ILLUMINATION SENSITIVITY OF JOINT TRANSFORM CORRELATORS USING DIFFERENTIAL PROCESSING - COMPUTER-SIMULATION AND EXPERIMENTAL STUDIES

Differential and binary differential joint-transform correlators are f ound to be associated with high tolerance to illumination variation of the reference and target. This makes them suitable for illumination-i ndependent pattern recognition applications. Computer simulation resul ts show that a tolerance limit as high as an amplitude ratio of 0.25 b etween the target and the reference image can be attained. As a refine ment to the above mentioned techniques, we suggest the use of isotropi c difference operators. We also present some experimental results For the differential type JTCs. (C) 1998 Elsevier Science B.V.