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- Xref: sparky comp.compression:2851 rec.video:9704 rec.video.satellite:3837 rec.video.production:1182
- Path: sparky!uunet!gatech!rpi!uwm.edu!rutgers!uwvax!astroatc!vidiot!brown
- From: brown@vidiot.UUCP (Vidiot)
- Newsgroups: comp.compression,rec.video,rec.video.satellite,rec.video.production
- Subject: Re: NBC Olympic coverage - reason
- Message-ID: <3715@vidiot.UUCP>
- Date: 28 Jul 92 17:48:26 GMT
- References: <MONTA.92Jul26181344@image.mit.edu> <1992Jul27.035759.153188@zeus.calpoly.edu> <Bs2ACw.GBE@watserv1.uwaterloo.ca>
- Reply-To: brown@vidiot.UUCP (Vidiot)
- Organization: Vidiot's Hangout
- Lines: 34
-
- In article <Bs2ACw.GBE@watserv1.uwaterloo.ca> elball@sunee.waterloo.edu (Eric Ladd Ball) writes:
- <The reason for the artifacts is quite simple. NBC is using digtal
- <full-frame camaras. These are sequential line instead of NTSC interlaced.
-
- This is news to me. The main feed is provided by RTU, the host country TV
- network. They are PAL cameras.
-
- If they were full frame, then conversion to field PAL or NTSC would result
- in two fields looking exactly the same. Motion would only update every 30th
- of a second. I know this to be false, since I can look at each field and see
- motion (using 3/4" pro gear, not VHS consumer).
-
- Many of today's CCD pro cameras have shutter modes just like consumer cameras.
- This results in nice crisp slo-mo shots. See previous postings regarding
- special slo-mo equipment that is also being used.
-
- <PROs:
- <1> Freeze-frame/super-slo-mo are artifact free.
- <2> Easy capture for still-frame printing (ie magazines etc)
- <3> Easy translation to different TV formats (ie PAL) in digital logic.
- < (ie throw away 1/6 of the frames for PAL, chop off lines on the top &
- < bottom for NTSC)
- <
- <CONs:
- <1> The artifacts of fast motion everyone has seen. This is caused because
- < the interlaced lines appear on sub-sequent fields and look very wierd.
-
- I do not believe any of this is actually occuring. See previous postings
- regarding new technology PAL -> NTSC converters.
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