High-speed fingerprint verification using an optical correlator

A real-time, VanderLugt-type optical correlator using a single SLM is devel oped. A field programmable gate array is used to capture and process images obtained from a CCD camera at a rate of 60 video fields/s. During both enr ollment and verification, a finger slides over a glass prism and is input t o the system via the frustration of the total internal reflection process. An autoenrollment procedure captures the optimal image during each slide. A n optimal composite filter is implemented. The correlation detection proces s comprises real-time tracking of the correlation peak while the finger is sliding and a decision process based on projective decision boundaries. Rea l-life tests yielded a false rejection rate of 1% and a false acceptance ra te of 0.2%. (C) 1999 Society of Photo-Optical Instrumentation Engineers. [S 0091-3286(99)00901-0].