Lens Shading Calibration

[raspberry-pi-camera]

Lens Shading Calibration

[rf152]

From a quick look in the linked document, this would require a re-writing the code to apply the lens shading to the mmal capture object (see the section 2.5 Change the Raspistill.c file)

I don't have an arducam lens, and cannot test this. If you want to create a pull request to add this functionality then feel free.

[IrPgFKS0]

I don’t know much about C, but I followed the linked instructions for my arducam camera and it worked like a charm for “raspistill”, so maybe I will take a stab at it.

Do you know what “.c” object I would need to edit (just main.cpp?) and would that be configurable for other lens, otherwise this change would really be pointless?

[rf152]

The whole program is in main.cpp, so that's the file you'd need, yes.

The MMAL configuration is set between lines 440 and 485, so it would make most sense probably to put the configuration below that. If you want to have a config file option then you will need to add some logic to pull that out (see line 328 for an example of reading a config value).

[IrPgFKS0]

Thank you

[yomebzh]

Hello, if you have found the solution, I am interested
thank you

[github-actions]

No update to this issue for 30 days. Closing

[IrPgFKS0]

I just wanted to post here for other people that may have this question, that I did end up solving this issue. Thanks to Jörn Nettingsmeier for the idea, I made another fork which allows you to simply apply the --tuning-file command directly to the raspindi binary and this for my Arducam worked perfectly...

https://github.com/IrPgFKS0/raspindi

Example:
/opt/raspindi/bin/raspindi -t 0 --width 1920 --height 1080 --tuning-file imx477_original.json --codec yuv420 --framerate 25

[rf152]

There's some interesting work you've done. I'll try to have a proper look, and see if I can come up with a way of making it backward compatible with the config file format, and merge it into the main repo, if you're ok with that?

[IrPgFKS0]

Yes, I am fine either way. I mostly just wanted to post this solution so anyone could fix that shading issue (drove me nuts)! Also the native libraries do support a config file flag so maybe that could be merged together with raspindi's config file.

rpicam-vid -h

-c [ --config ] [=arg(=config.txt)] Read the options from a file. If no filename is specified, default to
config.txt. In case of duplicate options, the ones provided on the command line
will be used. Note that the config file must only contain the long form
options.

[github-actions]

No update to this issue for 30 days. Closing