Re: HDV camcorder with 720p

May I also suggest that you download some Sony HDV samples from the Internet
and see how one (or several) look after they are displayed on your computer
display. I gotta tell you that all of the HDV material I have seen from the
Sony and Canon HDV cameras when displayed on computer monitors looks
wonderful, and vastly superior to standard definition DV video, despite the
interlace issue you voice concern about.

Smarty


"J. Clarke" <jclarke.usenet@xxxxxxxxxxxxxxxx> wrote in message
news:eabb930p88@xxxxxxxxxxxxxxxxxxxx
Johan Stäck wrote:

David McCall skrev:

I'm not sure what you mean by fix the interlacing.
Interlace is fixed by deinterlacing which in effect means that you try
to undo the damage that has been done.

True, using CPU power and some cunning programming you can recover
decent looking frames.
Simple line-doubling will do wonders, but you will of course discard
half of your video information.


Computers are fast enough these days, that the computer should
be able to handle interlacing as it is intended to be displayed.
Presumably you mean "be able to handle deinterlacing"?
Yes, todays computers can surely handle it, but why should they have to?

For me the choice is simple:
-If your main intended display equipment is interlaced (as for example
normal household TV sets), then you should shoot interlaced.
-If you main intended display equipment is progressive (as for example
computer screens) you should shoot progressive.

(Question: are todays "HD ready" LCD TV:s really using interlace? Or is
it only the CRT TV:s that use it?)

My applications allow the user to freeze on single frames. In such
cases, interlaced does you no good.

Capturing each field as a full frame would greatly increase
the amount of overhead needed to keep up.
Why and how?

Not everything is a "major feature film" where you have a
properly trained cinematographer that understands the
limitations of shooting at low frame rates like 24P or even 30P.

If you just shoot the way most people video, it will look like
total crap. Having the higher effective frame rate that interlace
provides makes shooting video much easier. It make fast
moving animation easier too, and you don't have to put a
ton of motion blur on it to make it look smooth.
Probably very true.

However, what I try to make is specialized instructional stuff where
interlace really is a pain.

Either I deinterlace (I do it now on my DV material), or get a camera
that does it right from the beginning. Such cameras exist, but are
expensive. Hopefully, they will come down in price.

Making the transition from DV to HDV, I was hoping to leave interlace
behind me for good, but perhaps I am being over-optimistic!....

Before you spend a lot of bucks on a camera, you might want to get a cheap
HD tuner board, grab an hour of CSI:Miami or something OTA in 1080i, and
play with it. It may be that you find that 1080p is not really necessary
for what you are doing or you may find that 0180i is a total showstopper.
But either way you'll _know_.

--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)


.

Relevant Pages

  • Re: Why interlaced HDTV?
    ... >To display such a signal with the whole picture changing 50 times per second ... which is why interlace has been used by all broadcasters since the ... >Updating only one field's worth of the picture, or half the number of picture ... which is why there is a move to 1080p/720p 50 FRAME ...
    (uk.tech.digital-tv)
  • Re: HDV camcorder with 720p
    ... your computer display. ... I gotta tell you that all of the HDV material I ... along with the clean still frame capability that he says he needs. ...
    (rec.video.desktop)
  • Re: Why interlaced HDTV?
    ... A progressive display can be configured to display interlaced material perfectly correctly. ... That particular trade-off results in 50Hz flicker, but no worse than on a conventional interlaced CRT. ... However there is a third trade-off which maintains the flicker elimination of these screens. ... You can display interlaced images on a progressive screen correctly, and I suspect that the reason it isn't done has more to do with manufacturers agendas than a limitation of interlace per se. ...
    (uk.tech.digital-tv)
  • Re: 1080i or 720p
    ... display causes information to be lost forever. ... I'm talking about any content that has been converted for interlace display or captured with an interlaced camera. ... it was converted to or captured as interlaced and information that a progressive capture would have had is *not* recaptured by de-interlacing. ... A careful reading of that source shows nothing to support your theory that information lost during the capture of or conversion to interlaced format can be recovered by de-interlacers. ...
    (alt.tv.tech.hdtv)
  • Re: Upconverting question
    ... It is more of a concern how the interlace is performed and what ... The big advantage I see in all the new formats in DTV is alternatives to ... Then a 24 fps video stream could be upscanned to 48 fps or 72 fps ... need for the content source to dictate the actual display rate. ...
    (alt.tv.tech.hdtv)