[MPlayer-dev-eng] watermark removal

[Michael Niedermayer]

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 ...

btw, see http://mountains.ece.umn.edu/~guille/inpainting.htm

[...]

Michael