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A 500-dpi cellular-logic processing array performs all fingerprint identification steps on one chip, from image acquisition, enhancement, to verification. Morphological functions for executing these steps are implemented in a 30×50-μm2 processing unit. A single-cycle datapath and a shared logic structure enable compact implementation of the processing unit. A fabricated 224×256-pixel fingerprint identification LSI demonstrates fully-functional image processing and practical accuracy of identification.