome this using an error correction based on the assumed centers and the computed centers a better approximation is obtained. Using this method we can localize the modules irrespective of the camera view or orientation of the DMC.