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Using STMaps to Undistort and Redistort in AE

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Antony Dupsta
Using STMaps to Undistort and Redistort in AE
on Jan 7, 2020 at 3:15:25 am

Using provided STMaps to undistort and Redistort in AE.

Anyone have any luck with STMaps in AE. Specifically: to Undistort plate--> Solve camera--> generate STMap send to Compositor--> 2D applies inverse distortion Via RE_Map using the provided STMap in AE. Results show pixel stretching on the edges.

Take the STMap the Match move software or tracking dept generated.
Use RE_Map to reintroduce the exact distortion while using their STMap in comp.
This causes edge pixels of plate and 3D elements to stretch on the edges of frame.

I believe PFBarrel helped translate this in AE and that was discontinued, since them this process has been broken with AE compositors.
Plenty of Work arounds if you are a one man show, but if you are using match move cameras from other depatments, passing comps from vendor to vendor, I would be interested in a proper STMap workflow in AE.
Thoughts?


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Richard Garabedain
Re: Using STMaps to Undistort and Redistort in AE
on Jan 7, 2020 at 4:35:40 pm

I would like to know what you are talking about...so i googled stmaps and found nothing...so what is this?


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Martin Brennand
Re: Using STMaps to Undistort and Redistort in AE
on Jan 7, 2020 at 11:53:10 pm

Richard,
STMaps are colour fielded maps like UV maps that are used to map and generate lens distortion. They are common in compositors like Nuke or Fusion and are often created by programs like Mocha and other tracking/paint software.

Martin Brennand | Product Manager | Mocha - Boris FX (Imagineer Systems)


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Walter Soyka
Re: Using STMaps to Undistort and Redistort in AE
on Jan 8, 2020 at 2:19:29 pm

Antony, I'm sorry but I don't clearly understand the problem that you're seeing.

If you're working at 8bpc, you'll definitely see artifacts in RE:Map. You have to work at 16bpc or 32bpc.

If you're losing data at the edges, perhaps you need to do your intermediate work at the distortion-corrected frame size (which should be larger than the original/destination).

Can you post a sample undistort/re-distort ST-map you're looking to work with?

Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive [twitter]   |   RenderBreak [blog]   |   Profile [LinkedIn]


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