本文基于二维快速傅里叶方法的基本原理提出了一种新的相位解包算法——菱形种子算法¬ 。该算法通过识别一个种子点，然后依次向相邻四点扩展，再把这四个点作为第二批种子点，依次向各自的四点邻域扩展，以菱形轨迹遍历所有的有效信息点，以到达整幅图像的相位解包。- A new algorism of phase unwrapping for measuring the material object is proposed based on the FFT method——algorism of diamond phase unwrapping, this algorism identifies a seed point, seed points spread to four points nearby the fist seed point, the four points will serve as the second group of seed points, seed points spread to four points nearby the second group of seed points in turn, pass through all of the effective information points by a diamond path. Seed points will eventually bring about the phase unwrapping in the entire image.