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Blurry horizontal move.

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Old 03-17-2008, 03:16 PM   #1  
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Default Blurry horizontal move.

I bought a Panasonic plasma believing that movement artifacts had been conquered. Of course, nobody shows you any fast movement in the shop setups. All nice and slow. But at home I noticed how unreadable horizontally moving text was (some TV programs had it at the end for instance) where it used to be very readable. When I looked closely, I noticed the blurryness was created by multiple copies of objects where there was supposed to be just one (e.g. multiple characters).

So, I created a SD PAL DVD image of a few scenes with horizontally moving white text on a black background (both directions). It can be found here:

ftp: / / ftp.nluug.nl/pub/av/gwvideotest/ScrollTestPAL.img

(sorry, I am not allowed to post a real URL, just remove the spaces)

When I play this on my progressive scan Panasonic DVD-S325 connected via composite to my Panasonic TH37PV70, I see multiple copies of the objects scrolling horizontally, up to 3 copies for each image whe the images move fast. I find the lines of vertical bars moving horizontally to be the clearest, but the moving circles also nicely show the 'doubling/tripling'.

Per frame, it is clear that there is only one copy.

I tested the same DVD on a Philips LCD where I got two 'echoes' (instead of max three) but additionally I got distortions when two lines of objects moving in opposite directions are above each other.

Now, I am wondering what this effect is. Since it is 576p, I think it cannot be interlacing. Since I can see this on plasma and LCD I think I can rule out 'plasma after glow'.

But I have no idea what this effect is and what it's cause is. And more important for me: can anything be done about it? Because this effect really kills the fun of looking at many things.

Is there some guru who can explain what I am seeing? And maybe what can be done about it?
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Old 03-17-2008, 03:28 PM   #2  
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I was not able to open the URL. Try reposting it now that you have enough posts.
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Old 03-25-2008, 10:18 AM   #3  
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Quote:
Originally Posted by rbinck View Post
I was not able to open the URL. Try reposting it now that you have enough posts.
Sorry for the delay, the message ended up in my spam filter.

Here it is:
ftp://ftp.nluug.nl/pub/av/gwvideotest/ScrollTestPAL.img
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