What exactly is deinterlacing?

[Phatferd]

My TV has the option to turn this off or on. I don't really know what it means. I think it has to do with how the TV takes a signal smaller than 1080p and recreates it into a 1080p signal.

Which option should I choose for my TV? On or off?

[Phatferd]

Originally Posted by rragland

The "i" stands for interlaced, and the "p" stands for progressive. 1080i is a 1920x540 resolution signal where every other frame (actually called a field) is interlaced with the frame after it, giving you a perceived total resolution of 1920x1080.

1080p is a 1920x1080 resolution signal with no interlacing, and every frame containes all the resolution, and thus all the detail.

1080p is more desireable than 1080i since all the detail is in each frame. A 1080p signal however uses twice the bandwidth since there is twice the information being transmitted.

Thank you, but I understood that much already . My big question is should I set my TVs "deinterlace" setting to On or Off?

[Edh63]

The "i" stands for "interlace". Here let me use that in a sentence for you.

"I was trying to tie my shoes the other day and my shoestrings became interlaced, so I missed the bus".

The "P" stands for "Progressive". Again, allow me to use that in a sentence for you.

"Since my shoestrings became interlaced and I missed the bus, I was very progressive and took my switchblade out and cut my shoestrings which allowed me to run faster after that damn bus"!

I know, this did nothing to help you. But it may have helped the butt-head that could actually relate to this.

[PS3 Blu-Ray]

Originally Posted by Edh63

The "i" stands for "interlace". Here let me use that in a sentence for you.

"I was trying to tie my shoes the other day and my shoestrings became interlaced, so I missed the bus".

The "P" stands for "Progressive". Again, allow me to use that in a sentence for you.

"Since my shoestrings became interlaced and I missed the bus, I was very progressive and took my switchblade out and cut my shoestrings which allowed me to run faster after that damn bus"!

I know, this did nothing to help you. But it may have helped the butt-head that could actually relate to this.

that was awesome!!!!!!!!!!

[dialog_gvf]

Originally Posted by Phatferd

My TV has the option to turn this off or on. I don't really know what it means. I think it has to do with how the TV takes a signal smaller than 1080p and recreates it into a 1080p signal.

Which option should I choose for my TV? On or off?

What is your TV model?

I suspect the setting is a bit of misnomer. A set either displays interlaced or it doesn't. It can't switch (at least nothing short of multiscan monitors can, as far as I know). So, I expect the setting has something to do with how it de-interlaces.

If your set is a panel, I expect it means the difference between using the 540p field and scaling it, or trying to combine fields into a frame (2:3 or 2:2 pull-down, for film and video sources).

Things can get complicated with true interlace sources, since there can be interfield motion (motion between fields) and to de-interlace that requires you to be able to detect and eliminate the motion changes between fields (motion-adaptive de-interlacing). Some do it by dropping fields that exhibit motion (back to 540p with upscaling), and the very best will find the portion of the frame that has motion and drop and scale only those portions.

Gary

[Edh63]

Originally Posted by dialog_gvf

What is your TV model?

I suspect the setting is a bit of misnomer. A set either displays interlaced or it doesn't. It can't switch (at least nothing short of multiscan monitors can, as far as I know). So, I expect the setting has something to do with how it de-interlaces.

If your set is a panel, I expect it means the difference between using the 540p field and scaling it, or trying to combine fields into a frame (2:3 or 2:2 pull-down, for film and video sources).

Things can get complicated with true interlace sources, since there can be interfield motion (motion between fields) and to de-interlace that requires you to be able to detect and eliminate the motion changes between fields (motion-adaptive de-interlacing). Some do it by dropping fields that exhibit motion (back to 540p with upscaling), and the very best will find the portion of the frame that has motion and drop and scale only those portions.

Gary

I thought my explanation was a little less confusing.

[mastertang]

This cnet article is pretty straightforward about 1080i vs 1080p.
http://reviews.cnet.com/4520-6449-6361600-1.html
1080 is better than 1080i, but 1080i does not have only 540 lines of resolution. Imho the is a just slight difference between the two.

[Phatferd]

Thanks for all of your input, but I don't think I asked the question correctly (my bad).

I have a 1080p TV. In the video settings it has an option that says deinterlacing "on" or "off". I just want to know what I should have that set to?

[Edh63]

Originally Posted by Phatferd

Thanks for all of your input, but I don't think I asked the question correctly (my bad).

I have a 1080p TV. In the video settings it has an option that says deinterlacing "on" or "off". I just want to know what I should have that set to?

Hey man, I was just being a smart ass. I wasn't implying anything here. I hope I didn't offend you. I just got a hair up my butt. Shouldn't the manual for your TV give some direction on your question?

[ThisIsSparta]

Originally Posted by Phatferd

My TV has the option to turn this off or on. I don't really know what it means. I think it has to do with how the TV takes a signal smaller than 1080p and recreates it into a 1080p signal.

Which option should I choose for my TV? On or off?

A native 1080p TV will always display in 1080p no matter what signal you send to it, so if you send it a 1080i signal from a broadcast HD signal it will scale it to 1080p resolution and to a progressive scan. Side-note, a 1080p has the 1080 horizontal lines to fully display a 1080i signal where as a 720p doesn't. So if you are watching something broadcasting in 1080i on a 720p you are down-scaling the signal (losing quality).

