VideoHelp Forum

Our website is made possible by displaying online advertisements to our visitors. Consider supporting us by disable your adblocker or Try ConvertXtoDVD and convert all your movies to DVD. Free trial ! :)
+ Reply to Thread
Results 1 to 14 of 14
Thread
  1. I have a source where I am noticing what looks like halo's, but it's not against the lines like usual. Almost as if its a double image of some kind.

    Whats up with this and can I get rid of them?

    Screenshots

    https://i.imgur.com/ngzgdjy.png
    https://i.imgur.com/Sk4gxZz.png
    https://i.imgur.com/iiw3ei1.png
    https://i.imgur.com/NaAGvtD.png
    Quote Quote  
  2. Looks like post-ringing (common for IIR filters) - perhaps something is wrong in analog domain? Cable connection? Or poor resizer? Probably best idea is to deconvolve (in luminance plane) - would try to: perform edge detection (Laplacian, Sobel, Canny?), remove all except ringing, invert luma channel, combine both (perhaps with some weight). Eventually blur everything except edges.
    Quote Quote  
  3. It's raw playback video from a DVD, there are no cables involved, and it has not been filtered in the screenshots.

    I have no idea how I would go about doing all of what you just suggested using avisynth.
    Quote Quote  
  4. Member
    Join Date
    Aug 2017
    Location
    United States
    Search PM
    Avisynth has a filter called finedehalo that will alleviate some of that.
    Quote Quote  
  5. Unfortunately dehalo filters are not removing it for me. I have tried multiple of them. It barely reduces it, but really softens the picture in the process. Dehaloing was actually the first thing I tried in order to get rid of it before I even asked on here.
    Quote Quote  
  6. Member
    Join Date
    Aug 2017
    Location
    United States
    Search PM
    In that case, check out this thread at doom9: https://forum.doom9.org/showthread.php?t=140623
    Quote Quote  
  7. Member
    Join Date
    Aug 2010
    Location
    San Francisco, California
    Search PM
    That's a ringing artifact and it looks like a DVD production error to me. It's typical of composite output from a U-matic videocassette deck.
    Quote Quote  
  8. Originally Posted by killerteengohan View Post
    It's raw playback video from a DVD, there are no cables involved, and it has not been filtered in the screenshots.

    I have no idea how I would go about doing all of what you just suggested using avisynth.
    Extract Y, perform edge detection (http://avisynth.nl/index.php/GeneralConvolution), subtract real edge to left only ringing, invert ringing and blend with source to nullify ringing without affecting real edge (mask may be helpful). Your goal is to perform inverted process to one that created ringing...
    Quote Quote  
  9. Member
    Join Date
    Aug 2017
    Location
    United States
    Search PM
    Originally Posted by pandy View Post
    Originally Posted by killerteengohan View Post
    It's raw playback video from a DVD, there are no cables involved, and it has not been filtered in the screenshots.

    I have no idea how I would go about doing all of what you just suggested using avisynth.
    Extract Y, perform edge detection (http://avisynth.nl/index.php/GeneralConvolution), subtract real edge to left only ringing, invert ringing and blend with source to nullify ringing without affecting real edge (mask may be helpful). Your goal is to perform inverted process to one that created ringing...
    I hate to say it, but your theoreticals aren't really helping. Telling someone what to do without them knowing how is pointless. Do you have even a pseudo-script?
    Quote Quote  
  10. Originally Posted by SaurusX View Post
    I hate to say it, but your theoreticals aren't really helping. Telling someone what to do without them knowing how is pointless. Do you have even a pseudo-script?
    Then sorry - i've made wrong assumption.
    Quote Quote  
  11. side note: sharing a small sample (of the source) which shows the problem instead of just some screenshots might motivate folks to share more than general theoretic approaches,...
    users currently on my ignore list: deadrats, Stears555
    Quote Quote  
  12. I just remembered I had a source with this kind of problem several years ago and it was the first and only other time time I ever seen it. I went looking for the thread I asked about it in and this is what was suggested to me.

    https://forum.videohelp.com/threads/366394-Video-showing-weird-double-imaging-lines

    It seems to help quite a bit, but a lot of things gets softened and or smudged out. I still cant get it to work with src in it, but it works without it.
    Quote Quote  
  13. Member
    Join Date
    Aug 2017
    Location
    United States
    Search PM
    Originally Posted by killerteengohan View Post
    It seems to help quite a bit, but a lot of things gets softened and or smudged out. I still cant get it to work with src in it, but it works without it.
    "src" is just a variable that you're declaring right after your source (src) filter. Something like this:

    MPEG2SOURCE(...)
    src=last
    Quote Quote  
  14. Member
    Join Date
    Aug 2010
    Location
    San Francisco, California
    Search PM
    Originally Posted by SaurusX View Post
    Originally Posted by pandy View Post
    Originally Posted by killerteengohan View Post
    It's raw playback video from a DVD, there are no cables involved, and it has not been filtered in the screenshots.

    I have no idea how I would go about doing all of what you just suggested using avisynth.
    Extract Y, perform edge detection (http://avisynth.nl/index.php/GeneralConvolution), subtract real edge to left only ringing, invert ringing and blend with source to nullify ringing without affecting real edge (mask may be helpful). Your goal is to perform inverted process to one that created ringing...
    I hate to say it, but your theoreticals aren't really helping. Telling someone what to do without them knowing how is pointless. Do you have even a pseudo-script?
    A smart and motivated user will click the link, read about convolution, then search for such things as "subtract," "invert," "blend," and "mask." Some of us just don't work for free unless we find the problem especially intriguing.
    Quote Quote  



Similar Threads