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citnaj's profile
Jason Antic
Jason Antic
Jason Antic
@citnaj

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Jason Antic

@citnaj

Obsessively pursuing the perfection of image and video colorization/restoration using deep learning. Creator of DeOldify.

Ocean Beach, San Diego
deoldify.ai
Joined January 2010

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    1. Jason Antic‏ @citnaj Jan 12
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      Here's another round of colorizations using my latest unreleased DeOldify model. Photos are again from Reddit's r/TheWayWeWere (great source!)pic.twitter.com/bKwZsXVYTO

      43 replies 121 retweets 870 likes
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    2. Rory Mitchell‏ @rorycmitchell Jan 12
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      Replying to @citnaj

      Can you give us a general lay persons explanation of how this works? Through reading through comments I'm guessing it basically recognizes identifies objects in the picture and compares it to existing database of color photos? Or "something" ? 🤔

      1 reply 0 retweets 1 like
    3. Jason Antic‏ @citnaj Jan 12
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      Replying to @rorycmitchell

      1/ That's part of it- It has one end that is a resnet image recognizer that picks out what's in the scene. The other half constructs a new image based on that information. I'd say a significant percent of colors chosen are based more on "optics rules" it seems to be learning.

      2 replies 0 retweets 5 likes
    4. Jason Antic‏ @citnaj Jan 12
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      Replying to @citnaj

      2/ So those optics rules would be things like how light reflects off glass and other objects, etc. This is more speculation on my part at this point but it would explain a lot of how it's very consistent in what it learns, and how it can fill in all these gaps of data.

      1 reply 0 retweets 1 like
    5. Jason Antic‏ @citnaj Jan 12
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      Replying to @citnaj

      3/ Because clearly I can't provide it with all the information about all coffee cans, articles of clothing, random knick-knacks and one off pieces of art, etc. Yet it still manages to figure out sensible colors (mostly).

      1 reply 0 retweets 2 likes
    6. Pierre Ouannes‏ @PierreOuannes Jan 12
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      Replying to @citnaj

      That's very interesting insight Jason, thanks for sharing! I'm wondering whether there could be a way to share physics with the model, because we know the optic rules it learns. Would there be a way to give the model general insights about how light works? (1/2)

      1 reply 0 retweets 1 like
    7. Pierre Ouannes‏ @PierreOuannes Jan 12
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      Replying to @PierreOuannes @citnaj

      I'm guessing that the answer is no given that DL is such a black box, but I'm curious to have your take on it. (2/2)

      1 reply 0 retweets 1 like
    8. Jason Antic‏ @citnaj Jan 12
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      Replying to @PierreOuannes

      1/ Well actually have had a similar line of thinking in that I believe building in a semantic embedding layer much like what was done in the DeVise paper years ago might help quite a bit. https://static.googleusercontent.com/media/research.google.com/en//pubs/archive/41473.pdf …

      1 reply 0 retweets 2 likes
    9. Jason Antic‏ @citnaj Jan 12
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      Replying to @citnaj @PierreOuannes

      2/ Now that would be semantic information like "this thing is usually red" and combined with "this thing that you've never actually seen has this part and this part that you do know so it's most likely this thing".

      1 reply 0 retweets 1 like
      Jason Antic‏ @citnaj Jan 12
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      Replying to @citnaj @PierreOuannes

      3/ But I think you could maybe capture optics rules of thumb into that same embedding space too (maybe...?). Same basic line of thinking though. Dislcaimer: This is all speculation at this point and there's a good chance I'm wildly off base here.

      3:07 PM - 12 Jan 2020
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        2. Pierre Ouannes‏ @PierreOuannes Jan 12
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          Replying to @citnaj

          Interesting, I'll take a look a that paper. So this would be learned I'm guessing, not hard-coded? And if it's hard coded, how would you go about it?

          1 reply 0 retweets 0 likes
        3. Jason Antic‏ @citnaj Jan 12
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          Replying to @PierreOuannes

          Correct it'd be learned. As far as papers go that DeVise one is awesome and pretty mind blowing when you implement it yourself. Jeremy actually went over this in FastAI's part 2 of version 2.

          1 reply 0 retweets 1 like
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