How does the imreisze function works?

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John Doe 2020-5-18

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https://ww2.mathworks.cn/matlabcentral/answers/526315-how-does-the-imreisze-function-works

评论： John Doe 2020-5-18

Hello everyone. I was trying out the built-in hallway photo in MATLAB. I resized it by 1.5 times and 2 times than the original image. But somehow the 1.5 times version looks bigger to the naked eye? For low-res images, 1.5 times and 2 times resized images look their size though.

I was wondering if one could explain how the resize function is working here. Thanks!

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Answer 1

Image Analyst 2020-5-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/526315-how-does-the-imreisze-function-works#answer_433107

在 MATLAB Online 中打开

zoom_image.m

If the image cannot fit fully on the screen, it will reduce the axes control until it will fit comfortably. Maybe the 1.5 just barely fit but the 2 would not and it resized the 2 to be smaller than the 1.5. You can always turn on the tick marks to see the actual pixel count:

axis('on', 'image');

Also, see attached zooming example.