| Author | Message | ||
     dmx3d Rating: N/A |
Hello Sir/Madam, I want to know how cinema film projectors project 3D? Is it that 2 different images present in the film in field sequential format??? How do I get the sync,if I use active shutter technology??? I think that video in. is not present in Cinemascopic projectors?? Please help me.. Rahul.. | ||
| M.H. Rating: N/A |
Cinema range 3D proejctos (used for Chicken Litte) works in follwing way: You have 2 video servers, one with left on with right view. They feed the proejctor by SDI singals and the proejctors mix internaly the imgae and produce page flippin stereoscopic output. Page flipping is transofrmed to circual polaization = no need to sync. glasses. Can you tell us what do you exacly need ? | ||
| Scott Warren Rating: N/A |
When you say "film", are you actually talking about real film stock, or are you asking about digital cinema? If the former, there are a number of ways the film can be projected... 1. Film release print is anaglyph composite (grey or color most common) of the 2 separate master prints. Projected with 1 standard projector. This is the cheapest way to do it. Examples: SpyKids3 2. Film release print is 2 separate prints synchronously run side-by-side on 2 separate projectors, with polarizing filters in front of the projection lens, combined onto the polarization-retaining screen. Expensive and cumbersome 'cuz of 2 prints and 2 projectors. Rare now. Promoted in '50's, but lost out in favor of... 3. Film release print is VERY anamorphically squeezed (horizontally) side-by-side images on single film, run by single projector, with 2 polarizers and modified anamorphic lens which expands, then bends (or reflects w/mirrors) the 2 images, so they combine on screen. Alternately,... 4. Similar to above, but VERY anamorphically squeezed (vertically) images situated above and below on single film, etc. These 2 have been the most common forms of polarization projection of film until recently. 5. Similar to the 2 above, but with 2 film frames being used, need to modify the projector (quite difficult) to run 2 frames through the gate at a time. Also uses twice the amount of film, so reels are shorter in duration. Rare. Benefit over the above is no loss of resolution from the anamorphic process. 6. Film is alternate frames like above, but projector is run at dual speed and timecode/filmperf-synchronized IR controller activates LC shutter glasses. Most commonly seen at LCS-equipped IMAX theatres. Still, uses up twice as much film. Similarly,... 7. Same setup, but with the addition of a projection Z-screen in front of the lens, synchronized with the timecode/filmperf, and a polarization retaining screen, allows the use of cheaper Polarized glasses. Also seen at IMAX. Of course, with Digital Cinema breaking out, you will have electronic/computer/video server versions of these last 2 (and maybe the 1st one also for cheapskates). There are probably a few other variations, but that covers most installations. HTH, Scott | ||
| dmx3d Rating: N/A |
Hello Sir, I went through your points but my basic requirement is that: 1. I have a cinema projector and couple of shutter glasses with IR Transmitter... I want to project 3D using film release print in field sequential stereoscopic format and view them using shutter glasses..Is this possible?? 2. Other Basic requirement is of projecting 3D on 50 feet screen using multiple projectors.. Is this possible.. Please mention your e-mail id, so that i can talk to you personally.. | ||
| Alatar Rating: N/A |
Scott: It's been a while since I was closely involved in this end of the business, but I think you will find that IMAX doesn't actually use your 7) as the film velocity is too high and you can't take advantage of the film advance (pull-down) time to be showing the other eye. It essentially means that each eye is only illuminated 25% of the time -- because the exposure is [expose right - pulldown - expose left - pulldown]. The 3D space camera works this way (i.e. both eyes alternating on the same filmstrip) but I've not heard of an IMAX projector being set up that way (although it's been possible since the development of the old IMAX HD 48FPS systems). Many IMAX theaters use a method you don't mention: the dual-rotor projector. In this design, there are two horizontal film paths, one only a few inches above the other, and a single lamphouse. There are also some IMAX 3-D theaters that use two syncronized projectors, some of the reasons / advantages being: - very easy to switch between 2D and 3D; - easy to maintain / repair one projector while other continues (2D) shows; - you can sell a 2-D system first, then convert to 3D by simply adding another projector; - easier cooling for high-output systems. | ||
| Alatar Rating: N/A |
Sorry, I meant "your 6)" not "your 7)". | ||
| dmx3d Rating: N/A |
Are film release print available in field sequential format?? If yes, how can i project it usng single cinema projector.. If no, is there any way by which I can convert the film (using servers,.. etc) into the same format getting the sync for shutterglasses. | ||
