| 摘要 |
PURPOSE:To perform natural color correction with respect to a hue signal, by a method wherein the hue signal is detected from a color image signal to be converted to a function on the basis of a hue signal conversion table, and the hue of the max. value and the complementary color of the min. value are multiplied by a correction coefficient while predetermined operation is applied to the function data to output a color image signal. CONSTITUTION:Color image signals Y, M, C are inputted and a comparator 1 outputs not only the max. value signals as color signals DAY, DAM, DAC but also the complementary colors of the min. values as color signals DAB, DAG, DAR. The color signals are inputted to correction devices and multiplied by a correction coefficient at every color to output a coefficient signal DAA while the latter color signals are inputted to correction devices to output a coefficient signal DBB and both signals DAA, DBB are inputted to multipliers 5A, 5B. The comparator 1 outputs binary signals D1-D3 to input the same to an operator 3 and the differences between the binary signals D2, D1, D3 are calculated by subtractors 31, 32 to calculate hue signals H1, H2 which are, in turn, inputted to hue signal conversion tables 4A, 4B. The hue signals H1, H2 are calculated on the basis of function values to be inputted to the multipliers 5A, 5B. The coefficient signals DAA, DBB are multiplied by the hue signals H1, H2 to obtain coefficient hue signals MP1, MP2 which are, in turn, inputted to an adder 6 to output an added color corrected color image signal Y. |
