[libcamera-devel] [PATCH 2/2] ipa: raspberrypi: AWB: Ignore invalid statistics zones correctly

[Naushir Patuck]

Hi David,

Thank you for your patch.

On Thu, 25 Feb 2021 at 17:01, David Plowman <david.plowman at raspberrypi.com>
wrote:

> Regions of the image where the statistics are not trusted should not
> be put in the zones_ list.
>
> This also means that the AWB may fail to run initially, so
> async_results_ needs to be initialised to some kind of default.
>
> Finally, the RGB zone structures can be zero-initialised safely now,
> the previous value of -1 would seem unusual.
>
> Signed-off-by: David Plowman <david.plowman at raspberrypi.com>
>

Reviewed-by: Naushir Patuck <naush at raspberrypi.com>


> ---
>  src/ipa/raspberrypi/controller/rpi/awb.cpp | 3 ++-
>  src/ipa/raspberrypi/controller/rpi/awb.hpp | 2 +-
>  2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/src/ipa/raspberrypi/controller/rpi/awb.cpp
> b/src/ipa/raspberrypi/controller/rpi/awb.cpp
> index 791a7039..1c917e4f 100644
> --- a/src/ipa/raspberrypi/controller/rpi/awb.cpp
> +++ b/src/ipa/raspberrypi/controller/rpi/awb.cpp
> @@ -169,6 +169,7 @@ void Awb::Initialise()
>                         sync_results_.gain_b = 1.0;
>         }
>         prev_sync_results_ = sync_results_;
> +       async_results_ = sync_results_;
>  }
>
>  unsigned int Awb::GetConvergenceFrames() const
> @@ -345,9 +346,9 @@ static void generate_stats(std::vector<Awb::RGB>
> &zones,
>                         if (zone.G >= min_G) {
>                                 zone.R = stats[i].r_sum / counted;
>                                 zone.B = stats[i].b_sum / counted;
> +                               zones.push_back(zone);
>                         }
>                 }
> -               zones.push_back(zone);
>         }
>  }
>
> diff --git a/src/ipa/raspberrypi/controller/rpi/awb.hpp
> b/src/ipa/raspberrypi/controller/rpi/awb.hpp
> index 2fe59c37..8af1f27c 100644
> --- a/src/ipa/raspberrypi/controller/rpi/awb.hpp
> +++ b/src/ipa/raspberrypi/controller/rpi/awb.hpp
> @@ -90,7 +90,7 @@ public:
>         void Prepare(Metadata *image_metadata) override;
>         void Process(StatisticsPtr &stats, Metadata *image_metadata)
> override;
>         struct RGB {
> -               RGB(double _R = -1.0, double _G = -1.0, double _B = -1.0)
> +               RGB(double _R = 0, double _G = 0, double _B = 0)
>                         : R(_R), G(_G), B(_B)
>                 {
>                 }
> --
> 2.20.1
>
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