Hi Andrea,
Since you mention that your camcorder, with the 1.2m S-Video cable, produces the same pattern, it is unlikely to be a source of external interference.
However you did mention you changed something recently inside your computer? This change could be causing the interference. Inside computer cases are horrible places to put any sort of analogue signal.
I'm not sure if it's possible, try moving the card to another computer. I'm not sure if it's a software bug
On 10/03/2008, at 2:39 AM, Andrea Giuliano wrote:
By the way, Mark, can you explain to me how did you split the image into YUV's channels? It's very interesting for me, but I could not find a wayto do that, due to my rather low level of practice.
As for YUV channels. MPEG and JPEG file use YUV to store their colour information.This allows for chroma subsampling, since our eyes are not as perceptive spatially to colour, as we are to brightness.
All the tools that this mailing list is based around operate in the YUV colour space.
Displaying this information in a meaningful way is another story however.
For viewing, Photoshop's L-a-b colour mode is similar, I'm not quite sure if it's exactly the same but if you want to get a visual idea about the image it's pretty good.
I wouldn't see that it would be difficult to write a yuvtool to copy the chroma channels into the luma and show the video image this way. Maybe include it in a set of video tools to display more engineering information about a yuv stream...
It wouldn't be hard to do, just need some motivation! :-) Is anyone interested in such a tool? Mark -- View my latest yuvtools at http://silicontrip.net/~mark/lavtools/
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