【摘要】 从大景深成像系统实际所需要的景深、分辨率以及最小调制传递函数MTF响应值出发,本文建立了相位模板的个性化优化设计模型。在设计景深、分辨率范围内,以保证系统的MTF值大于设定的最小MTF响应值为优化限制条件,以不同离焦对应的光学传递函数的Fisher信息的积分作为优化目标函数。对波前编码系统的立方相位模板CPM和指数相位模板EPM进行了几组优化设计。同时,给出了后续的图像复原滤波器表达式。结果表明,得到的个性化相位模板和图像复原的结合,能够满足系统的实际需求,系统总的传递函数接近衍射受限系统的传递函数。更多还原

【Abstract】 A customized optimization model of phase plate for Extended Depth of Field (EDOF) is introduced based on the various requirements of different EDOF optical imaging system. The requirements contain customized DOF,resolution and minimum Modulation Transfer Function (MTF) value. In the optimization model,insure that the related MTF values is bigger than the minimum MTF value,and the integration of the Fisher information of the Optical Transfer Function (OTF) in the designed range is employed as the optimization target function. Then we optimize the cubic phase plate of the wavefront coding system and the exponential phase plate for several practical requirements. The subsequent image restoration filter is also introduced in the paper. The results show that the combination of the customized phase plate from the optimization model and the restoration filter can meet the requirements of system. And the whole MTF of the system is near the diffraction-limited system’s MTF.更多还原