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How to extract velocity data from real footage

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Spencer Carpenter
How to extract velocity data from real footage
on Apr 1, 2014 at 12:52:29 pm

Hello,

I was wondering if there is a way to create a velocity map from footage.

I know you can create these in 3d apps but that's not what I'm looking for.

If you imagine that motion blur systems like RSMB calculate and track the change in the image and before they apply motion blur well I'm looking for something like that. Ideally I'd like to extract something like a greyscale matte where white equals lots of movement and black equals no movement.

Thanks for any help here

Spencer


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Walter Soyka
Re: How to extract velocity data from real footage
on Apr 1, 2014 at 3:43:23 pm

The developers of RSMB, RE:Vision Effects, has a plugin called "Motion Vectors: Create" which ships with Twixtor Pro.

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
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Spencer Carpenter
Re: How to extract velocity data from real footage
on Apr 1, 2014 at 4:01:27 pm

Thanks for the reply Walter, unfortunately I haven't got twixtor. Is there another to do it?


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Walter Soyka
Re: How to extract velocity data from real footage
on Apr 2, 2014 at 5:11:20 am

[Spencer Carpenter] "Thanks for the reply Walter, unfortunately I haven't got twixtor. Is there another to do it?"

Sorry, Twixtor Pro is the only Ae effect I'm aware of that can render motion vectors.

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events


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Chris Wright
Re: How to extract velocity data from real footage
on Apr 2, 2014 at 10:40:50 pm
Last Edited By Chris Wright on Apr 2, 2014 at 11:22:35 pm

"greyscale matte where white equals lots of movement and black equals no movement."

timewarp which comes with ae has a motion blur setting. just leave it at speed 100 for time and turn on shutter angle 2000. shutter samples makes it smoother. shutter angle makes it bigger.
then set as difference matte to original footage and add adjustment with a saturation -100. it should create a greyscale map of motion.


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