diff options
| author | Naushir Patuck <naush@raspberrypi.com> | 2022-04-05 07:57:58 +0100 |
|---|---|---|
| committer | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2022-04-06 15:30:37 +0300 |
| commit | 226792a1411bd485e087bf40e241611966099b52 (patch) | |
| tree | 343a589c1385bee628ae015f54255050cfd8e1f3 /src/ipa/raspberrypi/controller/rpi/alsc.hpp | |
| parent | c45f9ce04ccc6e7770e2bdd7e9d42b83c7b95835 (diff) | |
ipa: raspberrypi: alsc: Limit the calculated lambda values
Under the right circumstances, the alsc calculations could spread the colour
errors across the entire image as lambda remains unbound. This would cause the
corrected image chroma values to slowly drift to incorrect values.
This change adds a config parameter (alsc.lambda_bound) that provides an upper
and lower bound to the lambda value at every stage of the calculation. With this
change, we now adjust the lambda values so that the average across the entire
grid is 1 instead of normalising to the minimum value.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Naushir Patuck <naush@raspberrypi.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'src/ipa/raspberrypi/controller/rpi/alsc.hpp')
| -rw-r--r-- | src/ipa/raspberrypi/controller/rpi/alsc.hpp | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/ipa/raspberrypi/controller/rpi/alsc.hpp b/src/ipa/raspberrypi/controller/rpi/alsc.hpp index 9616b99e..d1dbe0d1 100644 --- a/src/ipa/raspberrypi/controller/rpi/alsc.hpp +++ b/src/ipa/raspberrypi/controller/rpi/alsc.hpp @@ -41,6 +41,7 @@ struct AlscConfig { std::vector<AlscCalibration> calibrations_Cb; double default_ct; // colour temperature if no metadata found double threshold; // iteration termination threshold + double lambda_bound; // upper/lower bound for lambda from a value of 1 }; class Alsc : public Algorithm |