Calibration algorithm for under-display optical fingerprint sensor

摘要

We present in this work a calibration method for under-display optical fingerprint sensor. Sources of nonuniformity incaptured raw images are analyzed, which are attributed to Moiré fringe and rear leakage of pixel luminance. Analgorithm is proposed to filter the fingerprint image based on two pre-stored frames measured with standard reflectingsurfaces. As a result, clear fingerprint images are obtained from an under-OLED optical sensor.