From 0539e88679df7454d761b607ea82b351e4747a8b Mon Sep 17 00:00:00 2001 From: Stefan Klug Date: Wed, 19 Mar 2025 17:01:36 +0100 Subject: ipa: rkisp1: agc: Fix metering modes The weights for a given metering mode are applied to the histogram data inside the histogram statistics block. The AE statistics do not contain any weights. Therefore the weights are honored when AgcMeanLuminance calculates the upper or lower constraints, but ignored in the calculation of the frame luminance. Fix that by manually applying the weights in the luminance calculation. Fixes: 4c5152843a2a ("ipa: rkisp1: Derive rkisp1::algorithms::Agc from AgcMeanLuminance") Signed-off-by: Stefan Klug Reviewed-by: Daniel Scally Reviewed-by: Kieran Bingham --- src/ipa/rkisp1/algorithms/agc.cpp | 13 ++++++++++--- src/ipa/rkisp1/algorithms/agc.h | 1 + 2 files changed, 11 insertions(+), 3 deletions(-) diff --git a/src/ipa/rkisp1/algorithms/agc.cpp b/src/ipa/rkisp1/algorithms/agc.cpp index 5a3ba013..101cad5d 100644 --- a/src/ipa/rkisp1/algorithms/agc.cpp +++ b/src/ipa/rkisp1/algorithms/agc.cpp @@ -439,15 +439,20 @@ void Agc::fillMetadata(IPAContext &context, IPAFrameContext &frameContext, */ double Agc::estimateLuminance(double gain) const { + ASSERT(expMeans_.size() == weights_.size()); double ySum = 0.0; + double wSum = 0.0; /* Sum the averages, saturated to 255. */ - for (uint8_t expMean : expMeans_) - ySum += std::min(expMean * gain, 255.0); + for (unsigned i = 0; i < expMeans_.size(); i++) { + double w = weights_[i]; + ySum += std::min(expMeans_[i] * gain, 255.0) * w; + wSum += w; + } /* \todo Weight with the AWB gains */ - return ySum / expMeans_.size() / 255; + return ySum / wSum / 255; } /** @@ -515,6 +520,8 @@ void Agc::process(IPAContext &context, [[maybe_unused]] const uint32_t frame, Histogram hist({ params->hist.hist_bins, context.hw->numHistogramBins }, [](uint32_t x) { return x >> 4; }); expMeans_ = { params->ae.exp_mean, context.hw->numAeCells }; + std::vector &modeWeights = meteringModes_.at(frameContext.agc.meteringMode); + weights_ = { modeWeights.data(), modeWeights.size() }; /* * Set the AGC limits using the fixed exposure time and/or gain in diff --git a/src/ipa/rkisp1/algorithms/agc.h b/src/ipa/rkisp1/algorithms/agc.h index 62bcde99..7867eed9 100644 --- a/src/ipa/rkisp1/algorithms/agc.h +++ b/src/ipa/rkisp1/algorithms/agc.h @@ -55,6 +55,7 @@ private: utils::Duration frameDuration); Span expMeans_; + Span weights_; std::map> meteringModes_; }; -- cgit v1.2.1