在天文像复原“迭代位移叠加法”中,判定其迭代过程发展的方向和收敛结果是否正确是关键问题。根据斑点掩模法中目标重谱与目标像间的相互对应的性质,用目标重谱作为检验迭代结果的标准函数。用最小二乘法鉴别迭代过程的发展方向和收敛结果,因而可避免迭代过程的盲目性,并将得到正确复原像。

In the method of iterative shift-and-add for astronomical image reconstruction, a key problem is to determine whether the developing direction and the convergence result of the iterative process are correct. According to the properties that an object bispectrum corrsponds to the image of the object in speckle masking method, the object bispectrum is adopted as the standard function to test the iterative results. The method of least-square is used to distinguish the developing direction and convergence result of the iterative process, so that the blind action of the iterative process can be avoided and a correct reconstructed image will be got.