[libcamera-devel] libcamera on Librem 5, phase detection auto focus

[Pavel Machek]

Hi!

> > > So far I'm working with contrast detection, but samsung chip should
> > > support phase detection auto focus, too. So far I hacked
> > > drivers/media/i2c/s5k3l6xx.ko not to filter out those bits and took
> > > photos (and looked at them in darktable), but I don't see any obvious
> > > "defects" indicating presense of focus data. Do you have any pointers
> > > to more information by chance?
> > > 
> > > I took deliberately defocused photo to make "defects" easier to see. I
> > > guess I should take another one with less gain to keep other noise
> > > down. Any ideas how to locate those bits?  
> > 
> > The PDAF pixels will be located at fixed positions in the pixel array,
> > documented by the sensor vendor. Some sensors will process the PDAF
> > pixels and provide the processed information in the CSI-2 embedded data.
> > I don't have access to the sensor datasheet, so I can't help much I'm
> > afraid :-(
> > 
> The focus pixels will appear sometimes - I haven't quite figured out when - when the resolution is full and when denoising is off. That's not described in the datasheet very well. I did prepare a bunch of scripts to mess with the sensors registers in this repo (beware, here be dragons) https://source.puri.sm/dorota.czaplejewicz/nani
>

Thanks for pointer.

Is it possible to get the datasheet somewhere?

Would you have example file with the focus pixels by chance? I guess
first step is to figure out the pattern of the dots...

Best regards,
								Pavel
-- 
People of Russia, stop Putin before his war on Ukraine escalates.
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