[HN Gopher] What Is Rotoscope Animation? The Process Explained (...
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What Is Rotoscope Animation? The Process Explained (2020)
Author : walterbell
Score : 34 points
Date : 2024-08-06 17:16 UTC (4 days ago)
(HTM) web link (www.studiobinder.com)
(TXT) w3m dump (www.studiobinder.com)
| dang wrote:
| Related. Others?
|
| _Rotoscoped Animation of Filmed Parkour_ -
| https://news.ycombinator.com/item?id=12380112 - Aug 2016 (49
| comments)
| Lance_ET_Compte wrote:
| _Waking_Life_ from Richard Linklater in 2001.
| layer8 wrote:
| Already featured in the article.
| criddell wrote:
| Rotoscoping in _Prince of Persia_
|
| https://news.ycombinator.com/item?id=41068176
| hinkley wrote:
| It's a new take on what we called a camera lucida, which was a
| trick with optics that let you superimpose a scene over your view
| of a piece of paper. You could get the proportions right and then
| do your magic with color and technique. Not unlike how animators
| work.
|
| If you've seen anything on animation prior to computers you've
| seen the classic technique of putting one sheet of cello over the
| last thing you drew and flipping between them to copy the shared
| details before changing tone thing for the next frame.
| 082349872349872 wrote:
| There are several instances of matching motion in older Disney
| features; it seems likely that instead of rotoscoping 3rd
| generation animation off of 2nd etc. they're all 2nd gen
| rotoscopings off an internal 1st generation live action
| reference library.
| walterbell wrote:
| https://www.framefounder.com/unveiling-the-secrets-of-rotosc...
|
| _> Rotoscoping is the process of tracing over live-action
| footage frame-by-frame to create accurate and detailed mattes or
| masks.. ensuring a seamless blend between the foreground and
| background.. requires a keen eye for detail and patience, as it
| can be a time-consuming process.. Rotoscoping plays a crucial
| role in integrating visual effects seamlessly into live-action
| footage. Artists meticulously trace elements like explosions,
| fire, or magical effects to match the movements and perspectives
| of the scene. This process ensures the VFX elements appear
| natural and believably interact with the real-world elements._
|
| Feb 2024, https://arxiv.org/abs/2402.09883
|
| _> ..automatically synthetise retro-style 2D animations from
| videos. The method approaches the challenge mainly as an object
| segmentation and tracking problem. Video frames are processed
| with the Segment Anything Model (SAM) and the resulting masks are
| tracked through subsequent frames with DeAOT, a method of
| hierarchical propagation for semi-supervised video object
| segmentation. The geometry of the masks ' contours is simplified
| with the Douglas-Peucker algorithm. Finally, facial traits,
| pixelation and a basic shadow effect can be optionally added. The
| results show that the method exhibits an excellent temporal
| consistency and can correctly process videos with different poses
| and appearances, dynamic shots, partial shots and diverse
| backgrounds._
|
| Apr 2023, [SAM 1] "Segment Anything Model and the hard problems
| of computer vision", 52 comments,
| https://news.ycombinator.com/item?id=35558522
|
| Jul 2024, "SAM 2: Segment Anything in Images and Videos", 147
| comments, https://news.ycombinator.com/item?id=41104523
| KaiserPro wrote:
| One thing that they kind gloss over is that rotoscoping is used a
| lot in films to separate objects.
|
| For example, I did an exam on prince caspian
| (https://eu.southcoasttoday.com/story/entertainment/local/200...)
| to separate his hair from the forest. They didn't have green
| screen, and even if they did, it would obliterate his hair. (hair
| is translucent so glows green, and is removed by the software.)
|
| I failed the rotoscoping part, but passed the painting section
| (where you remove markers, crew or other features not wanted in
| the final image.)
|
| Whilst "a scanner darkly" is a brilliant example of rotoscoping,
| its not _the_ example. if you look at this showreel towards the
| end you see captain marvel,
| https://www.youtube.com/watch?v=_sYWzFNobEo look at her hair,
| every individual wisp of hair that extends past her neck is
| individually masked out.
|
| Good rotoscoping is often the building block of "expensive"
| looking VFX.
|
| For computer vision its also important so you can get ground
| truth on tracking various object and training models like segment
| anything
| CyberDildonics wrote:
| You are mixing up rotoscoping to do natural image matting with
| rotoscoping to paint over a frame. The original meaning was to
| match animation to a plate frame by frame as a sort of poor
| man's motion capture but that seems to be lost here.
| pazimzadeh wrote:
| that's how lightsaber effects were done in the original trilogy
| JoeDaDude wrote:
| Rotoscopeing in anime examples.
|
| Flowers of Evil https://www.youtube.com/watch?v=Toc9x19Cmkg
|
| Kaguya-sama Love is War scene:
| https://www.youtube.com/watch?v=Toc9x19Cmkg
| gaudat wrote:
| For your second example it's impossible to find a YouTube video
| of Chika dance that is available in every country. Try this:
| https://streamable.com/0hrdh
|
| It's remarkable how smooth the animation is. And how natural
| the character's movements are. This scene jumps over the
| uncanny valley straight into being enjoyable.
|
| And I think there's an AI paper from a Chinese researcher using
| this video as a demo.
| o11c wrote:
| Second link is the same as the first.
| gumby wrote:
| The wikipedia entry on rotoscoping explains the process more
| compactly and succinctly.
| https://en.wikipedia.org/wiki/Rotoscoping
| siamese_puff wrote:
| A cool Keanu Reeves film employs this in A Scanner Darkly.
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