. "However, any index including and coming after k+1 is not used and is not meaningful. [0243] Further, using FIG. 5(b), a description is given of the pre-insertion sub-pixel number M and post-insertion sub-pixel number N. [0244] For example, (x, y)=(9, 3) and len=2, M=3, len=2, N=4, m=3, and SX=2 are derived by the processing in FIG. 4." . . .