#apertus IRC Channel Logs

are we having a meeting today?

did the faire end, se6astian ?

it did

meeting in 2 hours

How was the faire se6astian?

https://twitter.com/ApertusOSCinema/status/999667252071927808

https://twitter.com/ApertusOSCinema/status/999963161007738880

https://twitter.com/ApertusOSCinema/status/999928179254087680

https://twitter.com/ApertusOSCinema/status/1000779061214445568

Hi

yes

hi g3gg0

hi!

hi

hola

so like last time please pm me now if you want to report/share/discuss a topic/progress and I will make a list so everyone can speak after another

we attended maker faire in berlin

so lots of kids roaming around

lots of people interested in the camera - the SMT workshop was again in high demand - a normal but successful maker faire I would say :)

The pictures are amazing!

haha..great

Hehe nice

xD

all of the trio was betas?

one of them will become your remote development camera soon

So, after my finals finished that was on 23 May I started working on writing code that Bertl gave me

I read more about mapping and then finally on 25 May uploaded my code on my github .Here -> https://github.com/nmdis1999/Code-To-Map-Framebuffer

I asked about it here but since this week pretty much everyone was busy it is still pending. (Hope I can resolve it today)

Previously, I had written histogram tool from scratch (in which I am still keen on improving the quality of code).

So, I am trying to get another approach which should be ready to be presented within 2-3 days.

That's all :)

about the remote beta, can you ssh to it without a password prompt?

or in other words, when you got the credentials and key set up did you connect successfully yet?

I can also access root directory but it seems while copying file there is an issue

lets see if we can debug it afterwards, or maybe bertl is back by then already

yeah, that sounds good. I'm online tonight

afetr going through the pipeline I decided the placement of my kernel in the output part of the pipeline that receives data from the FIFO buffer connected with the AXI reader (from the DDR) in bursts

this week, I started with the design of the line buffer module that stores the stream of pixels (3 lines) so as to fetch appropriate data for 2D convolution, bilinear demosaic an hence focus peaking. I will be submitting my line buffer code for review by the end of this week and side by side start working on the convilution (sobel) kernel !

great, thanks!

perfect

sounds good

supragya ?

This week, I was looking at the methods by which PLR could be integrated in mlv stream

The last discussion we had se6astian was quite good on this

and I had a few thoughts on it that I would like to discuss.

As an update for others, this week, I was working on https://lab.apertus.org/T1018

So, that should be up in a while... also, the emulation is to be changed to emulate on HDD this week

that's all from me this week

ok if there isnt anything else for today I would say we conclude

k

and start diving into the 2 pending things: itis remote camera ssh/scp access -> I guess Bertl is best to help sort that out

btw, is znc thing sorted out?

are others using it too?

I was succesful in changing my setting using link provided by Bertl

but for some reason I am having trouble setting it up with Polari

se6astian: last week, we discussed on two things... gamma and PLR. The slopes you showed me made sense... however we should begin by gamma values this time and how should they work

nmdis1999_: once nmdis1999 is setup, no one else could use that nick

znc is setup, but you are just not able to access it... still znc is connected to freenode

great

where you could show me how gamma compresses the bits

This is about normal gamma curves?

Bertl, in case it helps to see what my terminal is responding to scp command https://imgur.com/a/hqWKrXA

the gamma value defines the curve: http://xahlee.info/img/what_is_gamma_correction.html

Here is another interesting article

nmdis1999_: it is asking you for a password so either you secured your public key with a password or you are not using the public key you gave me and we tested with

Bertl: is iti supposed to connect from the zbox to the beta or directly to the beta through the tunnel?

supragya: is it this: https://en.wikipedia.org/wiki/Gamma_correction? <- yes

note that gamma correction by itself does not necessarily alter/reduce the bitdepth, but its often done at the same time

Okay

I will have more to discuss when I dig a bit deeper into this

a bit :)

these are all marketing terms

"log" means logarithmic

also camera manufacturers are not sharing the exact shape of their "log C", "hyper gamma", "Cine-gamma" curves

what ever that means

as they dont document any of this we can only guess

or a new block is to be introduced?

doesn't canon camera need such gamma values to be stored as part of mlv?

yes it is..

IIRC from our chat last time MLV does not store any gamma related information

in raw files?

ymc98_1: you around?

supragya: currently the MLV data is linear, no gamma needed in Canons

but it can be a feature of the viewfinder itself not the camera

look up table

hmm, sure

too much information for today already? :)

do we know what's up with ArunM?

never heard from him since

supragya: no worries, lets do it one step after the other, lots of new technical terms and relations

ping me on irc when you want to continue this topic in depth

sometimes I fire it up and don't get the logs

so irc.apertus.org is still my goto place

well, not something I can recall at the moment

when it happens next... I will send a pic

for example your buffer size is set to '50'

and 'Auto Clear Chan Buffer' is on

I may do it later.. is it on webinterface?

okay thanks

have a good night then!

Good night everyone

Good night

Hello Bertl

haven't checked it yet (we were on the Maker Faire) but I was hoping for a brief report what you've been doing

spi interface and row buffer is done

"(19:48:04) supragya: se6astian: btw, are you not tired after the faire?" He's working nights.

ArunM: have you spent some though on the necessary side channel yet?

didn't get it, side channel?

OOHh i think you meant "thoughts on side channel"

:)

Anyways, if you wish, I can still report my progress last week

Basically, last week I solved the issue with DNG patterns I had in OpenCine and I finished Bilinear Debayering, Linear Debayering and Green Edge Directed Interpolation, which had great and noticeable results

which answered my email and helped me a lot. He is also open for any further questions so it was a great experience

and that's all, folks!

instead of a separate interface i am thinking of programming "Do not change" registers for controlling the emulation, using the already programmed spi interface only

I'm not convinced this is a great idea, because for example we dump the registers as metadata and this might lead to some confusion ... nevertheless, it would be an option

probably mostly configuration information to select and modify artificial pattern

or do we need some real time data

might be an option and the temperature register (read only) would be a good candidate for such a selection/switch

this way we can build it with one (mux register) or two (separate) SPI interfaces

i'll consult you on any other option if i come across any