Image analysis – Color image processing
Patent
1997-05-12
1998-06-16
Stoll, Thomas L.
Image analysis
Color image processing
358523, 358525, 358518, 395131, G03F 308
Patent
active
057684103
ABSTRACT:
A color signal processing apparatus which is capable of providing satisfactory operation accuracy while keeping the memory size relatively small. A dividing circuit divides three input signals R, G, and B into upper bit data and lower bit data. A first table memory stores output values for all combinations of the three upper bit signals, the upper bit data of the three input signals being accepted as address signals and a first output value being provided. A second table memory stores the output values for all combinations of signal values obtained by adding a prescribed offset (e.g. 2.sup.NL /2) to a signal value which is expressed by upper bits, upper bit data of the three input signals being accepted as address signals and a second output value being provided. An interpolation circuit outputs a final output signal in accordance with the output value of the first table memory, the output value of the second table memory and the lower bit data.
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Ohta Ken-ichi
Yabe Takashi
Canon Kabushiki Kaisha
Stoll Thomas L.
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