YANG Hao-ming, ZHANG Xin, FANG Zhi-liang, et al. Design of a photographic objective using cubic phase plate[J]. Optics and precision engineering, 2007, 15(7): 1026-1031.
YANG Hao-ming, ZHANG Xin, FANG Zhi-liang, et al. Design of a photographic objective using cubic phase plate[J]. Optics and precision engineering, 2007, 15(7): 1026-1031.DOI:
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
-1.6
λ(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.