Data conversion apparatus and data conversion method

A data conversion method for converting converted data that belongs to a three-axis data space, comprising:

• storing correction data at respective lattice points of a 3D lookup table, in which each of x, y, and z-axes that correspond to three axes is divided into two or more lattice points, and the correction data for correcting the converted data in correspondence to input values of the converted data is provided for the respective lattice points obtained from the respective lattice type axes, in a first to an eighth memory;
• and
• reading the correction data of the lattice points positioned around the converted data from the first to eighth memories with reference to the 3D lookup table, and converting the converted data based on the read correction data;
• wherein the storing of the correction data for the respective lattice points of the 3D lookup table in the first to eighth memories includes
• assuming a virtual 3D lookup table, which has an axis in which one virtual lattice point is included on the side of an end portion of the axis, in which the number of the lattice points is an odd number, and the number of lattice points is an even number among the respective axes, a lattice type axis that is different from the axis that includes the virtual lattice points, and the virtual lattice points and lattice points except for the virtual lattice points, in the 3D lookup table in which any one of the x, y, and z-axes is an axis in which the number of lattice points is an odd number, and then allocating data to the virtual lattice points;
• and
• storing the data at the respective virtual lattice points and the correction data at the lattice points except for the virtual lattice points in the virtual 3D lookup table in the first to eighth memories.