基于相位差异的图像复原方法

Image Restoration Based on Phase Diversity

相位差异法利用焦面和离焦通道图像存在的固定离焦相位差为先验信息,联合估计波前相位和目标。本文设计了相位差异图像复原实验,利用变形镜模拟大气湍流扰动,通过Offner反射镜搭建反射式成像系统,消除了色差影响和简化了实验光路。实验结果表明,恢复后图像的分辨率提高了12%,验证了相位差异法提高图像分辨率和解算波前相位的能力。因此该方法是大口径光电成像系统克服波前畸变较为理想的图像恢复技术。

Phase Diversity （PD） method estimates both the wave-front phase and object by two focused and defocused images with known phase as the prior information. An image restoration experiment by using PD method was designed. The wave-front phase aberration caused by atmosphere turbulence was simulated by using the deformable-mirror. Due to simplifying the optical system and eliminating the effect of chromatic aberration,the Offner reflector was used to design the reflective imaging system. Experiment results indicate that, compared with the origin image, the resolution of the restored image can increase by 12% and the ability of improving image resolution and phase estimation is verified. So the proposed method can be used as a good means to restore the degradative images in the large aperture telescope.