apertus° IRC logs

2016/10/07

Timezone: UTC

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se6astian|away

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Bertl_zZ

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07:01

Bertl

morning folks!

07:03

comradekingu

morning, on this day we must attain a lower position

07:28

aombk2

what does this mean?

07:59

Bertl

probably that all the higher positions are already gone :)

08:00

comradekingu

gotta get down on friday

08:00

comradekingu

pardon the pun, pardon the pun

08:04

aombk2

i dont understand, friday is basement maintenance day?

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philCeee

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philCeee

hey folks..

08:19

philCeee

thanks for the answers - sorry for my "just dropping in once a day" visits

08:20

philCeee

currently no time for office

08:20

philCeee

and irc logs are so comfortable

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philCeee

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se6astian

no worries :)

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Bertl

off for now ... bbl

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Bertl

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circ-user-1QZIk

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circ-user-1QZIk

changed nick to: philgrande|phill

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philgrande|phill

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kgugala|away

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philgrandeC

i am gone - bye

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niemand

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13:27

niemand

heyho, here sebastian (lww/bba/c3w)

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Bertl_oO

hey

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Bertl_oO

changed nick to: Bertl

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13:27

Bertl

how's going?

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13:28

niemand

currently not working with it, but was quite straight forward :)

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13:29

Bertl

good to hear!

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13:29

Bertl

so I take it, that it will work for your purpose?

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13:29

niemand

for testing, i know what I need to do

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13:30

Bertl

okay, great!

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13:31

niemand

for production we need e.g. white balance

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13:33

Bertl

there are several lookup tables which can be used to adjust the live HDMI feed

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13:34

Bertl

there is no 3D lut available at the moment, but we haven't had any problems with the linear LUTs plus matrix yet

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13:34

Bertl

but there is also no dedicated software (yet) to do the magic

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13:36

niemand

Is this the "automate HDMI calibration" item on the TODO list here: https://wiki.apertus.org/index.php/Factory_Calibration#TODO

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13:38

niemand

so there's no software to apply LUTs to an hdmi output?

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13:39

Bertl

there is software to configure the LUTs but there is no software to 'guess' LUTs from 'desired' outputs

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13:39

niemand

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13:39

Bertl

https://wiki.apertus.org/index.php/Axiom_Alpha_Software#Image_Pipeline

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13:40

Bertl

this is the image pipeline, which is basically the same for Alpha and Beta (except for the final HDMI side)

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13:40

Bertl

so first, there are the linearization LUTs (for sensor correction) and the FPN correction

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13:40

Bertl

then it goes to memory (what you get if you do a snapshot)

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13:41

Bertl

this data is then mapped via a 4x4+4 color matrix (you can configure that as you like)

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comradekingu

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13:42

Bertl

and modified by 4 linear LUTs to handle gamma and whatnot

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13:42

Bertl

the HDMI encoder part is missing in the Beta, as we directly output HDMI there

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13:43

Bertl

so currently the 'look' for the HDMI output is controlled by the matrix and the gamma LUTs

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13:43

Bertl

(note that the gamma LUTs do not need to be gamma related, they can be anything working on a single channel)

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13:44

Bertl

so if you want to do white balance, the best way is to take a snap, calculate a transformation (matrix + LUTs) and upload that to the FPGA

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13:45

niemand

are there docs for this?

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13:45

Bertl

note that you can take snaps during live view, so it even can be semi-automated

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13:45

Bertl

@docs: not yet, but help is welcome :)

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13:45

niemand

I can test it^^

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13:46

Bertl

the wiki page I linked describes the pipeline and the math as well as the tools

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13:47

Bertl

there are a bunch of (shell) scripts which set the registers

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13:47

Bertl

but that can also be done via python or C

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Bertl

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Topic

apertusÂ° - open source cinema | www.apertus.org | join the apertusÂ° Lab: http://lab.apertus.org/ | IRC Logs available at: http://irc.apertus.org

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22:33

Bertl_oO

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

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#apertus IRC Channel Logs

2016/10/07

Timezone: UTC