| 摘要 |
PROBLEM TO BE SOLVED: To provide an address generation circuit and method and its program for generating an address for a lookup table whose scale is optimal within the allowable error range of color conversion and a lookup table preparation circuit and method and a color conversion device using these and an application device using the color conversion device. SOLUTION: An RGB signal whose color components are 12 bits is divided into 11 by a quantization circuit 11, and the 4 bits of an integer part are outputted as a quantized value, and the multiplied value of a G quantized value and an offset valueΔ1 by a multiplying means 14 is subtracted from the connected value of R, G quantized values by a subtraction means 15, and the multiplied value of a B quantized value and an offset valueΔ2 by a multiplying means 17 is subtracted from the connected value of the subtracted value and the B quantized value by a subtraction means 18, so that continuous addresses are generated. Then, a color conversion output is obtained by performing an interpolation arithmetic operation based on the color output value of the lookup table corresponding to the continuous addresses and the quantization error. COPYRIGHT: (C)2004,JPO&NCIPI
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