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How to stretch an image by a factor along the horizontal axis?

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Peter
Peter on 18 Oct 2012
Hi everyone,
I'm trying to compensate for projection effects that happened during the off axis recording of an image. The result is an elliptic projection instead of a regular circle. So I'm looking for a way to stretch that image along the horizontal axis by a certain factor. How can this be done? Any advice is appreciated. Thanks.

Accepted Answer

Image Analyst
Image Analyst on 18 Oct 2012
Edited: Image Analyst on 18 Oct 2012
Sure, just send in a new XData property to imshow:
grayImage = imread('moon.tif');
[rows columns numberOfColorChannels] = size(grayImage);
subplot(2, 1, 1);
imshow(grayImage);
newWidth = [1 5 * columns]
subplot(2, 1, 2);
imshow(grayImage, 'XData', newWidth);
If you want to change the actual image itself, rather than just how it appears during display, then you can use imresize()
stretchedImage = imresize(grayImage, [rows newWidth]);
  1 Comment
Peter
Peter on 18 Oct 2012
Thanks. So easy once you know how to. Will never forget :)

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