使用OpenCV实现的基于离散傅里叶变换的文本图像旋转校正
DFT-based text image rotation correction using OpenCV
需要OpenCV环境
Need OpenCV environment
可以在我的博客内阅读详细原理：
You can read my article about this at:
http://johnhany.net/2013/11/dft-based-text-rotation-correction/ (written in Chinese)