| 摘要 |
<p>Eight lattice-point data items of a unit cube are output from LUT memories (2Y, 2M, 2C) according to upper 3-bit signals of 3-dimensional color space signals input to an input system (G1). The magnitudes of the input 3-dimensional color space signals are compared in a comparison operating section (G5). The spatial coordinate position of an output value is determined based on the result of comparison by a spatial position determining section (G6) and one of the divided polyhedrons is selected by a divided polyhedron selecting section (G8). Further, whether or not a to-be-derived output value is present near the boundary surface of the divided polyhedron is determined based on the result of comparison of the comparison operating section (G5) by a boundary surface neighborhood determining section (G7). When it is determined that the to-be-output value lies near the boundary surface, lattice-point data items are corrected by data correction processing sections (3Y, 3M, 3C). Lattice-point data for the polyhedron selected by the divided polyhedron selecting section (G8) is selected from lattice-point data containing the corrected lattice-point data items by use of interpolation operation data selecting sections (9Y, 9M, 9C) and is subjected to the interpolation process by interpolation operation processing sections (4Y, 4M, 4C) to derive an output value. <IMAGE></p> |
