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在兼顾图像恢复能力的基础上,将不同物距下点扩展函数相似性的评价函数费希尔信息量(Fisher Information,FI)应用到波前编码实际光学系统相位板的优化设计中。在焦距和孔径之比为3、有效焦距为100 mm的无穷远成像的双胶合系统的基础上,设计得到了双胶合-波前编码系统。通过解码前后的点扩展函数模拟和实验结果表明,该系统在5 m到无穷远的物距范围内很好地调制了系统的点扩展函数,使得它对物距不敏感。最后通过对位于5 m,10 m和15 m的三人分别进行传统双胶合成像和双胶合-波前编码系统的成像实验对比,有力地证明了双胶合系统的清晰成像的物距范围从10 m到无穷远扩展到5 m到无穷远,这使得光学系统景深得到很大的延拓。
Based on the ability of image restoration, Fisher Information (FI), an evaluation function of the similarity of point spread functions under different object distances, is applied to the optimal design of the phase plate of the actual optical system of wavefront coding. Based on the dual-gluing system of infinity imaging with a focal length to aperture ratio of 3 and an effective focal length of 100 mm, a double gluing-wavefront coding system was designed. The simulation results and the experimental results of the point spread function before and after decoding show that the system can well modulate the point spread function of the system from 5 m to infinity, making it insensitive to object distance. Finally, the contrast experiments of traditional double gluing and double gluing-wavefront coding systems for three persons located at 5 m, 10 m and 15 m, respectively, strongly demonstrate that the clear distance between the two gluing systems ranges from 10 The extension of m to infinity to 5 m to infinity makes the depth of field of the optical system greatly extended.