分类问题是利用已知类别的样品（训练集）来构造分类器，其训练集样品是已知类别的，所以又称为有监督学习。

排序 canny边缘检测算子的c源代码 -Sort canny edge detection operator c source code

Optical character recognition, usually abbreviated to OCR, is the mechanical or electronic conversion of scanned images of handwritten, typewritten or printed text into machine-encoded text. It is widely used as a form of data entry from some sort of

提取五种Haar特征，包括对角特征、线性特征和边缘特征，并进行全部样本特征值大小排序，画特征值变化曲线-Extraction five kinds of Haar features, including the corner features, linear features and edge features, and the total sample size of the sort characteristic value, characteristic value curve Video