[mythtv] Patch to autodetect 4:3 Zoom aspect ratio

Justin luitjens at cs.utah.edu
Fri Feb 29 05:54:13 UTC 2008

This would likely work as long as you know where the cut offs should 
be.  If not what happens if the screen has a few black lines at the 
bottom because it is a dark part of the scene?   One thing that would 
help prevent this would be to look over a couple frames and not a single 
frame.   Or what if the TV icon goes over into the black bars?


Chris Pinkham wrote:
> * On Thu Feb 28, 2008 at 10:59:54AM -0700, Justin wrote:
>> What is the edge detection algorithm you are using?  Moving to a more 
>> sophisticated algorithm could prevent false detections.
> I haven't looked at his code, but what more is required other than "all lines
> above this are black, the next is not" and vice versa for the bottom bar.
> That's what I did in the commercial flagging code does to detect the letter
> and pillar boxes.  In order to make things faster, the commercial flagger
> doesn't check every pixel, but enough to be accurate.  A screen of thin
> vertical lines might make it past the detection, but that's a fringe case.
> --
> Chris
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