[libdv-dev] RE: horrible frames

[Arne S. <ar...@sc...>]

The mjpeg project has a decent de-interlacer. I wrote a brief article on 
this software on my website ( 
http://www.schirmacher.de/arne/dvgrab/index_e.html ), but I did not mention 
the de-interlacing functions.

My understanding of the interlacing in DV is that every frame in DV is 
actually two interleaved video frames where every other row has been 
omitted. So a non-interlaced frame could be made by taking every other row 
and duplicating it in two consecutive rows (to retain the w/h ratio) into 
the destination buffer.

I would like to have such a function in the libdv code. I could easily 
duplicate it in the Kino code, but if interlacing is a feature of DV, then 
libdv should have code to de-interlace it.

I am not an mpeg expert at all, but I think that the mpeg code would 
compress de-interlaced frames better than interlaced ones, because the 
latter have more rough looking features which do not compress that good. 
But this is just a guess.

Also, when saving a single frame the de-interlaced image would look much 
better. Maybe the two half frames can even be processed and overlaid with 
some existing image processing library.

Arne
-----Original Message-----
From:	David Bonneville
Sent:	Monday, May 21, 2001 2:35 PM
To:	lib...@li...; lin...@li...
Subject:	horrible frames

Hi all,

I have some problems when I use Frame::ExtractRGB() (dvgrab's code). I got
some interlaced frames as you can see at 
http://www.idiap.ch/~bonnevil/images

Do you have/know this problem ?

I am  also trying to use Frame::ExtractYUV() but it seems that I've not 
find
the correct format yet. If somebody know it or has ever used it before,
please tell me what to do.

Thanks

David

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