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Computational Imaging

   In conventional optical imaging systems, objects are directly imaged to the image space by imaging optics. By contrast, in computational imaging (or computational photography), objects are imaged by a combination of optical encoding and computational decoding. In the scheme, the flexibility of design of an imaging system is enhanced compared with that in the conventional systems. Therefore, the scheme has a potential for overcoming fundamental limits in the conventional imaging systems which include, e.g., field-of-view, depth-of-field, size of the hardware, pixel count, spatial resolution, spectral resolution, dimension of sensed optical information, speed of imaging.
Currently our group is pioneering novel design of computational imaging systems and new applications of such systems. Especially, now we are focusing on the development of ultra-compact imaging hardware by means of the lensless imaging technique.
 

Publications 

  1. Xiuxi Pan, Xiao Chen, Saori Takeyama, Masahiro Yamaguchi. Image reconstruction with transformer for mask-based lensless imaging, Optics Letters, Vol. 47, Issue 7, pp. 1843-1846, Mar. 2022.
  2. Xiuxi Pan, Xiao Chen, Tomoya Nakamura, Masahiro Yamaguchi. Incoherent reconstruction-free object recognition with mask-based lensless optics and Transformer, Optics Express, Vol. 29, Issue 23, pp. 37962-37978, Oct. 2021. 
  3. Xiuxi Pan, Tomoya Nakamura, Xiao Chen, Masahiro Yamaguchi. Lensless inference camera: incoherent object recognition through a thin mask with LBP map generation, Optics Express, Vol. 29, Issue 7, pp. 9758-9771, Mar. 2021.
  4. Xiao Chen, Tomoya Nakamura, Xiuxi Pan, Kazuyuki Tajima, Keita Yamaguchi, Takeshi Shimano, Masahiro Yamaguchi. Resolution improvement in FZA lensless camera by synthesizing images captured with different mask-sensor distances, 2021 IEEE International Conference on Image Processing, pp. 2808-2812, Sep. 2021. 
  5. Fumino Matsui, Fumiaki Watanabe, Tomoya Nakamura, Masahiro Yamaguchi. Unmixing of the background components in an off-axis holographic-mirror-based imaging system using spectral image processing, Optics Express, OSA Publishing, Vol. 28, Issue 26, pp. 39998-40012, Dec. 2020. 
  6. Tomoya Nakamura, Takuto Watanabe, Shunsuke Igarashi, Xiao Chen, Kazuyuki Tajima, Keita Yamaguchi, Takeshi Shimano, Masahiro Yamaguchi. Superresolved image reconstruction in FZA lensless camera by color-channel synthesis, Optics Express, Osa Publishing, vol. 28, Issue 26, pp. 39137-39155, Dec. 2020. 
  7. Syukran Hakim Bin Norazman, Tomoya Nakamura, Masahiro Yamaguchi. Digital holography-assisted 3-D bright-field image reconstruction and refocusing, Optical Review, Vol. 27, issue 6, pp. 455-464, Sept. 2020. 
  8. Tomoya Nakamura, Keiichiro Kagawa, Shiho Torashima, Masahiro Yamaguchi. Super Field-of-View Lensless Camera by Coded Image Sensors, Sensors, MDPI, Vol. 19, No. 6, 1329, Mar. 2019. 
  9. Tomoya Nakamura, Masahiro Yamaguchi. Computational imaging utilizing volume hologram, The 4th Biomedical Imaging and Sensing Conference 2018 (BISC2018), Proc. SPIE, 10711, 107110H, Apr. 2018.