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| 11:20 | Bertl | morning folks!
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| 11:42 | se6astian | hello!
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| 14:56 | intracube | hello :)
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| 15:22 | intracube | any new news from apertusland?
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| 16:25 | Bertl | nothing worth mentioning on my side ...
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| 16:33 | intracube | hi Bertl
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| 16:33 | intracube | I was wondering how many prototypes/betas have been made so far
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| 16:42 | Bertl | about 20
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| 16:50 | intracube | ah ok
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| 17:38 | se6astian | 18 I counted
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| 17:41 | intracube | and what's the current state of the sensor calibration/colour?
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| 17:45 | intracube | is the processing still all done 'off-camera'?
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| 17:51 | se6astian | some steps are already possible to do camera internally
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| 17:51 | se6astian | FPN calibration for the FPGA for example
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| 17:52 | se6astian | camera captures 64 darkframes, raw2dng inside camera averages them, adjust levels and the output profile is loaded into memory for compensation by the FPGA
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| 17:52 | se6astian | the process takes a few minutes
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| 18:05 | intracube | is the FPN fairly static for a given chip?
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| 18:05 | intracube | so the process would only have to be done occasionally (or during initial calibration)
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| 18:06 | intracube | I remember reading there were issues around different gain settings for the CMV chip requiring different FPN correction
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| 18:07 | Bertl | off for now ... bbl
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| 18:07 | Bertl | changed nick to: bertl_oO
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| 18:23 | alexML | intracube: you know this page, right? https://wiki.apertus.org/index.php/Pattern_Noise
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| 18:24 | alexML | the static part is easy to remove; the problem is the dynamic row noise component, which is still an issue (although a very large part of it can be corrected using the black reference columns)
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| 18:24 | alexML | but this part is currently done in post, and the black column data is not yet recorded on HDMI
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| 18:25 | alexML | so, it only works best on raw12 stills
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| 18:26 | intracube | alexML: qute a lot of the dynamic row noise was caused by an early power supply design iirc?
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| 18:27 | intracube | and yep, I read through those docs a while back :)
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| 18:29 | alexML | possible, I'm not aware of power supply changes related to this issue (but didn't really follow the hardware side)
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| 18:29 | alexML | a while ago we found a possible connection between fan rotation and row noise (on top of what's on the wiki)
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| 18:30 | intracube | think it Bertl mentioned a change to the power supply design some months back and that it reduced row noise
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| 18:30 | alexML | have a link?
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| 18:31 | intracube | no - I'll see if a search brings up anything
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| 18:31 | intracube | alexML: https://www.apertus.org/axiom-beta-hello-world-article-may-2015
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| 18:32 | intracube | "image sensor support and power supply circuit design are clearly visible in the images. The dynamic row noise is barely noticeable anymore compared to the first AXIOM Alpha test images. "
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| 18:33 | intracube | looks like this pre-dates your work, so it's not relevant
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| 18:33 | alexML | ah, thought it's a recent improvement on the beta hardware
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| 18:33 | intracube | didn't realise it was quite so long ago o.o
| | 18:37 | intracube | fans are PWM controlled, I guess?
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| 18:37 | intracube | choppy output might be to blame for the noise
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| 18:38 | intracube | it's a problem for sensitive rf applications
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| 18:44 | intracube | installed some 1000Hz PWM controlled LED lights in his parents kitchen
| | 18:44 | intracube | then the kitchen radio stopped working. oops.
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