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tsbinz
on Oct 29, 2020
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Image Scaling Attacks
Opencv does use linear interpolation by default. What you'd need to do is to use something that helps against aliasing, for example first blurring the image with a kernel of the appropriate size or to use a scaling method like opencv's INTER_AREA.
steerablesafe
on Oct 29, 2020
[–]
What actually helps here is to use linear colorspace for downscaling and to correctly detect the source image's colorspace.
tsbinz
on Oct 29, 2020
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parent
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Colorspaces are an issue with scaling/averaging, but it's not what's happening here.
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