Quarter of an image.

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Ferdows Dolon
Ferdows Dolon 2014-9-13
回答： Image Analyst 2014-9-13
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.

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Image Analyst
Image Analyst 2014-9-13
Try this on your input matrix m:
quarterMatrix = m(2 : 2 : end, 2 : 2 : end);

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Youssef Khmou
Youssef Khmou 2014-9-13
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,:);

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