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#apertus IRC Channel Logs

2024/04/24

Timezone: UTC


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13:15
vup
btw, does anybody have experience using electroluminescent panels for flatfielding?
13:15
vup
I found out astro people seem to use them, and if actually homogeneous that might be a pretty cheap way to do flatfielding
13:16
se6astian
interesting, how can we verify if a panel is actually homogeneous?
13:19
Bertl
simplest way should be to move the panel or camera in a grid style and take captures (out of focus) then compare the overall results
13:21
se6astian
sounds simple enough, great
13:21
vup
yeah not really sure :P
13:21
vup
I guess in a astro context you could compare a skylight flatfield with the flatfield produced by a el panel to get a rough idea.
13:21
vup
Also, how well are other cameras flat field calibrated? It might be enough to just image the el panel using a commercial camera. (with some difficulties around vignetting due to the lens)
13:22
vup
ah also Bertl, is it currently possible to add custom data to the raw hdmi stream?
13:22
vup
It would be nice to track the sensor registers, especially the temperature.
13:23
Bertl
there are currently as many data islands as vertical sync lines
13:23
Bertl
(so typically 5) at least one of them is used for the AVI info frame
13:24
Bertl
so 3 or 4 could be used to transmit arbitrary sideband data to the HDMI image
13:25
vup
ah I wasnt really thinking about the data island, but more adding a fake image row.
13:25
vup
Can get the contents of the data island from the magewell usb capture card?
13:25
Bertl
ah, yeah, well, you can always add overlay data to the output
13:25
Bertl
and yes, the magewell devices can retrieve the data islands
13:26
vup
only overlay, but also additional rows or columns?
13:27
Bertl
you can, for example, look at them at the config tool for the USB capture
13:27
Bertl
rows/columns only if you change the HDMI mode
13:27
vup
right, that would be fine I guess
13:28
vup
you havent by any chance already reverse engineered the usb requests for the data island? :P
13:28
Bertl
nope, but the API has functions for that IIRC
13:29
vup
ah I completely forgot about the magewell sdk
13:29
vup
will check
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