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How does telecine work?


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#1 Jamie McIntyre

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Posted 26 May 2007 - 02:06 PM

How does a picture negative get scanned and be recored onto a minidv?(for example)

Im confused O.o
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#2 Robert Houllahan

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Posted 26 May 2007 - 09:09 PM

How does a picture negative get scanned and be recored onto a minidv?(for example)

Im confused O.o

There are two types of telecines in wide use today, the Flying Spot or CRT type and the CCD type. Both have very complicated digital servo systems that transport film with a capstan (not a pulldown claw or sprocket system) at a highly precise continuous rate through a gate with a cold light source (Bulb or CRT) which passes through the gate and film the result is then "detected" by 3 photosensitive devices in Red, Green,Blue (Photomultiplier tubes or 3 CCD arrays) and the whole sum of the rate of transport, the scan through the gate and the RGB pickups are assembled together in a frame store (call it a picture bucket) which then outputs the video at whatever standard you want (NTSC, PAL, HD, Data) usually the output is Uncompressed 10bit SDI which then goes through the Color Corrector and on to a deck, in the case of MiniDV maybe a SDI to YUV converter all compression would take place in the VCR doing the recording be it MiniDv, DigiBeta or D5.

Hope this helps.

-Rob-
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#3 Adam Frisch FSF

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Posted 27 May 2007 - 04:24 AM

Good explanation by Robert.

Just wanted to add that there is third type, the intermittent telecine like the Vialta and many of the 2K scanners, like the NorthLight. They basically work a a precision projectors
where the frame stops and gets photographed by a high resolution CCD camera and lens for each frame.
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#4 Robert Houllahan

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Posted 27 May 2007 - 11:08 AM

Good explanation by Robert.

Just wanted to add that there is third type, the intermittent telecine like the Vialta and many of the 2K scanners, like the NorthLight. They basically work a a precision projectors
where the frame stops and gets photographed by a high resolution CCD camera and lens for each frame.



True this, and scanners like the Arri, for example, use a B+W sensor and 3 Color LED lights that flash "low" then "high" to capture more dynamic range. Also they generally use better, slower, imagers than real time machines and have things like a IR pass for dust busting.

-Rob-
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#5 Dominic Case

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Posted 27 May 2007 - 06:25 PM

True this, and scanners like the Arri, for example,

Yes, but they aren't telecines.

And they certainly aren't used to transfer to mini-DV.
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