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Old 21st October 2011, 17:18   #55  |  Link
sven_x
Registered User
 
Join Date: Oct 2011
Location: Germany
Posts: 39
@johnmeyer
Opening your source screenshot in Photoshop, selecting the inner image area and displaying a histogramm shows, that the image possibly has undergone a levels adjustment. The levels of the inner area lay in the range 0 ... 255 (well, deepest luma is a bit higher), so that searching for a minium might not land in the border area. After a levels adjustment the borders are not in a deeper black.



Nevertheless in one case the script produced also a bad result with my own recordings. That was recorded from TV with a very cheap PAL VHS recorder.

Last edited by sven_x; 21st October 2011 at 17:41.
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