CODEWITHSUNDEEP
matlabresizecompression
Hoda Fakharzadeh
Hoda Fakharzadeh

Reputation: 11

making an image half of it's size in Matlab without using Resize

that's a code my prof said but I don't understand it. A=imread('cameraman'); i=1:4:256; T=A(i,i); imshow(A); figure; imshow(T);

Why does the image just become smaller, and details are not omitted?

Upvotes: 0

Views: 379

Answers (1)

Setsu
Setsu

Reputation: 1228

Details are being omitted. I'm assuming from the code that the image is 256x256. The indexing variable i is being defined with a step of 4, meaning it goes something like this:

i = [1 5 9 13 ... 256];

Then, it is used to index both the row and columns of the matrix A to create a new matrix T. That's why the new image is smaller; T only contains data points from A that are indexed by i.

As an exercise I recommend varying the step to see how the resulting image changes. Change the step to 1 and you will see that both images are the same size. Change the step to 8 and you will see that the second image is now even smaller than before.

Upvotes: 2

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