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Questions on '3d' imaging

post #1 of 7
Thread Starter 
Hello, it's my understanding that any device can display a "passive 3d" image and that the new top of the line projectors are using twin projection systems in one to create a better "passive 3d" image.

One of the things I'm wondering is will a '3d' projector display a better '3d' image of a passive variety compared to an equal '2d' projector model.

Also is the '3d' projector able to take a passive signal and use it's active technology and glasses to produce a more life like '3d'.

Furthermore is a '3d' projector able to up convert any image to '3d' be it passive or active from 2d or '3d passive' source?(I don't think so but just covering all the bases)

Thank you for your time and input.
post #2 of 7
First you should post in the 3D tech forum for these questions. Your confused about the difference between active and passive. The source is the same for both displays (media containing the left and right image). The display is what is different. Two 2D projectors can display a 3D picture( one for left one for right). As for 2D to 3D conversion some projectors have it some don't, some BR players have it and there are stand alone 2D to 3d converters
post #3 of 7
Thread Starter 
Oh I must be then as I was under the impression that there were multiple ways to create a '3d' image one by rendering two images together be it a left and right "eye" view and then producing different wavelengths for each eye (ie horizontal and verticle or red and green images ect) then the viewer would wear specialized glasses in the wavelength of the respective views.

The other way (active) that I know of uses completely separate images one at a time which alternate (refresh) at generally 120hz while the active glasses are synced with the image frequency and limit viewing through one eye or the other at the same frequency (thus called shutter glasses)

But I may be mistaken as I am not big into "3d" I prefer reality view/vision lol.

Sorry about this forum didn't realize there was a 3d specific one.
post #4 of 7
There are multiple ways to get 3D video. SBS (side by side), TnB (top and bottom), checkerboard, blu ray frame packing. But there isn't an active vs passive signal. If there were, then you'd have to buy different blu ray discs depending on the display type.

"One of the things I'm wondering is will a '3d' projector display a better '3d' image of a passive variety compared to an equal '2d' projector model."

Not quite sure what you're asking but a 2D projector model cannot display 3D so yes the 3D projector will display a better 3D image.

When talking about projectors, unless you're going to spend gobs of money you will be looking at active systems. A passive system requires 2 projectors, a silver screen to maintain the polarization, and some way to split the video signal (like getting 2 optoma 3D XL boxes). You're looking at an expensive premium that would cost probably 4X the cost of an active system.

I have been reading about the Tru3D system, they have a polarizer that converts a projector from active to passive 3D. It costs 1500 by itself, plus you still need a silver screen to maintain polarity.
post #5 of 7
Thread Starter 
Well they can't use the same signal unless they are rendered with two images as in the first explanation depicting different wavelengths and the active player then reads this information and separates the images were as the passive system would not. I have always just assumed they were generated and rendered differently such that some times you buy a '3d' movie and it will come with passive lenses in the box to be played with any device even an old crt TV and sometimes you buy a DVD which does not include glasses and requires a '3d' device with an active system.
post #6 of 7
Thread Starter 
See you may be right (and ofcourse I'm not trying to argue or disagree with you) all so called '3d' movies may just use the wavelength format (if you will) and some DVDs just might not come with the glasses (in which case the reader or display device may interpret this signal and convert it into an active signal for the shutter system) however this would still negate the need for "3d" ready hardware as we have never needed this equipment in the past (ofcourse that fact wouldn't prevent companies from inventing and marketing new technology but that's another discussion).

I have heard and agree that a passive system is much more comfortable and natural to watch not to mention less straining (although you cannot tell I still believe there to be a minor effect). So I cannot see the reason for an active system unless there were different rendering technologies; cinemas still use by majority a standard 1920X1080 LCD projector and use the passive wavelength format.

I hope you fallow...I do allot of analog and digital video editing and can myself create '3d' footage in the wavelength format (anamorphic I believe it is called but I may be mistaken) although I have never (nor my clients) had the need to work with or create this type of footage before.
post #7 of 7
The 3D movies that come with glasses in the box are anaglyph and can be used with any type of display. They can be red/blue or cyan/magenta, (I think there may be other options). Honestly these movies are just not worth it IMO. The color is so bad due to having to use colored filters. This is different from modern day passive or active systems.

The 3D of today would not be able to be shown on earlier displays, before hdmi 1.4 the bandwidth wasn't available for the bluray frame pack method. Hdmi 1.3 can be used for SBS and TnB because both of these methods halve the resolution (either vertically or horizontally).

Active 3D for front projection is a lot cheaper, less hassle, and doesn't require the average consumer to learn a bunch of techno stuff to use it....that is why those systems are in most homes with projectors.

Active 3D on a DLP projector is quite good compared to both active and passive plasma/lcd tvs.
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