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2012: https://www.instantfundas.com/2012/10/how-to-unblur-out-of-focus-and-blurred.html https://www.instantfundas.com/2012/10/how-to-unblur-out-of-f... 2017: h
by thdrdt 6y ago
2012: https://www.instantfundas.com/2012/10/how-to-unblur-out-of-focus-and-blurred.html https://www.instantfundas.com/2012/10/how-to-unblur-out-of-f...
2017: https://arxiv.org/pdf/1702.00783.pdf https://arxiv.org/pdf/1702.00783.pdf (Pixel Recursive Super Resolution)
2020: https://venturebeat.com/2020/01/22/researchers-use-ai-to-deblur-human-faces-in-photos/ https://venturebeat.com/2020/01/22/researchers-use-ai-to-deb...
Edit: Most face recognition software works by down-sizing and blurring an image to faster detect face features. So in theory it is very easy to detect face features from a blurred image. A deblur tool can then use this information to better deblur a face.
- dunefox 6y agoYes, that works if the face itself is blurred, not if random noise is used in place of the face.
- laughinghan 6y agoThey're not using random noise in place of the face, they're using a 25px Gaussian blur: https://news.ycombinator.com/item?id=23415600 https://news.ycombinator.com/item?id=23415600
- dunefox 6y agoNice find. That is unfortunate then. I thought they'd make more effort.
- ulfw 6y agoImpressive examples. Thanks for posting them! So the ridiculous „Enhance!“ one sees in TV show crime dramas could one day actually become true.
- throwaway0a5e 6y agoYou can't make data that isn't there. It's fundamentally going to be a guess. You can enhance your way to a face or a license plate but there is zero guarantee it will be the face or the license plate that the low quality image/video is of. This is why solid blocks of color or emojis are so effective at censoring images, it takes the data and replaces it with pure junk.
- regularfry 6y agoIf you know it's a gaussian blur with a known radius, you can uniquely reverse it.
- wizzwizz4 6y agoYou do, however, lose colour depth information (e.g. deep color to true colour, true colour to high colour / 256 colours). Still enough to detect a face.
- chooseaname 6y agoBut is deblurring from handshake or lens out of focus or even a Gaussian blur the same as some random gradient blur they seem to be using? Edit: The images in the Signal article don't look like images of blurred faces. They look like blurry images overlaid onto faces. If you don't blur the face, how can it be unblurred?
- laughinghan 6y agoYes, they are using a 25px Gaussian blur, they are not overlaying a different image on top: https://news.ycombinator.com/item?id=23415600 https://news.ycombinator.com/item?id=23415600