1080i dvd players

Discussion in 'Playback Devices' started by ishak, Mar 30, 2004.

  1. ishak

    ishak Auditioning

    Joined:
    Jan 26, 2004
    Messages:
    14
    Likes Received:
    0
    Trophy Points:
    0
    does a dvd have to be mastered in high definition to upscale to 1080i.
     
  2. NickSo

    NickSo Producer

    Joined:
    Jul 2, 2000
    Messages:
    4,260
    Likes Received:
    0
    Trophy Points:
    0
    Real Name:
    Nick So
    Nope... thats the point of UPSCALING... it SCALES UP a 480i image to HD resolutions.
     
  3. Bernie_A

    Bernie_A Stunt Coordinator

    Joined:
    Feb 3, 2004
    Messages:
    112
    Likes Received:
    0
    Trophy Points:
    0
    Hope you don't mind me piggy backing onto your thread, but what's the problem with mastering the disk at 1080i to begin with? Will we ever see that so it's a true HD picture?
     
  4. ishak

    ishak Auditioning

    Joined:
    Jan 26, 2004
    Messages:
    14
    Likes Received:
    0
    Trophy Points:
    0
    so can any dvd be upscaled to 1080i
     
  5. Jay Blair

    Jay Blair Second Unit

    Joined:
    Nov 3, 2001
    Messages:
    333
    Likes Received:
    0
    Trophy Points:
    0
    Yes, any DVD, any VHS tape, any laserdisc, any video can be scaled to 1080i, or 1080p for that matter.

    However, scaling a DVD to 1080i does not turn it into HD resolution. Upscaling will usually make the 480i DVD look better, but it still doesn't look like HD.
     
  6. Bernie_A

    Bernie_A Stunt Coordinator

    Joined:
    Feb 3, 2004
    Messages:
    112
    Likes Received:
    0
    Trophy Points:
    0
    So for now, it's virtual HD....
     
  7. Don_Berg

    Don_Berg Supporting Actor

    Joined:
    May 30, 2003
    Messages:
    931
    Likes Received:
    0
    Trophy Points:
    0
    Yes its virtual HD, nowhere near real HD quality. I prefer a quality 480p DVD player since the source on the current DVD format is limited to 720x480 resolution. You have to wait a few years before a new HD-DVD format will be available with any significant titles and cost.
     
  8. Allan Jayne

    Allan Jayne Cinematographer

    Joined:
    Nov 1, 1998
    Messages:
    2,404
    Likes Received:
    0
    Trophy Points:
    0
    What the 1080i DVD player should do is:

    (2) De-interlace the 480i from its MPEG decoder into 480p. (All DVD players have (1) MPEG decode the data on the disk into 480i.)

    (3) Scale up the 480p into 540p.

    (4) Fit the 540p into a 1080i signal format wise (a no-brainer) while the content remains 480 lines of resolution vertically and 720 max pixels across horizontally.

    Some HDTV sets display only in 1080i. They will perform steps (3) and (4) for you for progressive DVD player feeds and will perform (2), (3), and (4) for interlaced DVD player feeds.

    So the main advantage of a 1080i DVD player is if it can do steps (3) and (4) better than your TV. In addition you need to be concerned about whether the player does (2) better than your TV.

    Video hints:
    http://members.aol.com/ajaynejr/video.htm
     
  9. Don_Berg

    Don_Berg Supporting Actor

    Joined:
    May 30, 2003
    Messages:
    931
    Likes Received:
    0
    Trophy Points:
    0
    I would say a 1080i upconverter shouldn't de-interlace at all, just scale each 720x240 field up to 1920x540, don't add de-interlacing artifacts.
     
  10. Gil Jawetz

    Gil Jawetz Stunt Coordinator

    Joined:
    Sep 14, 1999
    Messages:
    95
    Likes Received:
    0
    Trophy Points:
    0
    Hmmm... I've been thinking about getting the new Zenith 1080i player for my Zenith C32V37 but I don't know if it'll have a significant impact. Obviously there's no way to know until it comes out.
     
  11. Allan Jayne

    Allan Jayne Cinematographer

    Joined:
    Nov 1, 1998
    Messages:
    2,404
    Likes Received:
    0
    Trophy Points:
    0
    >>> I would say a 1080i upconverter shouldn't de-interlace at all, just scale each 720x240 field up to 1920x540, don't add de-interlacing artifacts...

    Not as good. This softens the picture.

    If you go directly from 720x240 up to 1920x540 you might get something like this in the finished 1080i. Two examples are shown, on the left is a straight repetition of scan lines with even and odd 1080i fields shown slightly staggered, and on the far right uses blending, also with even and odd fields shown slightly staggered in the diagram. Note particularly that the odd 1080i field could be made only of odd original lines and the even 1080i field could be made of only even original lines. Since simply doubling the scan lines gets to 480 but we need to ultimately get to 540, a few more scan lines need to be repeated every now and then and they are shown around where original scan line 4 is found.

    1 .................. 1
    . 2 ...................... 2
    1 .................. 1&3
    . 2 ...................... 2&4
    3 .................. 3
    . 4 ...................... 4
    3 .................. 3&5
    . 4 ...................... 4&6
    3 .................. 3&5
    . 4 ...................... 4&6
    5 .................. 5
    . 6 ...................... 6
    5 .................. 5&7
    . 6 ...................... 6&8
    7 .................. 7
    . 8 ...................... 8
    7 .................. 7&9
    . 8 ...................... 8&10


    Whereas by de=interlacing first we could get something like this after scaling to 1080i, again with no blending on the left and with blending on the far right. Again, to get from 480 to 540 a few extra scan lines need to be duplicated after the de-interlacing is complete and this is shown around where original scan line 4 is found and again around original scan line 9.


    1 .................. 1
    . 1 ...................... 1&2
    2 .................. 2
    . 2 ...................... 2&3
    3 .................. 3
    . 3 ...................... 3&4
    4 .................. 4
    . 4 ...................... 4
    4 .................. 4&5
    . 5 ...................... 5
    5 .................. 5&6
    . 6 ...................... 6
    6 .................. 6&7
    . 7 ...................... 7
    7 .................. 7&8
    . 8 ...................... 8
    8 .................. 8&9
    . 9 ...................... 9
    9 .................. 9
    . 9 ...................... 9&10


    Here the scan lines are never out of order.
     

Share This Page