[sane-devel] "gamma" and "bayer" ? What are they?

[Peter Fales]

Try taking a picture of solid red, green, and blue images.  (As close
to pure saturated colors as you can get).  How does that affect the resulting
data?

-- 
Peter Fales			  Lucent Technologies, Room 1C-436
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On Thu, Jun 12, 2003 at 11:14:27AM -0500, Theodore Kilgore wrote:
> 
> 
> On Thu, 12 Jun 2003, Peter Fales wrote:
> 
> > > Maybe your data is also compressed? Or it's transferred as a jpeg?
> >
> > For a toy camera like this, it's most likely the raw output of the CCD
> > device and needs a fair amount of processing of the raw pixel data.
> 
> Actually, I suspect it is a CMOS chip. The camera really is cheap.
> 
> > The
> > dc25 backend shows an example of this kind of processing.  (It's not likely
> > that you'll be able to use that kind - just an example of that type of
> > processing.)
> >
> > My guess is that the most effective technique would be to open up the camera
> > and try to identify the manufacturer of the CCD.
> 
> And how would I do that identification if there is nothing written on
> said chip? Since I have already destroyed one of these things trying to
> look inside, I would be glad to look in it again (can't kill it twice,
> after all) if it would really help.
> 
> And anyway the USB vendor:product number is 0x2770:0x9120, which tells us
> that the chip is from SQ Technologies ( website at www.sq.com.tw ) and
> they do claim to make video capture chips. They make an SQ905 and an SQ913
> in particular. I suspect the one in this camera is the SQ905 (there is no
> 912) They have publicly available "data sheets" which are nothing but
> glossy sales brochures.
> 
> Then see if you can get
> > anything from them.
> 
> Good idea. They don't answer my e-mail.
> 
> 
> I think that's how the dc-25 algorithms were
> > originally developed (not by me!)
> >
> Hmmm. I will have a look.
> 
> Thanks.
> 
> Ted Kilgore
> 
> 
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