[mythtv] [PATCH]Black border filter

[Buechler, Mark R]

Do you know if this has been applied yet? I'm eager to give it a go.. 

-----Original Message-----
From: Cedric Tefft [mailto:cedric at phreaker.net] 
Sent: Wednesday, September 01, 2004 5:24 AM
To: Development of mythtv
Subject: Re: [mythtv] [PATCH]Black border filter

Kristof Pelckmans wrote:

>Here is an implementation for an automatic aspect ratio detection filter.
>
>Kristof
>
>  
>
Sounds like a good idea.   Unfortunately, I wasn't able to get it do to 
anything.  I was somewhat confused by the explanation of the parameters...

>III. How to use
>
>example :
>blackborder=0:70:76:430:18:20,blackborder=0:40:46:490:18:20
>
>The first filter detects a 16:9 video stream in a 4:3 capture stream 
>and the second is for a 14:9 video stream in a 4:3 capture stream.
>
>The different parameters :
>1) 0 for horizontal, 1 for vertical (not implemented)
>2) start line
>3) end line
>4) 'black' pixel threshold : all pixels below this threshold will be 
>considered as black
>5) 'black' line threshold : minimum number of black pixels that have to 
>be present to consider a line 'black'
>
>  
>

There are six parameters in the example, but only five are described, so
after start line, I'm kinda guessing...  Could you maybe clarify which
parameter is missing from your explanation and what it's for?

w/rt what the 'black pixel threshold' parameter:  This could use some
clarification.  What's the context?  What's the range?  For example, is this
an integer from 0 to 100, and if so, what does 0 mean, and what does 100
mean?

w/rt the 'black line threshold', wouldn't it be better to express this as a
percentage rather than a pixel count?  By using a fixed number of pixels,
you're tuning the filter for use with one particular horizontal resolution,
whereas if you use a percentage, the filter adapts itself automatically to
the resolution of the source material.

- Cedric




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