1 August 2010 Tolerance for translation disturbances of template-matching two-dimensional modulation code for holographic memories
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Abstract
The decoding performance of the 4/9 code, which depends on the accuracies of similarity comparisons for the code and the positional marker, was computationally evaluated in response to translation disturbances. The reproduction bright spot size () was constrained to be smaller than the image-sensor pixel pitch (p) for the code, and >p was necessary for the marker. These contradictory requirements were solved by a reproduction method in which a large numerical aperture (NA) was set for the code and a small NA was set for the marker. A bit error rate of 10−4 and a position detection resolution of ~p/10 were confirmed in the read-only-type holographic memory where the above method using two different NAs was applied.
© (2010) Society of Photo-Optical Instrumentation Engineers (SPIE)
Masakatsu Senda, "Tolerance for translation disturbances of template-matching two-dimensional modulation code for holographic memories," Optical Engineering 49(8), 085803 (1 August 2010). https://doi.org/10.1117/1.3481103 . Submission:
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