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Aperture shape dependencies in extended depth of focus for imaging camera by wavefront coding

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Abstract

Optical transfer functions (OTFs) on various directional spatial frequency axes for cubic phase mask (CPM) with circular and square apertures are investigated. Although OTF has no zero points, it has a very close value to zero for a circular aperture at low frequencies on diagonal axis, which results in degradation of restored images. The reason for close-to-zero value in OTF is also analyzed in connection with point spread function profiles using Fourier slice theorem. To avoid close-to-zero condition, square aperture with CPM is indispensable in WFC. We optimized cubic coefficient α of CPM and coefficients of digital filter, and succeeded to get excellent de-blurred images at large depth of field.

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Acknowledgments

The authors thank Professor S. Komatsu for his valuable advices and appreciate E. Noguchi for her assistance in our experiments.

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Authors and Affiliations

  1. Yokohama Research Laboratory, Hitachi, Ltd., Yokohama, Kanagawa, 244-0817, Japan

    Koichi Sakita, Mitsuhiko Ohta & Takeshi Shimano

  2. Finetech Division, Hitachi Maxell Ltd., Watari, Miyagi, 989-2383, Japan

    Akito Sakemoto

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  1. Koichi Sakita
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  2. Mitsuhiko Ohta
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  3. Takeshi Shimano
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  4. Akito Sakemoto
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Correspondence to Koichi Sakita.

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Sakita, K., Ohta, M., Shimano, T. et al. Aperture shape dependencies in extended depth of focus for imaging camera by wavefront coding. Opt Rev 22, 9–18 (2015). https://doi.org/10.1007/s10043-015-0038-0

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  • DOI: https://doi.org/10.1007/s10043-015-0038-0

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