Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2005-03-29
2005-03-29
Tokar, Michael (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S166000
Reexamination Certificate
active
06873282
ABSTRACT:
Differential measurements allow correction of fixed-pattern noise errors in digital imaging arrays which use time-to-threshold A/D conversion techniques. Two time-to-threshold measurements are made with the same sensor and threshold-detecting circuitry. The measurements are made in quick succession so that the amount of incident energy is substantially unchanged. However, the two measurements use differing initial sensor output levels or threshold levels. The difference between the two measurements then reflects the time required for each sensor output signal to change by an amount equal to the difference between the initial sensor output values or the threshold values. Repeatable noise terms are cancelled in the computed difference measurement.
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Nguyen Linh V
Tokar Michael
LandOfFree
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