Monotone Data Visualization Using Rational Trigonometric Spline Interpolation

Figure 6

𝐶¹ monotone rational trigonometric bicubic function with 𝛼_𝑖,𝑗=12,  𝛿_𝑖,𝑗=12, 𝛼_𝑖,𝑗+1=14,  𝛿_𝑖,𝑗+1=13,  𝛼_𝑖,𝑗=12,  𝛿_𝑖,𝑗=12,  𝛼_𝑖+1,𝑗=15, 𝛿_𝑖+1,𝑗=13.