[Big Daddy]

Read this article. It has the best explanation of interlaced versus progressive. It also has many useful pictures.

http://www.hometheaterhifi.com/volum...e-10-2000.html

[FallenAngel78]

Nice to know that no one has really answered the question as to whether or not it should be on or off. I mean there has been a lot of great technical information given about progressive vs interlaced but not whether it should be set to on/off. I am just paying attention now to find out how long it takes to actually answer the question.

Originally Posted by Edh63

The "i" stands for "interlace". Here let me use that in a sentence for you.

"I was trying to tie my shoes the other day and my shoestrings became interlaced, so I missed the bus".

The "P" stands for "Progressive". Again, allow me to use that in a sentence for you.

"Since my shoestrings became interlaced and I missed the bus, I was very progressive and took my switchblade out and cut my shoestrings which allowed me to run faster after that damn bus"!

I know, this did nothing to help you. But it may have helped the butt-head that could actually relate to this.

Now that was one of the best posts I have evern seen!

[Big Daddy]

Originally Posted by FallenAngel78

Nice to know that no one has really answered the question as to whether or not it should be on or off. I mean there has been a lot of great technical information given about progressive vs interlaced but not whether it should be set to on/off. I am just paying attention now to find out how long it takes to actually answer the question.

If you had bothered to read the article in the link that I included, you would have realized that the question is answered in the article.

The answer to the question depends on the type of TV. If the TV has a better deinterlacer than the DVD player, leave it on. However, if the TV is an older digital TV or is a low quality TV, leave the deinterlacer of the TV to off and let the DVD player do the deinterlacing. In most cases, I would let the receiver or the DVD player to do the deinterlacing.

Here is a quote from the article:

“Until fairly recently, progressive-capable televisions tended to have relatively inexpensive and mediocre deinterlacing chips that had no film mode (no 3:2 pulldown detection), or a film mode that didn't work very well. But nearly all progressive DVD players, certainly almost all the ones we review here, have a deinterlacer with a film mode. However, as deinterlacing technology has gotten better and cheaper, film-mode deinterlacers have been integrated more and more into high-end televisions. At this point, essentially all the major manufacturers make HDTVs with a working film-mode deinterlacer.

Why is a film mode deinterlacer so good? Because when it correctly detects film sources, it can recreate the original film frame with no compromises at all. The result is that when watching film-originated DVDs, you will get far less line twitter on thin horizontal and near-horizontal lines, you will keep full resolution on camera pans and zooms, and you will see less noise on high-detail areas. To see this effect, look at thin lines in the background, especially on slow camera movement. Look at high-detail areas of the picture, like trees and bushes, again especially on slow camera moves. Once you see how sharp and clear those areas look with good film-mode deinterlacing, you won’t want to go back.

If you don’t really see any difference, then perhaps your TV has a better deinterlacer than most, and includes a film mode. Then you will see very subtle differences, perhaps no difference at all, switching between progressive and interlaced output on your DVD player. The deinterlacer in the TV may be pretty good, perhaps just as good as the one in the DVD player.

So why bother with a progressive player if your TV has a film-mode deinterlacer? First off, as we said, the deinterlacers in DVD players tend to be somewhat better than the ones in TVs. When we compare the deinterlacing in a mass-market DVD player to the deinterlacing in a TV from the same company, usually the DVD player wins. The ones in DVD players tend to stay in film mode more consistently, drop to video mode less often, and handle bad edits more cleanly. Obviously there are exceptions. For example, in our second shootout, we tested a Pioneer Elite HDTV and found that it had better deinterlacing than any of their (Pioneer's) players.

Even in cases where the TV has a better deinterlacer than the player, though, the progressive player has an advantage: better resolution. When the television deinterlaces the analog signal, it first has to digitize the signal (A/D), send it through a deinterlacing chip, and convert it back to analog to feed to the CRTs. That process inevitably loses some resolution. It might not be much. You might feel like you can live with it. But it would be a good idea to get a copy of the Avia DVD and look at the resolution pattern on it to see exactly how much you are losing. About 5 TVL (TV Lines) of loss is good performance, 10 is average, and 15 or more is bad. With the progressive DVD player, you should be able to get all 540 TVL. But if your TV has a good film-mode deinterlacer, and you feel like you can live with the resolution loss, then you might be able to save money by keeping your existing interlaced player.”

[FallenAngel78]

Originally Posted by Big Daddy

If you had bothered to read the article in the link that I included, you would have realized that the question is answered in the article.”

What I said is that no one really answered it. Anyone can post a link to a lengthy technical article that contains the information somewhere within it. I read the article and I did appreciate all the information. But I was referring to the fact that all someone had to do is say that the settings depend on the TV and then possibly follow that up with the brief synopsis that you then provided.

[john_1958]

Originally Posted by Phatferd

My TV has the option to turn this off or on. I don't really know what it means. I think it has to do with how the TV takes a signal smaller than 1080p and recreates it into a 1080p signal.

Which option should I choose for my TV? On or off?

http://www.dvguru.com/2007/01/30/ful...deinterlacing/
http://www.pcmag.com/encyclopedia_te...i=41088,00.asp
http://www.hqv.com/technology/index1/deinterlacing.cfm
try it

I use it in powerdvd

[Toptube]

turn it on for interlaced sources that aren't being upscaled and or de-interlaced externally by a player of some sort. (PS2, standard cable, xbox, old dvd player)

turn it off for sources that are either already progressive (HD stuff like HD cable, Blu-ray) and also leave it off for things thar are being upscaled and/or de-interlaced externally (dvd in an upscaling player, PS2 games in a PS3, dvd in a 480p player).