#apertus IRC Channel Logs

that would be a very useful script

off to bed now ... have a good one everyone!

so anuejn and I started looking into the sensor calibration stuff aswell, especially motivated by the working hdmi raw setup, because that means we can capture a huge amount of darkframes, etc in a short amount of time.

one thing we noticed is, that the darkframes seem show some gradient in the x direction

so it should not be stray light getting in

(for example this is 256 darkframes at 4x gain, 11ms exposure averaged and the colormap goes from μ - 3σ to μ + 3σ: https://files.niemo.de/4x_11ms_mean.png)

and for 4x gain the histogram is even weirder, having two plateaus: https://files.niemo.de/4x_hist.png

maybe we can use these to better compensate the row noise...

will create issue on github first to keep track of the relevant information

Bertl_zZ: which register is the frame counter in the generator block?

but its great that you are now getting to the bottom of things in this regard

morning folks!

se6astian: see https://wiki.apertus.org/index.php/CMV12000_Register_Blocks (scan generator, second read only register)

http://vserver.13thfloor.at/Stuff/AXIOM/BETA/HDMIRAW/cmv_hdmi3_raw.bit

0x80000004 RO [27:16] Scan Frame Counter is the one we want I assume

many thanks

how does this register correlate with scn_reg call from commandline?

I would suggest to have the top-left and bottom-right with 0xF000 while the top-right and bottom-left use the 0xF800

axiom_scn_regi is the correct cal here I assume?

yep, looks good

I updated https://github.com/apertus-open-source-cinema/axiom-firmware/issues/196

so the exposure time has to be within the proper limits

off for now ... bbl

se6astian: so re the darkframes, when anuejn pushes his local changes it would be pretty interesting to capture some darkframes from as many different sensors as possible, to look into these patterns and see if this is just random or actually present on multiple sensors. How many sensors do we currently have available?

it doesn't really take a lot of time, I think we did a pretty comprehensive scan of 12 different exposure values + 4 gains in ~30 minutes

(~120Gb uncompressed)

also Bertl_oO: how difficult would it be to always have the dark columns transmitted, even when not capturing the full sensor resolution?

well I can offer 1 sensor

maybe Bertl as well

just color/mono/nir

and called it V2

regading black coloumns, we can do 2048x1080 via hdmi

so probably no relevant revisions, thats nice to know

as there might be legit reasons for not wanting the full width probably

nice :)

the one liner is:

so

for time in 1; do cargo run --release -- WebcamInput --device 0 ! DualFrameRawDecoder --first-red-x true --first-red-y false ! RawBlobWriter --number-of-frames 256 --path target/darkframe_2x_$(ssh operator@192.168.0.95 "echo $time > /axiom-api/devices/cmv12000/computed/exposure_time_ms/value; cat /axiom-api/devices/cmv12000/computed/exposure_time_ms/value").blob; done

3d printed new recorder enclosure

the recorder has been assembled, and miraculously everything seems to fit now with the connectors and bulky cables

nice