Face recognition by the use of an optical parallel single-channel hit-miss transform processor

A new algorithm in which the defined hit-miss transform is reformulated by a gray-scale erosion of the image with a gray-scale structural element of three levels was developed. A necessary condition was defined to choose the correct intermediate gray-scale in the structural element. Then a single-channel incoherent optical correlator with only an image and a structural element was developed to execute the hit-miss transform in parallel by one step thresholding. Experimental results for the face recognition were demonstrated.