唐远炎老师的小波课件，非常完整，里面包括了小波的发展和小波的构造方法，特别讲述了小波在手写文字提取方面的一些应用-Yuan-Yan Tang teacher wavelet courseware, is very complete, which includes the development of wavelet and wavelet construction methods, in particular about the wavelet extraction of handwritten text in some applications