Embed vector field in bigger array

In order to undistort an image for a special purpose, I used displacement vectors.

The vector field isn't covering the entire image. Problem is the following: To apply the vectors on the image the sizes need to be identical.

Vector field: 2000x1200

Image: 6000 x 4000

Is there a way to embed the vector field in a bigger array, so that it can be applied correctly to the image. Maybe it could be embedded in a matrix of 0?

The region of interest is only the 2000x1200 field. Extrapolating the vector field to 6000x4000 doesn't deliver the desired result, neither croping the image to 2000x1200.

Answer 1

[KSSV]

Read about padarray.

Other option:

A = rand(4) ; 
B = zeros(10) ; 
B(3:6,3:6) = A

B = 10×10

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.1004 0.8599 0.4755 0.6533 0 0 0 0 0 0 0.5186 0.1796 0.7476 0.6220 0 0 0 0 0 0 0.9443 0.5652 0.8298 0.7524 0 0 0 0 0 0 0.2921 0.0010 0.6162 0.0293 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0