Optical 2D correlation identification in security applications: discussion

The optical method JTC (2D correlation) is a very efficient tool in the field of possible identification approaches. Originally suggested by Weaver and Goodman (1966) the JTC concept has been widely applied and many modifications has appeared during last years. The practical implementation is strongly limited by a sensitivity of correlation peak value to possible distortions and artifacts. The paper summarizes relevant results of our experiments on the 2D optical (JTC) correlation identification setup published on previous Carnahan conferences. Apart of already tested distortions and effects (zoom, dilation, rotation, partial picture, noise etc.) the influence of reduced resolution and image preprocessing such as filtering has been tested and the evaluation of these artifacts has been done as a final part of our experiments. The most important criterion for the selection of artifacts has been an importance in practical use. As in the previous papers the JTC setup has applied to the set of fingerprints and faces, Finally an overview and a summarizing discussion are presented to show the limits of practical applications of the 2D correlation identification technique.