[MPlayer-dev-eng] watermark removal

[Jindrich Makovicka]

Michael Niedermayer wrote:

>Hi
>
>On Sunday 03 November 2002 22:50, D Richard Felker III wrote:
>  
>
>>I'm working on a watermark removal filter to get rid of those pesky
>>semi-transparent watermarks that appear on some movies (especially
>>stuff recorded from tv and/or released by lame encoding groups).
>>However, I can't seem to figure out quite how to make it work. My
>>first idea was based on capturing an otherwise all-black frame from
>>the movie with just the watermark showing, then having the filter use
>>that for removing the watermark, but things seem to be a bit more
>>complicated. I can't seem to figure out how the watermarks are
>>typically applied -- it doesn't seem to be simple addition or
>>averaging, so maybe it's some sort of weighted average. Any ideas? The
>>movie I'm experimented on was apparently watermarked with some stupid
>>virtualdub filter, so perhaps someone knows how that functions...
>>    
>>
>RTFS of virtualdub & filters ;), no i dunno how its added but imho the problem 
>might be that mpeg compression causes errors and so even if the removial 
>equation is correct it cant be removed ...
>
here's a logo removal filter for VD, with source:

http://shelob.mordor.net/dgraft/delogo/delogo.html

>
>btw, see http://mountains.ece.umn.edu/~guille/inpainting.htm
>
>[...]
>
>Michael
>  
>
-- 
Jindrich Makovicka