What is the meaning of interpolating of an image. How to interpolate

Hi, Upto my knowledge, I thought that interpolate is to find the intermediate value from 2 known values.

How to relate interpolation with images. What does it mean technically.

Regards, Siva

Answer 1

[Matt J]

In the case of images, it means to estimate an intermediate value between the neighbors of a given point. For example, in the case of bilinear interpolation (the default of MATLAB's interp2 routines), the 2x2 group of pixels around a point are averaged, e.g.

>> Image=[1 2; 3 4];

>> interp2(Image,1.5,1.5)

ans =

      2.5000