Table 1: Comparison of proposed 4-point scheme with other 4-point schemes.

Scheme Type Approximation order Support

Binary 4-point [5] Interpolating 4 6 1
Binary 4-point [6] Interpolating 4 6 1
Binary 4-point [7] Approximating 4 7 2
Ternary 4-point [4] Interpolating 3 5 2
Ternary 4-point [8] Interpolating 3 5 2
Ternary 4-point [9] Approximating 4 5.5 2

Proposed scheme Approximating 5 5 3