Transactions of the Society of Information Storage Systems (정보저장시스템학회논문집)

The Society of Information Storage Systems (정보저장시스템학회)
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Experimental realization of an imaging system using wavefront coding in mobile phone camera

휴대폰용 카메라 모듈에서 파면코딩을 통한 이미지 시스템 실험구현

  • 김종필 (연세대학교 대학원 정보저장공학과) ;
  • 이상혁 (연세대학교 대학원 정보저장공학과) ;
  • 박노철 (연세대학교 기계공학부) ;
  • 박영필 (연세대학교 기계공학부) ;
  • 박경수 (연세대학교 기계공학부)
  • Published : 2009.03.25
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Abstract

We describe the experimental realization of image system using wavefront coding in 3-Mega pixel mobile phone camera. We designed aspheric lens to extend the depth of field (DOF) using wavefront coding. In addition, through the aspheric lens and lens barrel manufacturing, we obtained a raw image from a camera module. In our method, the acquired images are restored in the spatial frequency domain using the proposed filter and the spatial frequency response (SFR) is calculated. The proposed filters are composed of image denoising filter using low band pass filter in frequency domain and restoration filter for image restoration. Finally, we achieve an enhanced image by super-resolution image processing. Visual examples are given to demonstrate the performance of the proposed filter.

Keywords

References

  1. E. R. Dowski, Jr. and W. T. Cathey, 1995, "Extended depth of field through wave-front coding", Applied Optics, Vol. 34, Issue 11, pp. 1859-1866. https://doi.org/10.1364/AO.34.001859
  2. S. S. Sherif, E. R. Dowski, and W. Thomas Cathey . 2001, "A logarithmic phase filter to extend the depth of field of incoherent hybrid imaging systems", Proc.SPIE, 4471 272.
  3. S. S. Sherif, W. T. Cathey, and E. R. Dowski, 2004, "Phase Plate to Extend the Depth of Field of Incoherent Hybrid Imaging Systems", Applied Optics, Vol. 43, Issue 13, pp. 2709-2721. https://doi.org/10.1364/AO.43.002709
  4. Q. Yang, L. Liu, and J. Sun, 2007, "Optimized phase pupil masks for extended depth of field", optical communications, 272 56.
  5. S. Mezouari, A. R Harvey, 2001, "Wavefront coding for aberration compensation in thermal imaging systems", Proc. SPIE, 4442 34.
  6. A. Castro, J. Ojeda-Castañeda, 2004, " Asymmetric phase masks for extended depth of field", Applied Optics, Vol. 43, No. 17.
  7. H. Cai, C. Fang, L. Fan, Z. Huang, Yinxin Zhang, 2004, "A new kind of phase mask and its properties using in wavefront coding systems", Proc. of SPIE Vol. 7156 715601-1
  8. S.-H Lee, N.-C Park, Y.-P Park, 2008, "Breaking diffraction limit of a small f-number compact camera using wavefront coding", Optics Express, Vol. 16, No. 18.