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In Reply to: Aliasing phenomenon? posted by dgavrile on May 16, 2001 at 07:00:03:
Yes, this is an artifact of interlaced video (combining the odd and even lined screens) and/or 3:2 pulldown for film. What can you do?1) get a progressive output player (still does interlacing but it is done at the digital level and less prone to artifacts);
2) get a good quality doubler or scaler (Faroujda is what I use but they are expensive);
3) ??? not sure other possibilities -- maybe use a computer-based system for your dvd player since it'll work as pure progressive -- recent SGHT issues have talked about this a lot.
Follow Ups:
Chris,Thanks. Just for my clarification:
1) Is it the progressive output player a special one, I think all Hi-Fi DVDs should have this functionality. Isn't it?
2) I knew about this, but this applies only to projectors not to TV screens. Am I right ? Also I think that this is not enough, I am able to see the phenomenon with this functionality enabled (for example Davis projectors have built-in). I know it's expensive but how much is the Faroujda and does it worth in your opinion?
3) Can I find "SGHT issues" on the Internet?All the best,
Daniel
Sorry to delay in responding but I've been travelling.All players are progressive at one point internally and then interlaced at another from what I've read. The progressive players take the interlaced image and deinterlace it digitally and this is the real appeal of them (contrasted with the Faroudja that does it by taking an analog signal and dealing with the integration step). As far as I know, there isn't any purely "progressive" dvd player out there because of hardware limitations imposed by the manufacturers. I'm not sure about using a PC as a dvd player and how this issue is handled, but I suspect it is the same. Again, the advantage of the progressive player is that it deals with things all digitally and this is a much easier way to handle deinterlacing.
Is the Faroudja worth it? Depends on your set-up in my view. I have a Sony g70 projector (8") and use the Faroudja 2200 and I'm very pleased by the results. If you are using a LCD or DLP and want to consider a Faroudja, then you might look at their new one that is specifically set at the factory to match your projector (and it shaves off a little cost compared with the 2200). If you have a 9" crt, then you really need a better scaler/quadrupler (DWIN transcanner is said to be good, and the Faroudja 3000 and above series are incredible...quality AND expense).
good luck.
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