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View Full Version : Removing blueish interference lines


kingmob
9th September 2004, 16:31
I've been using the search a lot, but nothing seems to really make a difference. I've been trying out capturing TV-broadcasts lately. White noise reduction seems to be going very well, but i also have some diagonal colored lines (blue and yellow, but the blue ones are more noticable), which i assume are from interference somewhere in the capture process. The lines do not move, so they're not like the white lines you sometimes get.
I've supplied a screenshot here (http://hal9000.fttd-s.tudelft.nl/sjoerd/bands.png).

Now theoreticly this kind of noise should be very easy to detect. The problem is however, that all my knowledge is just that, theoretic, so i have no clue as how to write it. In my search i focussed on solving this problem through a fourier transform, but maybe someone knows another way, which is available, unlike the FT way.

ps. I also tried peachsmoother and guavacomb, but both yielded no results.

Mug Funky
9th September 2004, 16:52
nothing even with peach and stuff? the lines mustn't move all that much then.

hmmm.... you could always rearrange your TV antenna. that will help to some degree.

you NTSC or PAL?

Boulder
9th September 2004, 17:16
The Netherlands == PAL.

kingmob
9th September 2004, 17:18
The lines are completely static and peach did not seem to do anything at all about them.
The capture is simply done through a pinnacle tv card. The source is PAL.
Not that i'm expecting much from this 5 year or so old card, but i figured such noise should be easy to remove.

scharfis_brain
9th September 2004, 19:14
check for the VD_WnR() script, that uses the Wavelet Noise Reducer for Virtualdub.

kingmob
10th September 2004, 13:34
I've been looking for it, but i cannot find it. I have a .avsi where the filter is defined, but i donot have the virtualdub filter itself, so it's kinda worthless.