散焦一直是影响成像系统成像质量的主要问题之一。分析了不同光路上存在散焦对无透镜鬼衍射成像的影响, 比较了散焦对无透镜鬼衍射成像和传统成像两者之间的差异。在前期理论研究基础上, 对无透镜鬼衍射和传统成像的强度函数做了进一步分析, 结果表明散焦的效果相当于物体的透射函数在相位上增加一个啁啾调制, 使得两种成像系统在一定程度上是等价的。

Defocusing has been one of the major problems affecting the imaging quality of imaging systems. The influence of defocusing on the optical path on the different optical paths is studied, and the effects of defocusing on lensless diffraction and conventional imaging are compared. In addition, based on the previous theoretical research, the intensity function of lensless ghost diffraction and traditional imaging were analyzed, the results show that the effect of defocusing on lensless diffraction and conventional imaging is that there is a phase of the transmission function of the object Chirp system, which makes the two imaging systems to some extent equivalent.