Daniel Bush wrote:
[email protected] wrote:
I've a file taken with a mobile phone.
The detail is execrable.
It's important to identify a couple of faces in the file.
I've asked around. The best I have is to go through the file, select a
critical frame, download it and use The Gimp to sharpen a given face.
First off, can this be done?
I haven't tried loading video files into gimp (I'm assuming you mean
some sort of video file right?).
I know that you can convert frames to pictures using mplayer:
mplayer video_file -vo png -ss 1:00:00 -endpos 4
This will approximately play from 1hr to 1:00:04 and capture the
frames as png images in the current directory (I haven't actually
tested it so you might need to add the compression option in (-vo
png:z=0 etc). There's also jpeg which has more options in my version
of mplayer.
You may need to check which -vo's are supported:
mplayer -vo help
I think you can also apply filters on the video using -vf including
unsharp mask:
mplayer -vf help
A random example:
mplayer video_file -vo png -vf unsharp=l7x7:1.5 -ss 1:00:00 -endpos
4
See the man page for mplayer.
Other ways of sharpening the resulting images might include: getting
gimp to batch process them (haven't done this); or using imagemagick's
'convert' to sharpen the images using something like the -sharpen
option in a simple shell script.
Once you have the images (i'd try bmp to preserve as much detail as you can)
If there isn't alot of motion you could try stacking the images (adding
the frames togther)
Its a bit like taking a long exposure with a camera, you can get a
brighter/clearer image.
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