3D Resolution

[PaulClements]

Hi all,

I was wondering, with 3D do you get the resolution of a single camera or both cameras combined. In other words, using the 3K scarlet would that give you 3K in 3D or a perceived 6K since both eyes would be receiving 3K. If yes it gives 6K would this then be a usable resolution for Imax3D?

Thanks
Paul

Edit: Normal Digital Imax uses 2 x 2K projectors if I remember right? for 3D do they simply use one projector per eye or do they have a second bank of 2 projectors?

[Joseph Ward]

Hi all,

I was wondering, with 3D do you get the resolution of a single camera or both cameras combined. In other words, using the 3K scarlet would that give you 3K in 3D or a perceived 6K since both eyes would be receiving 3K. If yes it gives 6K would this then be a usable resolution for Imax3D?

Resolution goes down like compression. So 3K or lower would be more accurate than 6K.

Edit: Normal Digital Imax uses 2 x 2K projectors if I remember right? for 3D do they simply use one projector per eye or do they have a second bank of 2 projectors?

Usually one 2K Projector with triple flash RealD, now offering for Sony 4K Projector.

[Michael Lindsay]

Hi Paul

It depends on the display technology.. for example polarised 2 projector systems (with perfect alignment and suitable content) really have added resolution. Obviously simple anaglyph has no added resolution.

regards

Michael L

[Mark L. Pederson]

Hi Paul

It depends on the display technology.. for example polarised 2 projector systems (with perfect alignment and suitable content) really have added resolution. Obviously simple anaglyph has no added resolution.

regards

Michael L

It does really depend on the display and the signal driving the display.

Line-by-line displays and DLP "mesh" displays are using 50% of the left eye and 50% of the right eye. So ... for example 24 fps - 50% of left eye, 50% of right eye = 100% of resolution.

But in some cases - a 3D display may be using a SINGLE HD signal that has the left eye and right eye "squeezed" into "side by side" mode - in this case - you are looking as 50% of the horizontal resolution. And it shows. (there is also a "over/under" mode - and in that case you get 100% horizontal and 50% of verticle = slightly better)


You can play a 3D DCP at 48fps and get full resolution for every frame - so you are actually watching TWICE as many pixels per second. Same goes for shuttle glasses systems (like Nvidia's tech) that use 120 hz displays.

One should also not that the current "norm" for DCPs is 250 Mbits/sec - so ... in 3D DCPs that is "split" between L and R eyes - which means half the data rate (more compression) than 2D PER FRAME - but same data per second.

One should also note that RED RAY looks amazing at 10 Mbits/sec. So ... watch for 4K 3D via Red Ray at a quality to surpass current industry standards.

[PaulClements]

... watch for 4K 3D via Red Ray at a quality to surpass current industry standards.

Any insight as to what we might watch it on? :)

Paul

[Warren Kommers]

I've done a few 3D projects and although it may not be technically correct both Anaglyph and Polarized APPEAR to double the resolution in my experience. I had two noisy 1080p images in anaglyph that were significantly less noisy when together. At least to the eye. In the polarized world it was much harder for me to tell the difference between RED 2k and 4k if a deep f stop was used that didn't give it away by DOF.

[Mark L. Pederson]

Any insight as to what we might watch it on? :)

Paul

I don't really have any actual "insight" as I don't have a Red Ray .... YET. And one would assume specs are changing by the day at this point.

But what COULD happen is the following -

If it's wavelet based (don't know that for sure) - the same 4K 48fps 3D Red Ray file could (depending on hardware fire-power) play out like this:

(a) a 2K stream - 48fps - same as current DCP servers - to drive existing 2K projectors with current 3D tech


(b) TWO separate streams of 24fps 2K - driving dual projector set-ups (over/under)

(c) a 4K single stream into next-gen 4K projector

(d) TWO streams of 4K 24fps for dual 4K projectors(over/under) or next-gen 4K projector

It's also conceivable to do a 24 fps 4K Red Ray stream of left eye/right ("side-by-side mode") (each eye being 2K horizontal resolution)

I would suspect that a new 4K projector based on the new TI chip will just run at 48fps - and you could do REAL D or DOLBY tech. That would be most logical. Who knows ... maybe some new RED tech as well.

Ideally, Red Ray will pay media to existing projectors and devices as well as next-gen, forth-coming goodies.

[Pedro Guimaraes]

I've done a few 3D projects and although it may not be technically correct both Anaglyph and Polarized APPEAR to double the resolution in my experience. I had two noisy 1080p images in anaglyph that were significantly less noisy when together.

Don't confuse resolution with image "noise"

Since image noise is random, each eye is looking a a random pattern of image noise they tend to cancel themselves out.

So yes, in every case where you have "noisy" images, when viewing in 3D your brain combines them to make the images with apparently very reduced noise from original.

Which is great news for us digital 3D shooters, shooting 3D with a AVCHD camera in low light I have ended up with extremly clean images in 3D.

In my experience even when watching phantom65(4K) 3D footage filmed out to IMAX theater never have I have the impression of increased perceptual resolution as the original poster question implies.

So to me the answer is no.......

if you shoot a resolution chart and each camera resolves lines .....say to 3k. (like the red does)

if you watch the same footage in 3D you won't magically see the 4k lines on the chart resolve.

Like I said it will help mask some imperfections like noise and possibly bad focus in one eye.

just my .02 cents

[Warren Kommers]

Don't confuse resolution with image "noise"

I'm not. They are different but in this case it is a useful example of how the appearance of more resolution occurs in 3D.

[istvanttt]

I've done a few 3D projects and although it may not be technically correct both Anaglyph and Polarized APPEAR to double the resolution in my experience. I had two noisy 1080p images in anaglyph that were significantly less noisy when together. At least to the eye. In the polarized world it was much harder for me to tell the difference between RED 2k and 4k if a deep f stop was used that didn't give it away by DOF.

I agree with you. Even if the "counted" resolution doesn't rise we get more visual information to the screen specialy if 2 projector systems are used.