Next generation signal processing for embedded sensor system

  • 廣林, 茂樹 (Principal Investigator)

Project Details

Abstract

A new processing technique called non-harmonic analysis (NHA) is proposed for optical coherence tomography (OCT) imaging. Conventional Fourier-domain OCT employs the discrete Fourier transform (DFT), which depends on the window function and length. The axial resolution of the OCT image, calculated by using DFT, is inversely proportional to the full width at half maximum (FWHM) of the wavelength range. The FWHM of wavelength range is limited by the sweeping range of the source in swept-source OCT and it is limited by the number of CCD pixels in spectral domain OCT. However, the NHA process does not have such constraints; NHA can resolve high frequencies irrespective of the window function and the frame length of the sampled data. To demonstrate the benefits of using NHA for OCT, we perform OCT imaging with NHA of an onion skin. The results reveal that NHA can achieve an image resolution equivalent that of a 100-nm sweep range using a significantly reduced wavelength range. They also reveal the potential of using this technique to achieve high-resolution imaging without using a broadband source.
StatusFinished
Effective start/end date2009/01/012011/12/31

Funding

  • Japan Society for the Promotion of Science: ¥18,330,000.00

Keywords

  • 情報センシング
  • 信号処理
  • フーリエ変換
  • 分解能
  • センシング
  • Non-harmonic analysis applied to optical coherence tomography imaging

    Cao, X., Uchida, T., Hirobayashi, S., Chong, C., Morosawa, A., Totsuka, K. & Suzuki, T., 2012/02, In: Japanese Journal of Applied Physics. 51, 2 PART 1, 022503.

    Research output: Contribution to journalArticlepeer-review

    20 Scopus citations
  • The simulation for accuracy validation of OCT based non-harmonic analysis

    Uchida, T., Cao, X., Hirobayashi, S., Misawa, T., Yoshizawa, T., Chong, C., Morosawa, A. & Suzuki, T., 2011, Proceedings - 2011 4th International Conference on Biomedical Engineering and Informatics, BMEI 2011. p. 532-535 4 p. 6098300. (Proceedings - 2011 4th International Conference on Biomedical Engineering and Informatics, BMEI 2011; vol. 1).

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

  • Evaluation of wide area sound control system using power envelope inverse filtering

    Nakada, R., Hirobayashi, S., Yoshizawa, T. & Misawa, T., 2010, ICALIP 2010 - 2010 International Conference on Audio, Language and Image Processing, Proceedings. p. 383-389 7 p. 5684576. (ICALIP 2010 - 2010 International Conference on Audio, Language and Image Processing, Proceedings).

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review