Ancestors

Written by Manawyrm | Sarah on 2024-12-18 at 22:29

Friends don‘t let friends touch USB internals 🙃

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Toot

Written by Manawyrm | Sarah on 2025-01-04 at 19:45

Update: @Toble_Miner and I won! This actually works now :)

https://kittenlabs.de/16bit-lvds-fx3-grabber/

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Descendants

Written by juvi back in gremnay on 2025-01-04 at 19:53

@manawyrm i can just grab anything that has an lvds cable with it?

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Written by Manawyrm | Sarah on 2025-01-04 at 21:02

@danb this sent me down a little rabbit hole...

sooo... serial LVDS (which is what laptop panels are doing) is very similar to DVI or HDMI (from an electrical view).

you'd need something to de-serialize that. either a specialized chip (which do seem to exist) or a small FPGA (ecp5 maybe).

FX3 would still be a good fit, but a different carrier board would be required.

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Written by juvi back in gremnay on 2025-01-04 at 23:21

@manawyrm oh, sorry haha, but interesting to know :)

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Written by Foone🏳️‍⚧️ on 2025-01-04 at 20:02

@manawyrm oooh, this looks like something I need 9000%

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Written by elly on 2025-01-04 at 20:15

@manawyrm This would be so useful for retro/embedded hardware with potentially broken panels that you can't get replacements for

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Written by ash, legally :neocat_flag_genderfluid: on 2025-01-04 at 20:36

@manawyrm@chaos.social "Due to limitations in USB UVC descriptor/color format support, this firmware reports itself to the OS as a YUYV/YUV2 device, in other words a 16bit per pixel color video signal. This will create wrong color images when viewed on regular software (like VLC Media Player), the raw stream can be viewed & interpreted using Video4Linux, GStreamer, etc. though."

... actually I'm not sure I want to know x.x

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Written by Manawyrm | Sarah on 2025-01-04 at 20:41

@darkphoenix the USB UVC spec does have a format code for grayscale high bit-depth images. I've tried to set this, but the only result was that neither Windows, VLC, GStreamer, etc. knew how to handle the video device in any way.

So instead I just report YUYV and that's good enough to get some output from VLC for debugging...

If you then write your own tooling to parse the actual 16bit values, you can also just re-interpret the bytes properly.

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Written by BenBE on 2025-01-04 at 20:45

@manawyrm I wonder how programs would react, if you were to report 1024 color channels with 12 bit each …

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Written by Manawyrm | Sarah on 2025-01-04 at 20:47

@benbe i can't change anything about the actual data format -- that's very much 1:1 hardwired the format coming in from the sensor.

so it's just an interpretation detail in the end.

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Written by BenBE on 2025-01-04 at 22:16

@manawyrm Was more thinking of creating a spectral camera sensor where multiple images are overlaid to one image with several color channels for several distinct spectral lines.

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Written by Henning Paul DC4HP on 2025-01-05 at 09:26

@manawyrm @Toble_Miner Do you have an example what sensor one could attach?

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