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| author | Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> | 2021-11-04 10:58:07 +0100 |
|---|---|---|
| committer | Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> | 2021-11-15 11:00:05 +0100 |
| commit | f8f07f9468c6618b73710e3d341ce59ce08ccc08 (patch) | |
| tree | 811f88b2a4e226e6edb6efc17a7e34f026f7c085 /src/ipa/ipu3/ipa_context.h | |
| parent | 3d81620b20e853650d2baadab1b7b8bdc82c94d5 (diff) | |
ipa: ipu3: agc: Improve gain calculation
When an image is partially saturated, its brightness is not increasing
linearly when the shutter time or gain increases. It is a big issue with
a backlight as the algorithm is fading to darkness right now.
Introduce a function to estimate the brightness of the frame, based on
the current exposure/gain and loop on it several times to estimate it
again and approach the non linear function.
Inspired-by: 7de5506c30b3 ("libcamera: src: ipa: raspberrypi: agc: Improve gain update calculation for partly saturated images")
Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Diffstat (limited to 'src/ipa/ipu3/ipa_context.h')
0 files changed, 0 insertions, 0 deletions