problem with video to film recording

Dec 30, 2003 31 Replies

The test we have done is with the same picture and sended in repetitive mode

100 times or more. We see in the computer monitor a preview of the image, but is in a proper window so we see always the same frame, but no the position, when is being sended. what we have seen when have developed the film is that the mecanical window is always in the same position (we see a little shadow of it), and inside this shadow the image is moved. The system has this parts: A computer with windows 2000 as operative system and a software called Werp, very simple but efective, that sends the image to the film recorder. The film recorder is a Phoenix Film recording system and the mecanical part is an Oxberry 3200. The Phoenix consists in some hardware cards and the monitor that raster the image. Really is a CRT film recording system as other (solitaire, etc). The Oxberry is a film camera, here there is no one electronic technology, is only basic film technologhy. The system comes to work in 120 or 100v, but we have transform it with a transformer to be used in 220v. The system is about only 1Kw. Also has a good ground connection, and one electricity stabilizer. We think the tension inside the system is correct because the density of the image is stabilized and good in every frame. The unique one we have no try it´s to convert the 50hz to 60hz. because this we think maybe here it´s the problem. Also it´s important the the movement it´s only in horizontal direction (perpendicular to the advance of the film in cine that we are talking). In vertical it´s perfect.

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We have tried with different resolutions: Pal, HD, 2k, 4k. Tif´s file that has been generated with the Discreet company software called Combustion. In the system we may catch (I´m no sure this is the word in english), vary the format in vertical depending the image (Panoramic, etc).

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On Wed, 31 Dec 2003 14:11:07 GMT, "TERESA" Gave us:

it appears that there is no image for the camera to record from. THAT sounds as if you are feeding the monitor with an unlike signal composition.

You should insure that both your source for the video, and the monitor receiving it are of the same format.

That sounds like a software problem. The registration of those images should be exact, so if they are not, the image rendering software has to be to blame, because there is no reason for them to shift. So the above info about format mismatch is probably not the issue, if you are indeed seeing the imagery.

This COULD be an issue with the type of monitor used. Three dot matrix or slot mask might make a difference at the camera level.

Since each shot only illuminates one gun at a time (hopefully), they can be in actual different locations. This would only be some portion of a millimeter, however. How big are the shifts?

On Wed, 31 Dec 2003 14:52:24 GMT, "TERESA" Gave us:

Each color gets exposed that long, or each color gets somewhere around than a seven second exposure?

We are talking about six or seven pixels of difference, no more "DarkMatter" escribió en el mensaje news: snipped-for-privacy@4ax.com...

projection.

Respect the mechanical we think this part of the system works correctly because we may see a very little shadow that means the camera window and it´s always in the same position. Also we may see the image that is moved respect this mask.

The three colors are in perfect position, really the image viewing alone is perfect in definition and color, so the three passes are positioned perfectly. We have no done one double exposure anytime, we may try to be what happens.

Respect the magnetic field. It´s also a possibility. We have two stabilizer of 500w each, from this we have two autotransformers of 500w each (220-110v), and from here one to the computer and the other to the film recorder. All of this is very closed to a brick wall in the office and also all of this goes to a multiple plug in the wall. The system is very closed in all of his components.

If were a magnetic field problem, which will be the solution?

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projection.

On Wed, 31 Dec 2003 22:38:19 -0500, **THE-RFI-EMI-GUY** Gave us:

It is a single frame real film camera. It opens its shutter, and the monitor displays three images, each for a given period, each of a different color separation.

film transport?

On Thu, 01 Jan 2004 14:10:19 GMT, "TERESA" Gave us:

make sure they are not proximal to the rendering monitor. Place them on the floor perhaps. One could also place anti-static foam on top of them, and or around the monitor for any RFI. For the EMI, a mu metal shield would have to be fashioned to cover them, if indeed, they are the source of the wiggle in your piggle.

are not really related.

Umm... it's not coincidence they coincide.

From TV history...

formatting link
"Transmission Standards

Different countries use different types of broadcast systems, most of which are to varying extents incompatible with each other. Television receivers require a source of "field timing reference signals". These are signals that tell the television receiver to be ready to receive the next picture in the stream of images. Early set designers decided to use the Mains power supply frequency as the source....

(seems *really* related, if only by design.) ;-)

The first reason was that if the mains supply and power source were not at exactly the same frequency, rolling hum bars would appear on the picture. The second reason was that the television studios would have had enormous problems with flicker on their cameras when making programs. There are two Mains power frequencies widely used around the world, 50Hz and

60Hz, dividing the worlds TV systems into two sects, the 25 frames per second sect (50Hz) and the 30 frames per second sect (60Hz)."

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