[vlc-devel] Re: [PATCH] Sharpen video_filter

Sigmund Augdal Helberg dnumgis at videolan.org
Sun Feb 4 21:07:27 CET 2007

On 2/4/07, Jean-Baptiste Kempf <jb at videolan.org> wrote:
> On Sun, Feb 04, 2007, xxcv wrote :
> > I think a reasonable sigma default value should be .05
> euh... Why not. I have no idea of it.

Indeed the default value looked much too high..

> I tried sharpen on a HD video clip and indeed its choppy :)
> So I need to improve a bit more the code ?

I thought the idea of HD was that the video should be sharp? And, if the
unsharpness comes from camera focus the filter will be less effective as it
works on a fixed amount of pixels (3x3). For HD I'd say this
filters will only be usable to enhance allready sharp edges.

> How efficient is sharpen when using it on interlaced vs progressive HD
> > video clip ?
> No idea.

You _definitly_ want to deinterlace the video first. Most likely event
then the filter will enhance
the deinterlacing artefacts.


> Jean-Baptiste Kempf
> http://www.jbkempf.com/
> --
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