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17 November 2010 Compensation for pixel mismatch based on a three-pixel model in volume holographic data storage
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Abstract
To compensate misregistrations between a detector array and a spatial light modulator in page-oriented volume holographic data storage, a method based on a three-pixel model is proposed against sub-pixel misalignment. Several methods for pixel mismatch compensation are reviewed. The quadratic two-pixel method is inapplicable when the local shift is negative or the size of the aperture is relatively small. The inter-pixel crosstalk model is revised and an improved three-pixel model is developed, which can be used to compensate arbitrarily misaligned data pages. The compensation method uses prior information of the pixels on the input spatial light modulator (SLM). Recursive solutions are carried out to recover the real values of the SLM pixels. Both simulation and experimental results show that the signal-to-noise ratio (SNR) can be doubled approximately by use of the compensation method based on the three-pixel model. The proposed method is appropriate for both positive and negative pixel shifts, and has similar effects of equalization, which effectively improves the SNR.
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Huarong Gu, Liangcai Cao, Qingsheng He, and Guofan Jin "Compensation for pixel mismatch based on a three-pixel model in volume holographic data storage", Proc. SPIE 7848, Holography, Diffractive Optics, and Applications IV, 78480X (17 November 2010); https://doi.org/10.1117/12.868997
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