MATLAB 绘制插值图像

既然是图像就用下个
其中， 'cubic' - bicubic interpolation
这个选项就是你所要的
如果是图形就用
interp1

INTERP2 2-D interpolation (table lookup).
ZI = INTERP2(X,Y,Z,XI,YI) interpolates to find ZI, the values of the
underlying 2-D function Z at the points in matrices XI and YI.
Matrices X and Y specify the points at which the data Z is given.
Out of range values are returned as NaN.

XI can be a row vector, in which case it specifies a matrix with
constant columns. Similarly, YI can be a column vector and it
specifies a matrix with constant rows.

ZI = INTERP2(Z,XI,YI) assumes X=1:N and Y=1:M where [M,N]=SIZE(Z).
ZI = INTERP2(Z,NTIMES) expands Z by interleaving interpolates between
every element, working recursively for NTIMES. INTERP2(Z) is the
same as INTERP2(Z,1).

ZI = INTERP2(...,'method') specifies alternate methods. The defaul