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evilchris
11-16-06, 12:53 PM
Question: If you feed a 1080i signal to a 1080p TV, is there any difference compared to feeding it a 1080p signal?

S.I.N
11-16-06, 01:10 PM
http://en.wikipedia.org/wiki/1080i
http://en.wikipedia.org/wiki/1080p

Is the answer Sony sucks?

six_storm
11-16-06, 01:12 PM
Woot! My vote counts for 100%!!! :D :D :D

There is a difference because 1080i has to be delaced doesn't it? Dang my memory sucks.

evilchris
11-16-06, 01:14 PM
Woot! My vote counts for 100%!!! :D :D :D

There is a difference because 1080i has to be delaced doesn't it? Dang my memory sucks.
Yes a 1080p TV will deinterlace a 1080i signal. The question is, would the there be a difference whatsoever in the picture?

six_storm
11-16-06, 01:20 PM
Yes a 1080p TV will deinterlace a 1080i signal. The question is, would the there be a difference whatsoever in the picture?

Wouldn't it be like comparing 720p vs 1080i? 720p is smoother, while 1080i has been picture quality.

evilchris
11-16-06, 01:21 PM
Wouldn't it be like comparing 720p vs 1080i? 720p is smoother, while 1080i has been picture quality.

No it would not. If you deinterlace ( properly ) a 1080i feed, what is the result?

MustangSVT
11-16-06, 01:25 PM
There's no difference only if it's film based material. If it's a videogame or video based material, there would probably be some difference I think.

However, the fact that many ppl with 1080p TVs feed it with 1080i signal from Xbox360 and say it looks great makes me wonder. I know that with film based material it just de-interlaces it perfectly using 3:2 reverse pulldown or whatever so the progressive frames can be reconstructed perfectly per se. Whereas with 1080i60, I think you'd lose some data if it's a 60fps 1080p game. Not sure about video based material originating from 1080p30.

All I know is that with HD-DVD, 1080i/1080p input doesn't make a difference (neither with Blu-Ray). Not sure about 60fps games.

evilchris
11-16-06, 01:29 PM
MustangSVT's got it. he is teh winner!

What HD-DVD player you running?

Zelda_fan
11-16-06, 02:18 PM
It depends on your de-interlacer. There are several methods of de-interlacing, some much better than others. Most TVs are equipped with poor de-interlacers, so their very well may be a difference in quality. However, if you have a high end video processor, the resulting image will be within 95% of what the 1080p image would have looked like.

http://en.wikipedia.org/wiki/Deinterlacing

Deinterlacing is the process of converting interlaced video (a sequence of fields) into a non-interlaced form (a sequence of frames). This is a fundamentally impossible process that must always produce some image degradation, since it ideally requires "temporal interpolation" which involves guessing the movement of every object in the image and applying motion correction to every object.