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| 07:04 | se6astian | good morning
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| 07:04 | Bertl | morning se6astian!
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| 07:12 | se6astian | the university is deserted like a hospital in your average hollywood horror film :)
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| 07:13 | Bertl | hehe
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| 07:14 | Bertl | did you seriously expect anything else?
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| 07:20 | se6astian | yes, if there are conferences other events or exams, project deadlines for students we get run over even on days like this in the holidays
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| 07:20 | se6astian | you never know, expect the unexpected :)
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| 07:53 | Bertl | yes, indeed ...
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| 08:13 | Bertl | off to bed now ... have a good one everyone!
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| 17:09 | Bertl | morning everyone!
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| 17:13 | se6astian | hello!
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| 18:59 | troy_s | Greets from Minneapolis.
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| 18:59 | troy_s | guesst: 150 fps is 1/300ths standard.
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| 19:00 | troy_s | (180° shutter should always be inferred)
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| 19:02 | guesst | troy_s: thats exposure, the delay for readout of last line is 1/150
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| 19:03 | troy_s | readout would still be in the 180° shutter off - 1/300th
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| 19:03 | troy_s | (assuming read - dump - read - dump etc.
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| 19:04 | Bertl | readout solely depends on the transfer rate and channels
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| 19:04 | troy_s | Bertl: How does the global shutter work exactly?
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| 19:04 | guesst | troy_s: that is rolling shutter
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| 19:04 | Bertl | in case of the CMV12k, it is max 64 channels at max 600MHz (with new sensors)
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| 19:04 | troy_s | Started on the image viewer.
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| 19:04 | troy_s | By the way.
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| 19:04 | troy_s | guesst: No.
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| 19:05 | troy_s | guesst: You are still always exposing for a full shutter cycle.
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| 19:05 | guesst | you can not dump the whole frame at once
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| 19:05 | troy_s | Dumping is whatever.
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| 19:05 | Bertl | troy_s: what do you want me to tell you about the global shutter?
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| 19:05 | troy_s | Doesn't matter.
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| 19:06 | troy_s | Bertl: Well I have always wondered how ot works.
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| 19:06 | troy_s | Bertl: I mean on some level is the sensel array not charged, and if so, is there not a refresh rate (scanline?) that is unavoidable?
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| 19:07 | troy_s | Bertl: So I started in on an image viewer.
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| 19:07 | Bertl | basically the cmos sensor works with a photodiode which accumulates a charge when light falls onto it
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| 19:07 | troy_s | Bertl: If you look at my github I skeletoned my YCbCr lab app.
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| 19:07 | troy_s | Bertl: So the energy is 100% distributed?
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| 19:08 | Bertl | by manipulating the potential difference on the diode, you can basically disable the sensel
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| 19:08 | Bertl | the 'shutter' itself works by converting the charge to a voltage and storing it in a sample hold capacitor
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| 19:09 | troy_s | Bertl: Is there an upper shutter cap then for dumping the data? Throughput will need to be through the roof to dump in a 270° (90° dump) window?
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| 19:09 | Bertl | (that happens on a per sensel basis)
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| 19:09 | Bertl | the design allows to start sampling long before the previous samples are transferred
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| 19:10 | Bertl | so you can sample (i.e. expose) almost back to back
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| 19:10 | Bertl | as long as the exposure time is at least as long as the readout time
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| 19:10 | troy_s | Bertl: Any forward motion on noise issues?
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| 19:10 | Bertl | yes, we are making good progress there
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| 19:12 | Bertl | the main problem at the moment is to get good data for the FPN
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| 19:13 | Bertl | which basically consists of two components, a static offset and a dynamic gain related pattern
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| 19:15 | Bertl | guesst: did you take a series of black frames with the global shutter on the kodak yet?
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