[mythtv-users] Objective IVTV quality measurement instructions
Jay R. Ashworth
jra at baylink.com
Fri Aug 13 21:31:51 EDT 2004
On Fri, Aug 13, 2004 at 09:50:43AM -0400, Cory Papenfuss wrote:
> I posted this awhile back, but I never got too many responses.
> My PVR-250 OEM has what I consider to be only adequate capture
> resolution. The TV it's connected to can do a better job of displaying
> cable TV signal and produces cleaner results. I've reduced the
> variables enough to know it's not my tvout on the mythtv box. Playing
> test patterns in a DVD player recording it with mythtv can help find
> this out. I mastered a burnable DVD image awhile back:
> The EIA1956 test pattern is on there, at 720x480. Since it's
> limited to 720 pixels, the test pattern itself is only 720*3/4=540
> "lines of resolution" on a 4:3 TV. My pvr250 can only resolve about
> 400-450 lines, even when capturing via the svid direct from the DVD
> at 720x480. The TV OTOH can resolve the full 540 lines when connected
> directly to the DVD player.
> Anyone who feels like testing this and reporting back would
> be appreciated. I discovered just how crappy my low-end BTTV
> card was (350-400 max)... took it out of the box after that.
*Ghod*, I love grad students.
We just wouldn't get as much done in the US with grad students.
I'll be trying this out in the next day or three, Cory; thanks. Does
the image have any other useful test patterns on it? I align a fair
number of TV's and projectors in a year...
Jay R. Ashworth jra at baylink.com
Designer Baylink RFC 2100
Ashworth & Associates The Things I Think '87 e24
St Petersburg FL USA http://baylink.pitas.com +1 727 647 1274
"You know: I'm a fan of photosynthesis as much as the next guy,
but if God merely wanted us to smell the flowers, he wouldn't
have invented a 3GHz microprocessor and a 3D graphics board."
-- Luke Girardi
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