中文说明：本程序实现选定图像的Haar-like特征提取功能，方便学习者能直观的看到各类Haar-like特征值。代码简单易于理解。
English Description：
This program realizes the Haar like feature extraction function of the selected image, which is convenient for learners to see all kinds of Haar like feature values intuitively. The code is simple and easy to understand.