Comparator-based thresholding method for determining data values

Details Comparator-based thresholding method for determining data values Comparator-based thresholding method for determining data values

1996-12-26

1999-11-30

Rogers, Scott

Image analysis

Image enhancement or restoration

Variable threshold, gain, or slice level

382271, 382305, 341131, 341164, G06K 938

Patent

active

059956763

ABSTRACT:
Embodiments of the invention include a method and apparatus for determining values for data reproduced or retrieved from data storage media such as in holographic memory systems. The method includes initially approximating the value of data members retrieved initially from the data storage medium of interest (e.g., by their intensity levels based on an absolute scale), using those approximations collectively to establish one or more threshold levels for defining ranges for the data values to be determined, and determining values for the retrieved data members by comparing the initial data value approximations of the retrieved data members to the established threshold levels. Alternatively, the threshold level(s) are set initially and adjusted iteratively based on the initial approximations of the individual data members until a final established threshold level is established. Advantageously, embodiments of the invention reduce data encoding overhead by using data members to establish comparative threshold levels for the determination of their intended values.

REFERENCES:
patent: 4064484 (1977-12-01), Mese et al.
patent: 4084153 (1978-04-01), Otten
patent: 5450218 (1995-09-01), Heanue et al.
patent: 5455873 (1995-10-01), Cameron, Jr.
patent: 5510912 (1996-04-01), Blaum et al.

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