[mythtv-users] Finally... OBJECTIVE PVR250 Quality measurment

[Debabrata Banerjee]

Anyone want to try this test, but after setting saturation to about 30
(default is 63), and/or color=~16000 in mythtv? I always noticed this too,
recently I started fiddling with it to get the colors down to a "normal"
level, and to my surpise the image got much sharper when I did. Almost like
the colors were "blooming". I don't have a the hardware to test this
objectively myself.

Thanks,
Debabrata

----- Original Message ----- 
From: <papenfuss at juneau.me.vt.edu>
To: "Discussion about mythtv" <mythtv-users at mythtv.org>
Sent: Wednesday, March 17, 2004 4:12 PM
Subject: Re: [mythtv-users] Finally... OBJECTIVE PVR250 Quality measurment


> On Wed, 17 Mar 2004 steve at nexusuk.org wrote:
>
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > On Wed, 17 Mar 2004 papenfuss at juneau.me.vt.edu wrote:
> >
> > > OK folks... I have finally cooked up an *easy* and *objective* way to
> > > verify the quality of video captures.  It's based on the EIA1956
standard B&W
> > > TV test pattern that can be found snooping the 'net.  I made an image
that can
> > > be burned to a DVD and played in a set-top player.  The resolution is
720x480,
> > > which is (as good as or) better than anything the PVR-250 alegedly can
capture.
> > > If there's some interest, I'll find a place to post it.  The DVD image
zipped
> > > up is only 500KB.
> >
> > Except the quality of digital video compression systems is mainly only
an
> > issue with moving images...
> >
> Yes and no.  If you can't capture a still frame at high resolution,
> though, you certainly can't capture motion at high resolution.  The
> bitrate/resolution thing is an entirely separate issue, and one that's
much
> harder to quantify.  The image quality problem I'm seeing looks like
simple
> analog lowpassing to me.  Analog video bandwidth, pure and simple.
>
> ... Although you did raise an interesting point.  Capturing from the
> /dev/yuv (the raw YUV capture buffer, right) would rule out any encoding.
> Might try that... or anyone else feel free.
>
> -Cory
>
> >
> >  - Steve
http://www.nexusuk.org/
> >
> >      Servatis a periculum, servatis a maleficum - Whisper, Evanescence
> >
> > -----BEGIN PGP SIGNATURE-----
> > Version: GnuPG v1.2.3 (GNU/Linux)
> > Comment: Public key available at http://www.nexusuk.org/pubkey.txt
> >
> > iD8DBQFAWKY05zUOsIV3bqERArnJAJ4y5+swmJ2cm8fbOHyaC7TWzKkhygCcCpEG
> > Sf65MTeG2KHHmpi4/zVoops=
> > =Nlp7
> > -----END PGP SIGNATURE-----
> >
>
> -- 
> *************************************************************************
> * The prime directive of Linux:  *
> * - learn what you don't know, *
> * - teach what you do. *
> * (Just my 20 USm$) *
> *************************************************************************
>
>
>


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