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#apertus IRC Channel Logs

2014/01/15

Timezone: UTC


00:01
FergusL
back here Bertl ?
00:11
Bertl
kind of around, what's up?
00:13
FergusL
don't remember what I wanted to ask...
00:13
Bertl
well, next time don't ask to ask, just ask ... I'll answer when I read up on it :)
00:13
FergusL
ha yes, just to check, are we using 16 LVDS channels, not 32 ? I'm sorry if that crucially misses context
00:14
Bertl
we are using 32, 16 on each side
00:14
FergusL
Good
00:14
FergusL
wanted to check the value I get are correct
00:15
FergusL
and... thanks !
00:15
FergusL
and you, what's up ?
00:17
Bertl
currently fixing my UPS
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01:04
Bertl
off to bed now .. have a good one everyone!
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S3bastian
good morning
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14:28
Topic
apertus° - open source cinema | www.apertus.org | Currently Hot: Axiom Alpha Development http://axiom.apertus.org/ | IRC Logs available at: http://irc.apertus.org
14:28
se6astian
has set the topic
14:29
Bertl
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15:01
S3bastian
time to go home
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17:47
gcolburn
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17:47
gcolburn
hello
17:58
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18:18
se6astian
hi Gabe!
18:19
gcolburn
hi!
18:19
gcolburn
just created a new matrix with one of the images you took last week
18:19
gcolburn
sorry its taken me a bit to get around to it
18:19
gcolburn
the average error was 10.9%
18:21
gcolburn
and that's with all the FPN still in the images. I bet once we correct that the average error goes down
18:21
gcolburn
so I think the new charts you captured did make an improvement
18:26
se6astian
thats great!
18:27
gcolburn
what are the main tasks being worked on right now?
18:27
gcolburn
streaming to hdmi and noise reduction?
18:28
se6astian
I work on researching/reverse engineering what some sensor registers do
18:28
se6astian
and making interaction with the camera easier
18:28
se6astian
like I created a web based GUI running on the camera
18:28
gcolburn
oh cool
18:29
gcolburn
are you referring to registers that aren't documented?
18:29
se6astian
Herbert is working on the nois reduction atm AFAIC
18:29
se6astian
yes
18:29
gcolburn
interesting
18:29
gcolburn
what interesting registers features have you found?
18:29
se6astian
cmosis told us for example that on-sensor coloumn and pixel FPN correction can be turned off
18:29
se6astian
https://wiki.apertus.org/index.php?title=CMV12000#Register_122
18:30
gcolburn
ah. very cool
18:31
gcolburn
I noticed the Truesense CMOS sensors had that, so I wondered about the CMV12000
18:32
gcolburn
have you tried captures with it yet?
18:32
se6astian
yes, see https://wiki.apertus.org/index.php?title=CMV12000#Register_122
18:32
se6astian
its not documented anywhere in the datasheet
18:34
gcolburn
okay. I didn't fully understand the setup for the shot in that histogram, so I wasn't sure how it translated into visible image quality
18:34
se6astian
its a moderately lit white wall
18:34
se6astian
dark green shows the "normal" image
18:35
se6astian
then the other colors show the same image with coloum based FPN turned off, with pixel based FPN turned off or with both options turned off
18:36
gcolburn
wow, quite the histogram difference
18:37
gcolburn
so has the column an pixel FPN reduction been on by default in all our previous captures?
18:37
se6astian
yes
18:39
Bertl
well, unless the histogram was not updated, it shows a sensor defect/problem not the real situation
18:40
Bertl
s/was not/was/
18:41
Bertl
on the raws there is unusual noise in a certain bank (looks like LVDS training problems, but the test image is transmitted perfectly)
18:42
Bertl
so I wouldn't jump to conclusions yet
18:42
gcolburn
okay
18:42
gcolburn
it'll be nice when eventually the FPN is substantially less :)
18:47
se6astian
how are your current efforts with FPN correction going Bertl?
18:50
Bertl
slowly :)
18:51
Bertl
haven't had too much time to spend on, but I have a few ideas
19:17
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19:31
guesst
Bertl: what about hot pixels? do you solve them / detect at runtime?
19:35
Bertl
interestingly we do not seem to have that many, so it would make sense to store them with the FPN correction
19:35
Bertl
dynamic detection/compensation would be an option but ATM I do not see a good reason for doing that
19:35
guesst
can you tell they are not solved on chip? have you compared the test/final sensor?
19:39
Bertl
interestingly, as we found out recently, the chip does/can do some internal column/row compensation, but cmosis doesn't like to share information easily
19:40
guesst
how?
19:41
Bertl
how we found out or how it works?
19:41
guesst
yes
19:41
Bertl
well, we found out in discussion with cmosis, and we don't know how it works (yet)
20:22
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21:15
Bertl
off for a nap .. bbl
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[1]se6astian
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21:27
se6astian
good night!
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