For non-Chinese readers:
I'm a software engineer in Shanghai, China. Since I bought a Raspberry Pi, I spent some spare time on it and I'm glad to share something with Pi users all over the world, so this article has two languages: Chinese & English, and I try to translate the Chinese to English as accurately as possible, but, there might be some translation mistakes, so if you don't know what I mean in the article, just leave a comment, and I'll reply when I get an answer. Also welcome to contact me via Email.
Raspberry Pi是什么？简单地说，它就是一个基于ARM CPU的、信用卡那么大的迷你计算机。
In short, Pi is an ARM-based mini computer which has a credit card size.
本文主要内容：
在Raspberry Pi上，通过调用OpenCV库，自己写一个简单的C程序来控制摄像头拍照，并保存图片。
在阅读本文之前，请确保你已经阅读过我的另一篇配置Pi的文章，因为本文是在它的基础上进行的。
The main content of this article:
Write a simple C program by invoking the OpenCV library on Raspberry Pi to control a webcam to take photos & save them.
Before reading this article, please make sure that you've read my another article about Pi configuration, because this article is based on that.