Creative COW SIGN IN :: SPONSORS :: ABOUT US :: CONTACT US
HDV FORMAT: HDV Format ForumTutorialsApple FCP ForumAdobe Premiere Pro ForumSony Vegas Forum

Cineframe 30/Cineframe 25 resolution loss vs. 60i

Cow Forums : HDV Format
VIEW POSTS   •   ADD A NEW POST   •   SEARCH   •   CHANGE FORUM
Respond to this post   •   Return to posts index   •   Read entire thread


Cineframe 30/Cineframe 25 resolution loss vs. 60i
by Barry Green on Dec 20, 2004 at 7:46:05 pm

I know there has been lots of speculation about CineFrame 30 and how it may employ a "smart" de-interlacer that would only cause resolution loss in areas of motion, and no resolution loss in static areas.

Unfortunately, it isn't so. I've extracted the resolution sections from a CamAlign chart, shot both in 60i and CF30. The CF30 shows substantial resolution loss, and this is coming off a completely locked-down still shot. Looks like there's no smart de-interlacing going on.

Interestingly, Steve Mullen had hypothesized that due to row-pair summation and low-pass filters, the FX1 should deliver an "effective" 820 lines of resolution, and that seems to have been a pretty darn good guess. In this chart I'd say that it cleanly resolves at 700, and things get a little blurred together at about 750, so for a guess of 820 that's *very* close.

In interlaced mode the 1080i of the HDV delivers about 750 lines of resolution. In CF30 mode it drops to about maybe 575. Which is close enough to say that CF30 is pretty much a straight frame-drop de-interlace.

For the pictures, one is a 300% blow-up in Photoshop that demonstrates the convergence of lines on the resolution portion of the chart.
[img]http://www.icexpo.com/FX1-60i-vs-CF30-res.jpg[/img]

For those who want to examine the raw extraction from the camera, here's a bitmap extraction of the uncompressed frames from the .m2t (no CineForm intermediary codec):
[img]http://www.icexpo.com/FX1-60i-vs-CF30.BMP[/img]


-----------------
The DVX Book and DVX DVD are now available! See http://www.dvxuser.com/articles/dvxbook/


Respond to this post   •   Return to posts index   •   Read entire thread


Current Message Thread:




Note: If you are a registered user please click here to login before posting.

Your post will not be accepted if your name and email address are not registered in our database. Click here if you do not have an account.

Name
E-Mail Address
Subject
E-Mail me when someone responds
Just This Message   Entire Thread   None  

Message:



Note: The following are HTML characters and may cause parts of your post to disappear if not used correctly: < > &
To include any portion of the post in your response, highlight the desired text and hit the "Q" key. Read more...



Add your message signature


 


Note: By clicking "Post Direct" button above, you are agreeing to the Creative Cow's Code of Conduct.



FORUMSTUTORIALSMAGAZINETRAININGVIDEOS - REELSPODCASTSEVENTSSERVICESNEWSLETTERNEWSBLOGS

© CreativeCOW.net All rights are reserved.

[Top]