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Re: Skintones - Are They Affected at the Sensor Level? And Motion Cadence Question

Re: Skintones - Are They Affected at the Sensor Level? And Motion Cadence Question

Adam Wilt

But isn’t the fade in/fade out lost when the frame is recorded or presented on a video display. 

No, the shaped exposure window attenuates high-frequency aliases during capture, before they are inextricably embedded in the captured image. Tessive images were clearly smoother than “normal” electronic-shuttered images even on the coarse and primitive LCD displays of that long-distant era (2011, grin).

I’m embedding an image in my email and with any luck it’ll appear; if not, it’s towards the bottom of the page at Cine Gear Expo LA 2011 by Adam Wilt - ProVideo Coalition

Using a Gaussian sampling window as the Time Filter did works in the temporal domain just like Gaussian sampling in the spatial domain. Put “gaussian sampling to reduce aliasing” into your favorite search engine and you’ll get enough results to keep you busy for hours.

There’s a whole bunch of artifacts possible depending on the presentation technology (don’t get me started on DLP artifacts during eye saccades) but these are in addition to temporal capture artifacts. Once you’ve captured the spinning wagon wheel spinning backwards, you’re stuck with it.

It is still I availableI think as RealD TrueMotion

That’s a different way of skinning the same cat: TrueMotion (formerly Tessive Time Shaper) uses a 360º shutter and high-frame-rate (120fps+) capture to record a scene, and then lets you selectively pull groups of frames from that stream to synthesize lower frame rates (e.g., 24fps) with “shutter angles” determined in post by combining more or fewer source frames into each output frame, dimming the leading & trailing source frame(s) as needed to “shape” the synthetic shutter window. I saw a demo (I think by Jim DeFilippis) at the Tech Retreat a few years ago: it worked better than it had any right to, disgustingly well given how “coarse” the source sampling was. 

Mind you, you do need an HFR-capable camera and plenty of light, and the storage requirements are scandalous!

Adam Wilt
technical services: consulting / coding / camerawork
Vancouver WA USA (no, not that Vancouver, the other one)

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