No image of the finger is taken or stored instead data is converted into a unique sequence of numbers that are then used to identify the candidate and cannot be converted back into an image.

扫描时不保留指纹图像，仅存储数据字符串，该字符串只能用于考生身份认证，无法恢复指纹图像。

youdao

A robust one-by-one matching algorithm, rendering between pressured data and field acquisitions of finger print image, contributed to the vi tal heart of dactylogram verification with the mouse.

核心是把现场采集的指纹特征与存储的指纹通过可靠的匹配算法验证用户身份。

youdao