Quarter of an image.

Hi everyone, I am stuck with this problem. I need to Write a Matlab function that will drop every second even number pixel. Row-wise: you retain one pixel, and then you drop the next pixel, until you reach the end of that row. Column-wise: you retain one pixel, and you drop the next pixel, until you reach the end of that column. The image should therefore be a quarter of its original size.

Thank you very much. regards.

Answer 1

[Image Analyst]

Try this on your input matrix m:

quarterMatrix = m(2 : 2 : end, 2 : 2 : end);

Answer 2

[Youssef Khmou]

Using vector function,the problem becomes simple, here is an example to select 1/4 of matrix :

     N=400;
     H=randn(N);
     line=1:2:N;
     V=H(:,line);
     Final=V(line,:);