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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2021-11-16 16:29:23 +0200
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2021-11-23 10:29:31 +0200
commitb0e31c902084b9f4dfa2bafa07a1d62c83eb6292 (patch)
tree2704bf2dfc50e919de33efd7ff8c49ba90125d2b /LICENSES/GPL-2.0.txt
parenta2b4975a1ca0ec122227d5c8c2ef6a6aa28803e5 (diff)
ipa: ipu3: agc: Saturate the averages when computing relative luminance
The relative luminance is calculated using an iterative process to account for saturation in the sensor, as multiplying pixels by a gain doesn't increase the relative luminance by the same factor if some regions are saturated. Relative luminance estimation doesn't apply a saturation, which produces a value that doesn't match what the sensor will output, and defeats the point of the iterative process. Fix it. Fixes: f8f07f9468c6 ("ipa: ipu3: agc: Improve gain calculation") Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Tested-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Tested-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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