[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Coments re: Film Reg. -Reply

Mike Chiado wrote:
> > The film is allegedly scanned in 8 places per film frame,  > which
> would probably mean a total of 16 sensors (one each  > for X & Y
> position detection for each film performation).
> I recall from the ITS demo that 8 perfs were used for vertical
> stabilization, but only 2 perf pairs were used for horizontal.  I
> guess that means that 4 instead of 8 perfs are used for horizontal
> stabilizing.  No explanation was offered for the different number of
> perfs used for the y versus x directions.

If in fact it is an intermittent pull down, I find it 
interesting that they are sensing the position of the frame
electronically after its just been pulled down in real time 
by a mechanical claw.??  By the way, is it pulled down by a 
mech claw?

I would tend to think that most likely, all horiz correction
is by done by edge guiding and the 8 perfs (or whatever) is all 
for vertical positioning.  Otherwise, as I have stated before, 
the horiz correction (which requires probably more accurate 
detection and much more precise and complex correction) would 
probably not rely on this technique.

If there is only x and y (optical 'glass') correction then 
why measure the perf in two places for precision horizontal 
correction beyond that of edge guiding?

mailinglist digest available......posting guidelines on the webpage
the Telecine Internet Group  <http://www.alegria.com/telecinehome.html>

Follow-Ups: References: