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-rw-r--r--src/ipa/ipu3/algorithms/agc.cpp16
1 files changed, 14 insertions, 2 deletions
diff --git a/src/ipa/ipu3/algorithms/agc.cpp b/src/ipa/ipu3/algorithms/agc.cpp
index 5723f6f3..83aa3676 100644
--- a/src/ipa/ipu3/algorithms/agc.cpp
+++ b/src/ipa/ipu3/algorithms/agc.cpp
@@ -63,6 +63,12 @@ static constexpr uint32_t knumHistogramBins = 256;
/* Target value to reach for the top 2% of the histogram */
static constexpr double kEvGainTarget = 0.5;
+/*
+ * Maximum ratio of saturated pixels in a cell for the cell to be considered
+ * non-saturated and counted by the AGC algorithm.
+ */
+static constexpr uint32_t kMinCellsPerZoneRatio = 255 * 20 / 100;
+
Agc::Agc()
: frameCount_(0), lastFrame_(0), iqMean_(0.0), lineDuration_(0s),
minExposureLines_(0), maxExposureLines_(0), filteredExposure_(0s),
@@ -124,7 +130,7 @@ void Agc::measureBrightness(const ipu3_uapi_stats_3a *stats,
&stats->awb_raw_buffer.meta_data[cellPosition]
);
- if (cell->sat_ratio == 0) {
+ if (cell->sat_ratio <= kMinCellsPerZoneRatio) {
uint8_t gr = cell->Gr_avg;
uint8_t gb = cell->Gb_avg;
/*
@@ -137,8 +143,14 @@ void Agc::measureBrightness(const ipu3_uapi_stats_3a *stats,
}
}
+ Histogram cumulativeHist = Histogram(Span<uint32_t>(hist));
/* Estimate the quantile mean of the top 2% of the histogram */
- iqMean_ = Histogram(Span<uint32_t>(hist)).interQuantileMean(0.98, 1.0);
+ if (cumulativeHist.total() == 0) {
+ /* Force the value as histogram is empty */
+ iqMean_ = knumHistogramBins - 0.5;
+ } else {
+ iqMean_ = cumulativeHist.interQuantileMean(0.98, 1.0);
+ }
}
/**