No, it wasn't the wireless keryboard.

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 way 
to do that, due to my rather low level of practice.

Best regards.

Mark Heath wrote:
> I've split this image into it's Y-U-V channels,
> 
> There appears to be no noise in the chroma channels only the Luma  
> channel.
> 
> This could be due to:
> 
> * the chroma channels being half resolution, not enough resolution to  
> represent the noise pattern. (below the nyquist value)
> * the interference frequency is not high enough to cause colour shifts.
> 
> Or due to JPEG compression.
> 
> * notice that the noise falls cleanly within Macroblock boundaries.
> * the noise may be falling below the quantizable threshold in those  
> areas.  Thus not being encoded into the Macroblock.
> 
> If you get to capture the image again, maybe do it at a very high  
> bitrate, so we don't see compression artifacts.
> 
> I have seen this type of noise before, even recorded onto a digibeta  
> provided by Universal, but never looked into methods of removing it.
> 
> Have you tried a bit of trial and error, to see if the noise goes away?
> 
> * Turn off all electrical appliances.
> 
> * Try the capture source closer to the computer.
> 
> Mark
> 
> --
> Check out my latest YUV tools at http://silicontrip.net/~mark/lavtools/
> 
> On 08/03/2008, at 8:34 AM, Andrea Giuliano wrote:
> 
>> Okay, you and Burkhard suspect radio interference. But you have not  
>> seen
>> the full pictures I sent to Bernhard Praschinger. In those picture you
>> could see that the pattern is not spread all over the frame: the  
>> trunks
>> of the trees, and the rocks too, are only affected very little, if  
>> even
>> not at all. Could an interference affect some colors and not other?  
>> I'm
>> not expert of interference, nor of colors, indeed?
>>
>> So here is a link to one of those frames:
>>
>> http://www.webalice.it/sarkiaponius/00000669.jpg
>>
>> It's just 54K big. If you zoom around the trunks or the rocks you will
>> surely understand what I'm trying to say (sorry, my native language is
>> neapolitan, not english...)
> 
> 
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-- 
Andrea

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