Apparatus and method of mapping look-up table in an imaging system
AssigneeUmax Data Systems Inc.
InventorChui-Kuei Chiu
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Abstract
The present invention provides a mapping method and apparatus of look-up table in an imaging system. The mapping method implemented by the apparatus comprises receiving a digital signal having a high-bit portion and a low-bit portion. The high-bit portion of the digital signal is subjected to a curve table for look-up mapping to get a high-bit signal. The partial high-bit portion is subjected to a slope table for getting a factor. The low-bit portion of the digital signal is calculated with the factor to get a low-bit signal. The high-bit signal is combined with the low-bit signal to get an output signal. The curve table and slope curve can reduce the memory usage of the imaging system.
Claims19
A method of look-up table in an imaging system, said method comprising:
- receiving a digital signal having a high-bit portion and a low-bit portion;
- subjecting said high-bit portion of said digital signal to a curve table for look-up mapping to get a high-bit signal;
- subjecting partial said high-bit portion to a slope table for getting a factor;
- calculating said low-bit portion of said digital signal with said factor to get a low-bit signal;
- and
- combining said high-bit signal with said low-bit signal to get an output signal.
Apparatus of mapping look-up table for reducing memory usage of an imaging system, said apparatus comprising:
- high-bit mapping means response to a digital signal for receiving and mapping a high-bit portion of said digital signal to output a high-bit signal;
- low-bit calculation means response to said digital signal for receiving and calculating a low-bit portion of said digital signal to output a low-bit signal;
- and
- combination means for combining said high-bit signal with said low-bit signal to output an output signal for a controller.
A storage device used in an imaging system, said storage device responsible for mapping look-up table and enabling to execute following steps:
- receiving a digital signal having a high-bit portion and a low-bit portion;
- subjecting said high-bit portion of said digital signal to a curve table for look-up mapping to output a high-bit signal;
- subjecting partial said high-bit portion to a slope table for outputting a factor;
- calculating said low-bit portion of said digital signal with said factor to output a low-bit signal;
- and
- combining said high-bit signal with said low-bit signal to output an output signal.
Dependencies are inferred from the claim text.