Peculiar effect on the Masters golf

Can anyone please explain the effect seen on the masters golf when the
cameras are following the ball against a dark tree background. The
ball appears to stutter when against the trees but is OK when against
the sky. Is this anything to do with the compression used.

Thanks in advance

John - watching via Freeview

"JohnW" wrote in message
oups.com...
Can anyone please explain the effect seen on the masters golf when the
cameras are following the ball against a dark tree background. The
ball appears to stutter when against the trees but is OK when against
the sky. Is this anything to do with the compression used.

Thanks in advance

John - watching via Freeview

i noticed this earlier on virgin box and tosh 37wlt68 tv

"ady2007©" wrote in message
...

"JohnW" wrote in message
oups.com...
Can anyone please explain the effect seen on the masters golf when the
cameras are following the ball against a dark tree background. The
ball appears to stutter when against the trees but is OK when against
the sky. Is this anything to do with the compression used.

Thanks in advance

John - watching via Freeview

i noticed this earlier on virgin box and tosh 37wlt68 tv


I thought it was my pioneer plasma playing up. Oddly I had changed all the
picture settings earlier in the day to what someone had suggested on another
AV forum. I have to say the difference in picture is quite astounding.

Seems it's not my TV but something else.

Mel.

"Mel" wrote in message
...

"ady2007©" wrote in message
...

"JohnW" wrote in message
oups.com...
Can anyone please explain the effect seen on the masters golf when the
cameras are following the ball against a dark tree background. The
ball appears to stutter when against the trees but is OK when against
the sky. Is this anything to do with the compression used.

Thanks in advance

John - watching via Freeview

i noticed this earlier on virgin box and tosh 37wlt68 tv


I thought it was my pioneer plasma playing up. Oddly I had changed all the
picture settings earlier in the day to what someone had suggested on
another AV forum. I have to say the difference in picture is quite
astounding.

Seems it's not my TV but something else.

Mel.

I noticed the same effect on my Pioneer plasma. Please can you tell us more
about the picture settings you changed?

Thanks

Malcolm H

JohnW wrote:
Can anyone please explain the effect seen on the masters golf when the
cameras are following the ball against a dark tree background. The
ball appears to stutter when against the trees but is OK when against
the sky. Is this anything to do with the compression used.

AIUI the Masters golf was covered by the American host broadcaster in HD,
therefore presumably originated in 1080i/60 or 720p/30. The Beeb would have
been converting to 1080i/50 for their HD channel, and 576i/50 for
DTT/D-Sat/Analogue. Could have been an artefact with either/or of those
conversions.

--
Mark
Please replace invalid and invalid with gmx and net to reply.

----- Original Message -----
From: "Mark Carver"
Newsgroups: uk.tech.digital-tv
Sent: Monday, April 09, 2007 10:32 AM
Subject: Peculiar effect on the Masters golf


JohnW wrote:
Can anyone please explain the effect seen on the masters golf when the
cameras are following the ball against a dark tree background. The
ball appears to stutter when against the trees but is OK when against
the sky. Is this anything to do with the compression used.


We have had 'stuttered' movement for years on terrestial & digitial
broadcasts. I think ever since video tape was ditched in favour of digital
recording we have suffered the problem. It is as if there are now less
frames per second on digital systems. Too small a bandwith ? Circuitry not
fast enough for video yet ?
Digital still cameras have reached an acceptable quality now but we are far
off acceptable quality for video & TV broadcasting. Ofcom are of course
useless in maintaining any standard whatsover !

Stef
..

On Mon, 09 Apr 2007 22:29:31 GMT, "Stefan"
wrote:

JohnW wrote:
Can anyone please explain the effect seen on the masters golf when the
cameras are following the ball against a dark tree background. The
ball appears to stutter when against the trees but is OK when against
the sky. Is this anything to do with the compression used.


We have had 'stuttered' movement for years on terrestial & digitial
broadcasts. I think ever since video tape was ditched in favour of digital
recording we have suffered the problem. It is as if there are now less
frames per second on digital systems. Too small a bandwith ? Circuitry not
fast enough for video yet ?

There are a couple of things that broadcasters routinely do to
pictures that can give a stuttering effect. One is the effective
duplication of information from alternate fields to give the effect of
the image being updated only 25 times per second instead of 50. The
decision to do this is taken in the name of "art" by people who don't
understand the technology because they think the result looks like
film, and that this somehow makes it look like a higher quality
production.

In the case of a sports broadcast I'd expect it to be the other
effect, which is the use of an electronic shutter in the camera. This
wasn't possible with tube cameras, but chip cameras can be set to
collect light over a shorter time interval than the 50th of a second
required to read out the resultant field, effectively giving a short
exposure time. This gives a sharper image for still frames, which is
presumably why they do it, but it can look a bit odd on moving ones.

Rod.

JohnW wrote:
Can anyone please explain the effect seen on the masters golf when the
cameras are following the ball against a dark tree background. The
ball appears to stutter when against the trees but is OK when against
the sky. Is this anything to do with the compression used.


It could be an example of the optical illusion described he

http://www.michaelbach.de/ot/mot_feet_lin/index.html

(Flash based site).

Cheers

Rob

Rob Summers wrote:
JohnW wrote:
Can anyone please explain the effect seen on the masters golf when the
cameras are following the ball against a dark tree background. The
ball appears to stutter when against the trees but is OK when against
the sky. Is this anything to do with the compression used.


It could be an example of the optical illusion described he

http://www.michaelbach.de/ot/mot_feet_lin/index.html


I should add, only if the background is branches and sky.

Rob

"Rob Summers" wrote in message
...
Rob Summers wrote:
JohnW wrote:
Can anyone please explain the effect seen on the masters golf when the
cameras are following the ball against a dark tree background. The
ball appears to stutter when against the trees but is OK when against
the sky. Is this anything to do with the compression used.


It could be an example of the optical illusion described he

http://www.michaelbach.de/ot/mot_feet_lin/index.html


I should add, only if the background is branches and sky.

Rob


I don't know about sport - never watch it, but stuttered or stroboscopic
vision is on an increasing amount of programmes both on terrestial & digital
on CRT. I just don't think that digital recording is yet up to what I
consider to be broadcast quality. !

Stefan