Need to do Down Sampling

Hello ....

 I want help in deleting odd rows and coloumns from an image and at the same time even rows and even coloumns from an image.

[Guillaume]

Your question is not clear. If you delete odd and even rows at the same time, then you're left with nothing.

Answer 1

[Guillaume]

This is very basic matrix indexing. To delete odd rows:

m(1:2:end, :) = []

To delete even columns:

m(:, 2:2:end) = []

Note that you can't do both at once. If you want to delete both odd rows and columns, you have to do it in two steps:

m(1:2:end, :) = []; %delete odd rows
m(:, 1:2:end) = []; %delete odd columns