esby
12th November 2003, 03:46
Let me explain...
I'm putting this topic to this thread because i don't know how to call that exactly.
That's a problem happening, at least, with some japanese R2 anime dvd (ntsc),
I know the problem is happening with hunter X hunter dvd,
I think it exists for flame of recca dvd too.
There might be other titles affected,
but what interest me here, is detecting the 'bad' frames before or after ivtc...
(Depending the encoding method choosen)
The problem appears oftenly at scene change, but can happends
without one too.
It start by some grey/black lines in the bottom of the picture,
as if the film was burned out there during a few frames.
After there can be a completely black frame.
And after the next image (after the scene change) is getting corrupted with some grey-white lines in upper of the picture
and is slightly stretched too.
After a few frames, the quality goes back to normal,
until the next scenechange :devil:...
Check http://www.chez.com/esbyphp/samples/index.php
to have a look on the samples and understand what i tried to explain shortly.
Back to the problem:
How to detect it automatically?
I thought of analysing the bottom & top of each frame,
looking for a blackened area (working in luminance probably).
Maybe associated with a local scene change detection in a 8 pixels bars (bottom or top) vs the neighbouring one or global one.
If anyone has ideas on how to detect that...
esby
I'm putting this topic to this thread because i don't know how to call that exactly.
That's a problem happening, at least, with some japanese R2 anime dvd (ntsc),
I know the problem is happening with hunter X hunter dvd,
I think it exists for flame of recca dvd too.
There might be other titles affected,
but what interest me here, is detecting the 'bad' frames before or after ivtc...
(Depending the encoding method choosen)
The problem appears oftenly at scene change, but can happends
without one too.
It start by some grey/black lines in the bottom of the picture,
as if the film was burned out there during a few frames.
After there can be a completely black frame.
And after the next image (after the scene change) is getting corrupted with some grey-white lines in upper of the picture
and is slightly stretched too.
After a few frames, the quality goes back to normal,
until the next scenechange :devil:...
Check http://www.chez.com/esbyphp/samples/index.php
to have a look on the samples and understand what i tried to explain shortly.
Back to the problem:
How to detect it automatically?
I thought of analysing the bottom & top of each frame,
looking for a blackened area (working in luminance probably).
Maybe associated with a local scene change detection in a 8 pixels bars (bottom or top) vs the neighbouring one or global one.
If anyone has ideas on how to detect that...
esby