Thomas,
A few questions in the text below.
On Thu, 5 Mar 2009, Thomas Kaiser wrote:
Hello Theodore
kilgota@xxxxxxxxxxxxxxxxxxxxxx wrote:
On Wed, 4 Mar 2009, Thomas Kaiser wrote:
As to the actual contents of the header, as you describe things,
0. Do you have any idea how to account for the discrepancy between
From usb snoop.
FF FF 00 FF 96 64 xx 00 xx xx xx xx xx xx 00 00
and
In Linux the header looks like this:
FF FF 00 FF 96 64 xx 00 xx xx xx xx xx xx F0 00
(I am referring to the 00 00 as opposed to F0 00)? Or could this have
happened somehow just because these were not two identical sessions?
In case I did not answer this one, I suspect it was probably different
sessions. I can think of no other explanation which makes sense to me.
Doesn't remember what the differences was. The first is from Windoz
(usbsnoop) and the second is from Linux.
1. xx: don't know but value is changing between 0x00 to 0x07
as I said, this signifies the image format, qua compression algorithm in
use, or if 00 then no compression.
On the PAC207, the compression can be controlled with a register called
"Compression Balance size". So, I guess, depending on the value set in the
register this value in the header will show what compression level is set.
One of my questions:
Just how does it work to set the "Compression Balance size"? Is this some
kind of special command sequence? Are we able to set this to whatever we
want?
2. xx: this is the actual pixel clock
So there is a control setting for this?
Yes, in the PAC207, register 2. (12 MHz divided by the value set).
3. xx: this is changing according light conditions from 0x03 (dark) to
0xfc (bright) (center)
4. xx: this is changing according light conditions from 0x03 (dark) to
0xfc (bright) (edge)
5. xx: set value "Digital Gain of Red"
6. xx: set value "Digital Gain of Green"
7. xx: set value "Digital Gain of Blue"
Varying some old questions: Precisely what is meant by the value of
"Digital Gain for XX" where XX is one of Red, Green, or Blue? On what
scale is this measured? Is is some kind of standardized scale? Or is it
something which is camera-specific? Also what is does "set" mean in this
context? This last in view of the fact that this is data which the camera
provides for our presumed information, not something which we are sending
to the camera?
Theodore Kilgore
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