Abstract
In image processing, the wavelet transform is useful to enhance the local features of images, so that, the correlation of a target with a reference signal can be improved by wavelet filtering. The wavelet filtering operation and correlation can be photorefractively performed if a crystal is used as a dynamic holographic recording medium. In particular, the sillenite family of photorefractive crystals have a high photosensitivity and high carrier mobility which allow a fast response that makes them attractive for real-time image processing and optical phase conjugation. We analyze a real-time wavelet-matched optical correlator using phase conjugation in a four-wave mixing arrangement. The robustness of the correlator to the noise due the finite crystal depth is improved using a proper wavelet filter.
Original language | English |
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Article number | 90 |
Pages (from-to) | 475-480 |
Number of pages | 6 |
Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 5622 |
Issue number | PART 1 |
DOIs | |
State | Published - 2004 |
Event | RIAO/OPTILAS 2004: 5th Iberoamerican Meeting on Optics, and 8th Latin American Meeting on Optics, Lasers, and their Applications; ICO Regional Meeting - Porlamar, Venezuela, Bolivarian Republic of Duration: 3 Oct 2004 → 8 Oct 2004 |
Keywords
- Four-wave mixing
- Photorefractive
- Reflection gratings
- Wavelet filtering