| Scott Warren Rating: N/A |
Film doesn't use "fields" (that's a video thing), so there's no such thing as native "field-sequential" in film. However, LC shutterglasses can be used with frame sequential. The problem there is framerate. Staying with low framerate gives the viewer the objectionable perception of flicker, going with the higher (double) framerate requires that the projector be able to capable of that speed (like alatar implied re: IMAX). I don't specialize in cinema projection, so I'm not the best resource for that kind of stuff. Alatar, thanks for the clarification. I knew there were a couple of other variations...(dual filmpath/gate!, how 'bout that-let me guess, do they wind in opposite directions?) Scott | ||
| Alatar Rating: N/A |
AFAIK there's only a single rotor, about 10 inches high. One strip runs at the top, the other at the bottom; but it may have been only the old MPX projectors that work(ed) that way. As I said, it's been many years since I was involved in the projection end of things. | ||
| dmx 3d Rating: N/A |
Hello Sir, I just want to know that how can I project 3D using films and watch them with LCS glasses. What kind of video server would I need, what will be the inputs and outputs? Where will I get the sync for the glasses and what if the video in socket of the cinema projectors is absent? I'm not understanding anything.I do not want to know about what IMAX does and want to know about what I can do... | ||
| dmx 3d Rating: N/A |
Hello Sir, I just want to know that how can I project 3D using films and watch them with LCS glasses. What kind of video server would I need, what will be the inputs and outputs? Where will I get the sync for the glasses and what if the video in socket of the cinema projectors is absent? I'm not understanding anything.I do not want to know about what IMAX does and want to know about what I can do... | ||
| Alatar Rating: N/A |
If using film, you need two film projectors, syncronizing circuitry, and two reels of film. If using video, you need a video server (e.g. a PC with an nVidia card and Peter Wimmer's "StereoPlayer" software), a projector capable of alternate-eye projection (e.g. QDepth) and stereo video content (in the form of a data file). Both methods need to drive alternate eye glasses. For this you need an appropriate output from the projector(s), and either wired glasses or an IR transmitter / wireless glasses combo. The above is based on alternate-eye stereo, you may find it easier to use a polarized approach. In this case, the lists above would be quite different. | ||
| jass Rating: N/A |
I introduction web http://www.elec-micro.com | ||
| jass Rating: N/A |
I introduction web http://www.elec-micro.com many have project | ||
| Christopher R. Mohr Sr. Rating: N/A |
When, if ever, will the 3D films of the fifties be released in the 3D DVD format so that they may be viewed with shutter glasses? | ||
| Charles Rating: N/A |
Christopher: I assume you're talking about legal commercial DVD versions of those movies, since pirated copies of varying quality have been sold on eBay for years. The major studios will probably never release any of those movies in shutter glass 3-D DVD format, because they believe (and they are correct) that the market would be much too small to be profitable. | ||
| classic 3D Rating: N/A |
Please give me full details, If I want to play the digital format 3D Movies like chicken little 3D. 1.What all hardwares will be required? 2.In what form will the movie be present in the hard disk? 3.What is more preferable polarised or shutter? 4. If using two servers, how to distribute the inputs? 5. Using 2 projectors, what all hardwares will be required for 3D movies to be viewed using polarised glasses? | ||
| M.H. Rating: N/A |
Christopher: Charles is 100% right. We had made in the past the price calcaltion of the films scening + putitng on DVD. The most epxensive is not the right to the movies, nor DVD prduction but the film scaning ... Withauth growing the markete with 3D vizaulziation device it is non-profitable. Answer: they will be relized when aprox. 1% of DVD playback devices owners will have 3D vizaulziation setup as well .... | ||
| M.H. Rating: N/A |
classic 3D Answers: 1) PC, shuterglasses, IR emmiter, DepthQ projector, DpethQ Server or stereocopci player software 2) there exist a lot of formats. DVD use interlaced mpeg2 ... 3) ofr hom use - shuttersr, for mor than 10-20 people, polarized 4) Why to use 2 servers ? 5) PC, DepthQ projector, DethQ Server or stereocopci player software, 2x proejctors (with lens shift), polarization filers, glasses, dual projection omntage, special silver non depoalarizng scree | ||
| classic 3D Rating: N/A |
What so special in depthQ projector and DepthQ server. Do we have an alternative for that? Can a normal good projectors like Benq,Sharp,Philips,Panasonic do that work??? dual projection omntage:- Please illustrate this one too. then it seems that the chicken little 3D Movie in the harddisk can be converted using stereoplayer software but what format should it be converted for viewing with shutter glasses or polarised glasses? |
