数字全息成像中往往包括再现像、共轭像和零级项，再现像的分离是常见而又难以彻底解决的问题。提出一种新的全息图重建算法，即利用相干衍射成像（CDI）中的迭代方法处理数字全息图，实现仅有一个实像的再现结果,从而彻底解决该问题。该方法包括两个步骤：首先通过CCD分别测量样品单独存在、样品和参考光同时存在以及参考光的远场衍射分布；然后通过计算机进行迭代运算。由于干涉光的存在，该算法比传统的CDI算法有更快的收敛速度和重建质量。同时进行了数值模拟验证并对生物切片进行了物像重建。

In order to distinguish real image from conjugate image and zero-order term in digital hologram, a new method of image reconstruction is proposed. This method using the theory of coherent diffraction imaging (CDI) reconstructs accurate image without zero-order diffraction and conjugate image. The method proposed includes two processes: the first is to measure the object intensity distribution, the hologram and the reference light intensity distribution; the second is the reconstruction of object by using computer. The convergence speed and image quality are improved because of the coherent light. Basic principle and simulation result are described. And the experiment of image reconstruction of biological sample plates is carried out.