分别利用 Lagrange插值法、分段线性插值法与三次样条法进行插值逼近-Respectively, by Lagrange interpolation, piecewise linear interpolation and cubic spline interpolation approximation method

Chapter 3 of text book “Digital Image Processing” Gonzales named Intensity Transformations and Spatial Filtering, which consists of 6 sub-sections including (1) Basics intensity transformation functions, (2) Histogram Processing, (3) Spatial Filterin