Feature request: Disabling denoise

[hrj]

According to the discussion here, it is possible to suppress denoising by setting parameter MMAL_PARAMETER_STILLS_DENOISE to MMAL_FALSE.

Can you please expose this through picamerax? It will help immensely with low-light photography.

While we are at it, being able to set MMAL_PARAMETER_CAMERA_ISP_BLOCK_OVERRIDE would be also great. Setting it to ~0x80 apparently disables pixel-correction.

thanks!

[jtc42]

Yeah I’m so sorry I only just saw this. I somehow disabled notifications for this repo and so didn’t see the issue.

I have really limited time to spend on this now, but I’ll certainly look into it. @rwb27 may be able to help too, but again it may be way out of scope.

The other option may be that IIRC the raw bayer data doesn’t include denoising (I may be wrong though) so if that’s the case you can use the bayer data to get what you need.

[rwb27]

Yes, the Bayer data is pre-denoising. If it's a simple parameter to add, it shouldn't be a big job; it's worth noting, though, that the Pi foundation have now got a libcamera interface, which feels like it solves most of the problems we are trying to fix with picamerax - so it might be in the near future that we can abandon picamerax in favour of that other, much clearer interface.

I'll leave this open and look at it if I can.