摘要
设计了一个光学/数字成像系统,该成像系统利用三次位相元件辅以数字图像处理技术,在保持系统光通量及分辨率不变的前提下,提高了光学系统焦深。进行了仿真实验,实验以传统的双高斯型照相物镜为光学系统模型,选取焦点及离焦-1.6λ(λ=550 nm)近似-6.4倍焦深两个成像位置。对比分析了传统光学系统及光学/数字系统的焦点位置调制传递函数(MTF)、离焦1.6λ处调制传递函数(MTF)及在瑞利判据±100倍焦深范围内的离焦传递函数。通过光学设计软件CODEV9.7新增图像模拟功能,得到了光学系统的模拟成像结果。利用自编图像处理程序,得到最终的成像结果。结果表明,该光学/数字成像系统确实能够有效扩大光学系统焦深6倍以上。
An optical/digital imaging system is proposed. This system uses a cubic phase element and digital image processing to increase the depth of focus in keeping the same illumination and resolution. Two positions, -1.6λ(λ = 550 nm) and in focus, are analyzed in simulation. Then both modulate transformation function (MTF) and the relationship between the MTF and focus in a longer depth of focus are given. Using the imaging simulation tools CodeV, the simulation images are obtained. After digital processing, the final image is also obtained. Experimental results show that this new optical/digital system can increase the depth of focus by 6 times at least.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2007年第7期1026-1031,共6页
Optics and Precision Engineering
基金
中科院三期创新资助项目
关键词
照相物镜
光学设计
位相板
焦深
Digital signal processing
Focusing
Image resolution
Imaging systems
Lighting
Optical design
Optical transfer function
