[opendtv] Re: Why Europe should choose 720P for HDTV

  • From: "John Shutt" <shuttj@xxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Mon, 13 Dec 2004 10:58:10 -0500

In recent years, with the advent of CCD cameras with electronic shutters, it 
has become standard practice for all but the main "up" camera (the one that 
gives the overall view of the field from the press box) to have the shutters 
cranked up.  This does two things, one good, one bad IMHO.

The good thing is the faster than 1/60th shutter speed captures motion much 
better, and gives crystal clear slow motion replays.  However, the bad thing 
(to me) is that during the play if one of these 'cranked' cameras is aired 
live, the motion has a definite stroboscopic effect that I still find 
annoying even after watching it for years.

The natural blurring that occurs within the camera during a 1/60 second 
exposure (for a field of video) makes the resulting motion appear more 
'natural' to me.  Capturing video at 1/1000 second exposure does provide for 
very good slo-mo replays, but lousy real-time video.

Perhaps this is the phenomenon you are witnessing, Doug?


----- Original Message ----- 
From: "Doug McDonald" <mcdonald@xxxxxxxxxxxx>

> This is because, it appears ... and I mean, that is what it looks like
> to me ... that the camera has a finite acquistion time, say 1/60 or
> 1/100 or 1/200 second.
> It appears like it might be some sort of frame transfer device: it
> averages the light for a certain amount of time, and then dumps the
> whole picture to a buffer, which is digitized. If so, this would
> allow "shutter" times shorter than 1/60 second. And that seems to be
> what I sometimes see.

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