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#apertus IRC Channel Logs

2019/03/25

Timezone: UTC


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05:32
Bertl
off to bed now ... have a good one everyone!
05:32
Bertl
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BAndiT1983|away
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06:59
parimal
Hey BAndiT1983, did you go through my code?
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BAndiT1983
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Bertl_zZ
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Bertl
morning folks!
14:01
anuejn
morning :)
14:06
siddhantsahu
Bertl: Good Morning!
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parimal
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Bertl
off for a bit ... bbs
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Bertl
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BAndiT1983|away
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17:03
siddhantsahu
Hey BAndiT1983, regarding T1142 for OpenCine we need to write c++ modules for different white balancing algorithms but will the same modules work of AXIOM Beta as well? If not, then what we need to do?
17:04
BAndiT1983
hi siddhantsahu
17:05
BAndiT1983
why should this module work on the camera with limited hardware?
17:17
siddhantsahu
Since AXIOM Beta acquires RAW images, white point can be set afterwards in post(OpenCine) but it might help when we want to preview the footage in a monitor. AXIOM Beta users can manually dial in the illuminant temperature but they can also have option to choose to automatic set white point by the camera using these algorithms.
17:19
BAndiT1983
this can be done by LUT
17:19
siddhantsahu
Yes
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Bertl_oO
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Alan_
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17:50
Alan_
Hi , I have a doubt about the task T734 what would be the register output we will work on ?
17:51
Bertl
what is your doubt?
17:51
Alan_
Will it be bayers pattern , first row RGRG... And second GBGB... And so on
17:52
Alan_
Or will it be something different ?
17:52
Bertl
currently the memory layout is a little more complex but similar to bayer pattern
17:53
Bertl
i.e. you will get 64bit words consisting of four channel RG/GB of 12bit data plus 16bit overlay
17:53
Alan_
As I saw somwhere it uses an array of RGGBRGGB....
17:53
Bertl
the RG is from the first bayer pattern line and the GB is from the second bayer pattern line
17:53
aman__
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17:54
BAndiT1983
https://www.researchgate.net/figure/Typical-Bayer-Matrix-with-3-main-colors-in-the-RGGB-configuration-In-this-paper-each_fig1_45709080
17:59
Alan_
So , why we are working with bayer patter in task ?
18:00
BAndiT1983
why not?
18:00
Alan_
As it is mentioned that you will run it on beta .
18:01
BAndiT1983
yes?
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Alan_
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18:07
Alan_
And we have to Optimize our algorithm and code to reduce memory access.
18:07
Alan_
Whicj also includes selection of right variable size.
18:07
Alan_
Which*
18:08
BAndiT1983
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18:08
Alan_
And if i will be working with bayer pattern rather than actual register output , thongs thongs will be different.
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18:16
Bertl
well, memory access is done by the ARM cores
18:17
Bertl
so it is advantageous to utilize the cpu caches for this wile avoiding unnecessary hits on the DDR memory
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Alan_
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18:41
Alan_
So , for task should we write code using dev/mem or simple mapping raw12 file which will be having bayers pattern ?
18:45
Bertl
which task?
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18:46
Bertl
for T734 you want to work with the framebuffer, for T1140 you work with the raw12 image
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Alan_
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Bertl
off for now ... bbl
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Bertl
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BAndiT1983|away
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Alan_
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Alan_
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19:28
Alan_
You are taking 64 bits packed sense at a timel , to achieve code ro reduce memory access ,right?
19:28
Alan_
Whatelse is there done to reduce memory access
19:28
Alan_
?
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BAndiT1983
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BAndiT1983|away
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21:24
Bertl_oO
Alan_: the best approach would be to read a number of 64bit words (enough to generate a short memory burst) and to process them with SIMD instructions while cached (with as little other memory access as possible)
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BAndiT1983
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se6astian
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