说明：  基于离散余弦变换的最小二乘法相位解包裹(DCT),peaks生成包裹相位图，用LS-DCT解包裹得到去包裹的真实相位图
(Based on Discrete Cosine Transform method of least squares phase unwrapping (DCT), peaks generated wrapped phase diagram obtained by LS-DCT unwrapping unwrapping the true phase diagram)