重庆工学院的余成波写的关于手指静脉图像处理和匹配识别的文章，年限从2009年至今，在手指静脉识别领域具有一定的参考价值-Chongqing Institute of YU Cheng-bo wrote on finger vein image processing and matching recognition of the article, period from 2009 to date, finger vein recognition field has a certain refere

There a lot of time–frequency methods used for studying the time–frequency distribution of the nonlinear and non-stationary signal, such as short time Fourier transform (STFT) (Zhang and Bao, 1998), Wavelet transform (WT) (Hu et al., 2009), S-transfo