interlaced vs progressive
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if you subscribe to a cable or satellite TV service chances are theres a toggle somewhere on your set-top box that allows you to switch between 720p or 1080i but youve also probably noticed that most TVs and monitors advertise themselves as 1080p these days which doesnt match up with either of those so what gives you see that P you always see at the end of 1080 P stands for progressive and no Im not talking about the insurance company or Bernie Sanders Im talking about progressive scan which means it will draw all of the lines in a single frame of video sequentially so that each frame contains a complete image that fills the screen by contrast the little I stands for interlaced in which only every other line of an image is displayed in one frame interlaced signals are common not only for 1920 by 1080 TV channels but they were also dominant back in the day of analog television where almost everyone was watching at 480i or 576i on CRT displays but why wouldnt it be more straightforward to display one whole image per frame well
part of the reason was bandwidth you see only so much data can be flung over the airwaves or a coaxial cable at once interlaced video saves on bandwidth by only sending half of a complete frame at once this allowed older TV sets to refresh more frequently for smoother motion as they could show 60 half frames per second instead of 30 full frames but modern LCD flat panel TVs only support progressive scanning so how do they work then with interlaced 1080i signals provided by cable or satellite TV services well the signals have to be what is called D interlaced this can be done by either the set-top box or the T itself but either way its an imperfect science you see the two halves of a fully interlaced frame are at two halves of the exact same image rather they are usually delivered as the halves of two separate slightly different frames so when you put them together they dont look quite perfect and on low-quality displays this can show up as whats called combing in places where the two half frames dont match up very
well tvs use processing tricks to help avoid really bad artifacting in D interlaced video and generally it works fairly well on displays that are worth their salt and although many cable boxes can also delay signals its typically a better idea to let your TV do it as cable boxes are all too often made by the lowest bidder and the deinterlacing logic inside them wont be as good as what your TV offers but even with a nicer TV it can still be possible to notice a reduction in picture quality when theres rapid movement on-screen such as if youre watching a sporting event because two half frames in sequence during something like a hockey game can be way out of sync due to the fast motion of the players many sports networks like ESPN have actually chosen to broadcast in 720p instead of 1080i sacrificing resolution for better movement but come on Linus this is 2016 why do we have to sacrifice anything well due to the cost of upgrading systems as well as the fact that most bourgeoisie viewers seem to be content with 1080i service
we probably wont see real 1080p at 60 frames per second over cable and satellite anytime soon however the good news is that computers have no problem outputting 1080p signals so if youre one of the many folks who are constantly using their rigs for everything from gaming to watching Netflix in HD or even 4k you wont have to worry about interlacing artifacts yet another reason to join the PC master-race just make sure that you dont have to give up a kidney to your satellite provider in order to get out of your contract tunnel Bayer VPN lets you tunnel to 20 different countries allowing you to browse the Internet and use online services as though you are in that a for mentioned different country they have easy-to-use apps for iOS Android PC and Mac theyve also got a Chrome extension and all you do like seriously my family could do it which is like a serious endorsement is click the button the little switch moves to on then whatever country it is that you pick boom your connection gets encrypted and the public IP address that you
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