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Author Topic: Barco 32B color Alignment Issue Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 01-01-2019 07:00 PM                     I never did convergence this way, just wanted to see what a generic still camera could do. Those cameras can usually be hooked up to a monitor or notebook for relayed display if necessary. - Carsten  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 01-02-2019 08:33 AM                     Many medium priced still cameras also support live view on a smartphone through WiFi, so you can put the camera where ever you need it and have the convergence target visible on your smartphone.  |  IP: Logged Bruce Cloutier Expert Film Handler Posts: 161 From: Gibsonia, PA, USA Registered: Aug 2016 posted 01-02-2019 10:38 AM                        I've found this topic interesting. I had a product concept along these lines. I owned one of the Pioneer Elite rear projection TVs which were the first to offer 1080p (I think) resolution in rear projection (upscaled) which was burdened by this alignment procedure (for each video mode). I think there were a couple of hundred points in a rectangular pattern across the screen where you would adjust R G or B for alignment. That in turn affected the linearity of the image in the area and often drove you back to readjust adjacent locations. Without having done this on the big screen, I hope it isn't the same nightmare. Is it? I figure you could use a camera as you say but maybe a program in a device like the JNIOR running JANOS with a camera input could automate the alignment process and generate the proper inputs for whatever projector. Ultimately producing a report and before/after pattern images. Of course, without firsthand knowledge of this process the concept never went anywhere. It is the kind of generic application in a niche that INTEG likes to do. I would need a local theater where we could experiment. We could develop the concept even using the old TV (which I still have but don't use). But, we also don't know if there is any interest or really, a market. I think a lot of useful stuff fails to become reality for reasons like that. People like to get paid to do the alignment too I bet.  |  IP: Logged Harold Hallikainen Jedi Master Film Handler Posts: 906 From: Denver, CO, USA Registered: Aug 2009 posted 01-02-2019 11:49 AM                        This reminds me of a USL/Christie patent that provided an automatic method of adjusting the projector mirror for even screen luminance. See https://patentimages.storage.googleapis.com/30/09/2d/c02fec2306c1ed/US6013911.pdf . Harold  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 01-02-2019 12:03 PM                     Christie's thing was adjusting the lamp, not the mirror (despite what may be discussed in the patent). Christie had motorized lamp adjusters in the last generation of their consoles/lamphouses. Bruce, convergence, at the moment, is not a motorized thing. I'm sure it could be, though it would add significantly to the cost. It is done either via flex-shafts or using set screws (with counter pressure applied by spring loaded set screws). Could it be automated? Sure. I don't know anyone that will pay for it because the bulk of your cost is going to be in the projector waiting for the day it is used. The VCC-102 was a relatively inexpensive and worked with one's handy laptop.  |  IP: Logged Bruce Cloutier Expert Film Handler Posts: 161 From: Gibsonia, PA, USA Registered: Aug 2016 posted 01-02-2019 04:07 PM                        quote: Steve Guttag Bruce, convergence, at the moment, is not a motorized thing. I'm sure it could be, though it would add significantly to the cost. It is done either via flex-shafts or using set screws (with counter pressure applied by spring loaded set screws). Oh ok. With the Pioneer screen you moved from point to point and selected the color then used directions on the remote to overlap the points making pure white without edge coloring. A crazy amount of work to get it good enough to appease a perfectionist. Trust me. Would be interesting to automate.  |  IP: Logged Harold Hallikainen Jedi Master Film Handler Posts: 906 From: Denver, CO, USA Registered: Aug 2009 posted 01-02-2019 04:38 PM                        Thanks Steve! I never saw one of the USL/Christie things, just read about it. Bruce, I suspect the TV is doing alignment of the current and waveform through the deflection coils, so no motors there. Harold  |  IP: Logged Bruce Cloutier Expert Film Handler Posts: 161 From: Gibsonia, PA, USA Registered: Aug 2016 posted 01-03-2019 06:30 AM                        Well, one of these days I'll find out how the alignment is accomplished. I plan to dismantle the thing for disposal. It has a really nice large black piano finish cabinet that cries out to be reused for something. Maybe a fish tank? But I agree, there are likely no motors. It has to have been done electronically. That TV is c1990 when the RoHS standards were first being applied. A faulty solder was used that with temperature cycling would eventually crack breaking connections. The TV would fail. Of course, I would just pull the boards and re-solder. And, some almost 30 years later I still have a useless but functional TV occupying space. Anyway, I lack the direct theater experience that would allow INTEG to be more helpful. We just picked up an order for JNIORs in a theater right down the road. We're going to try to strike up a relationship so we can visit and get some direct feedback.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 01-03-2019 07:00 AM                     I had one of these early analog projection TVs as well. There was a bank of pots to adjust convergence over the full screen. I know that later revisions allowed this to be done with a remote as well, and they probably had eepot or D/A converter banks to do the actual adjustments. There are certainly more ways to use a JNIOR in cinemas in addition to the classic applications as light and curtain control. Not only the actual application is of interest, but also the means to apply user interaction. E.g. all servers enable automatic actions in playlists, but playlists are only active during an actual movie showing. So, one has to look closely at what happens when and what is useful for the operator. I am sure that cinema will have a good time with you sneaking in. Convergence on digital cinema projectors is only done so rarely, that automation doesn't make sense. Bulb adjustment for xenon systems happens often enough (with every bulb change) that it makes some sense, even though some operators choose to refine the automatic setting manually afterwards. However, there is no way to retrofit adjustment gear practically. Bruce - ever thought of adding IR remote control as an expansion module? Now, this should go to another thread probably... - Carsten  |  IP: Logged

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