Is it okay if I label my images with their original size and then resize them, or should I first resize them and then label them?

I mean do I need to recalibrate my labels if I resized my images?

  • 1
    $\begingroup$ If resizing does not change the contents of the images, then you probably can first label them and later resize them. However, resizing can actually change the $x$ and $y$ dimensions differently and make certain objects look different (e.g. stretched) and maybe no more really recognizable. I would say that if resizing changes both dimensions by the same amount, then it should be safe to label the images first, but, to be honest, I have never really studied this issue seriously. $\endgroup$
    – nbro
    Commented Aug 6, 2020 at 11:26
  • $\begingroup$ @nbro Thanks for the response, I will consider that. $\endgroup$ Commented Aug 6, 2020 at 13:28
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    $\begingroup$ your labels are related to x,y positions into the image? if yes, you must change the x,y in labels by the same factor you use on resize your photo. $\endgroup$ Commented Aug 6, 2020 at 14:42
  • $\begingroup$ @AliKHalili In my comment above, I assumed you're doing image classification. However, as Rogelio wrote above, it's true that, if you're trying to solve a task like image segmentation (i.e. dense classification), then you'll probably need to change the labels after resizing. $\endgroup$
    – nbro
    Commented Aug 6, 2020 at 16:53


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