Subject: Re: xawtv Full Screen & Screen Artifacts
Date: Wed, 7 Aug 2002 09:32:42 -0500
From: Billy Biggs <vektor@xxxxxxxxxxxx>
Reply-To: video4linux-list@xxxxxxxxxx
To: video4linux-list@xxxxxxxxxx
References: <00a501c23d1b$5686ee90$3302a8c0@VAIO> <200208061023.40301.stefan.bayer@xxxxxxx>
<00fd01c23e1b$d4063190$3302a8c0@VAIO>
Geoff Hibble (list.redhat.com@xxxxxxxxxxx):
> Capture -> GrabDisplay works. Cool. But a new problem exists whereby
> screen artifacts (horizontal lines) are drawn where there is movement
> in the picture. When the picture stops moving the artifacts mostly
> disappear and the screen looks normal. Any ideas?
What you're seeing is the result of viewing an interlaced stream of
fields as a sequence of full frames. To display an interlaced stream on
a progressive display, you must first deinterlace it.
There are lots of methods of deinterlacing with highly varying levels
of quality, be careful to select the method that is best for your
quality demands.
HTH,
--
Billy Biggs
vektor@xxxxxxxxxxxx
hi :
actually, i faced that problem before. i added a deinterlace routine,
which is the simplest one i know,
odd line number pixels are resulted from the even line number pixels
from above and below. well, any
other suggestion for the deinterlace algorithm ? also, after
the deinterlace, stutter effect results. i
guess that's due to the spatial effect after the deinterlace.
any idea ?
cheers,
kai
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