中文说明：此代码是近年来稀疏表示中训练字典用的经典算法，可以用于图像去噪和超分辨重建，求解稀疏表示系数有基追踪算法（BP）和正交匹配追踪算法（OMP），还有实例应用，很好的东东。
English Description：
This code is a classical algorithm for sparse in recent years training in the dictionary that can be used for image denoising and Super-resolution reconstruction, basis pursuit algorithm solving sparse representation coefficient (BP) and orthogonal matching pursuit algorithm (OMP), and application, very good stuff.