Design and Implementation of Fingerprint Sensor for Calibration of Parasitic Offset Image

Abstract

A FPGA implementation of fingerprint sensors scheme is described for removing parasitic offset image on no touch. This paper proposes an effective fingerprint identification system with 160x192 array fingerprint sensor hardware. The proposed calibration scheme initializes a fingerprint sensor LSI to eliminate the influence of offset image by the electrical characteristic difference of pixel array, which is degraded during long-time use. Each step of a fingerprint algorithm is analyzed based on FPGA. This paper designs an effective hardware scheme for using the Verilog-HDL in 160x192 pixel array. The circuit includes 3 memorys and control logic. The function is verified in RTL simulation and FPGA logic synthesis.