[mythtv] [PATCH]Black border filter
cedric at phreaker.net
Wed Sep 1 05:24:12 EDT 2004
Kristof Pelckmans wrote:
>Here is an implementation for an automatic aspect ratio detection filter.
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
>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.
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