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| tomis |
| Posted: Apr 8 2011, 04:21 PM |
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Newbie
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Posts: 2
Member No.: 30699
Joined: 8-April 11
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I have old vhs tapes I am capturing and the videohas horizontal white streaks flying from right to left. I tried a few temporal denoise filters but I can't seem to figure out the right parameters.
Any help appreciated.
thanks
ts
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| BugsBunny |
| Posted: Apr 8 2011, 08:49 PM |
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Member
Group: Members
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Joined: 28-December 07
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The horizontal rain can be caused by old & worn video heads. An exchange of the video head drum can be a good idea.
You could try another VHS deck.
If you want good quality a decent VHS deck may pay off. It's hard to filter a bad output of a worn VHS deck.
Also you could try to capture the video multiple times and then do a median of these captures.
I've posted a avisynth script here that works with 4 captures of the same video and does a median and then an averaging:
http://www.digitalfaq.com/forum/14930-post30.html
It can get rid of dopouts that appear on one playback but not on the other (eg tracking errors). It also reduces playback noise.
Dropouts that are on the tape (caused by errors of the tape) cannot be removed by the script. |
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| tomis |
| Posted: Apr 9 2011, 03:02 PM |
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Newbie
Group: Members
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Member No.: 30699
Joined: 8-April 11
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Thanks for the quick reply, I'll try doing 4 captures, although that will bring my project to a crawl.
Indeed the tapes are old 20+ years, VHS SECAM. The deck is as good as it can get (samsung worldwide), it is not easy to find a vhs secam deck in the US these days.
I was thinking there must be a way to detect one horizontal set of 25 white pixels in a non white surrounding and blend them or lock them from the previous frame. Each frame exhibits 2 to 5 such white artifacts. |
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| BugsBunny |
| Posted: Apr 10 2011, 07:42 PM |
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Member
Group: Members
Posts: 29
Member No.: 22708
Joined: 28-December 07
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Manually cleaning the video head drum and other parts can help to reduce the dropouts as well.
Take a look here:
http://translate.google.com/translate?hl=e...er.html&prev=_t
Don't use these VHS cleaning tapes.
I think there are some avisynth filters that may be able to filter the dropouts. Look for filters from Fizick or V. C. Mohan. |
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