基于被动矩阵有机发光二极管屏的光学指纹采集系统

目前智能门锁多采用光学指纹采集系统,针对其需要发光二极管(light-emitting diode,LED)背光源,存在功耗大、发光不均匀、光学指纹模块过厚的缺点,设计一种应用自发光被动矩阵有机发光二极管屏代替LED的光学指纹采集系统,改善了以上问题.且针对该方法采集的原始图像存在屏幕发光像素干扰的问题,提出平均值消除法对原始数据进行降噪处理,大幅减小了屏幕干扰的问题,之后进行规格化、低通滤波、图像增强、二值化以及细化处理,实验仿真得到了清晰的指纹单像素图像,证明被动矩阵有机发光二极管屏幕采集指纹的可行性,为进一步应用打下基础.

Optical Fingerprint Acquisition System Based on Passive Matrix OLED Screen

Currently, the optical fingerprint collection system is widely applied in intelligent door locks with the need of LED backlight which has several drawbacks such as large power consumption, uneven light emission, and thick optical fingerprint modules. To tackle these, an optical fingerprint collection system is designed in the paper with the application of a self- luminous Passive matrix OLED screen. Also, an average value elimination method is employed to reduce the noise of the original collected image and the screen interference is obviously reduced. Then these steps, normalization, low-pass filtering, image enhancement, binarization, and thinning, are executed sequentially to obtain a clear single-pixel image of the fingerprint. Experiments and simulations show that it is feasible for Passive matrix OLED screen to collect fingerprints, which provides a platform for the further applications.