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ipa: rpi: lux: Use floating statistics region to obtain the current Y value

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The Y value from the first floating region is now a better choice for
a Y value that is invariant to (for example) the metering mode.

Both VC4 and PiSP platforms store full image Y statistics here.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
David Plowman
2025-10-23 12:49:17 +01:00
committed by Kieran Bingham
parent 0810b8a70a
commit 36f9cdcdb4
1 changed files with 9 additions and 2 deletions
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src/ipa/rpi/controller/rpi/lux.cpp
+9 -2
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@@ -85,14 +85,21 @@ void Lux::process(StatisticsPtr &stats, Metadata *imageMetadata)
{
DeviceStatus deviceStatus;
if (imageMetadata->get("device.status", deviceStatus) == 0) {
/*
* We've set up the first floating AGC region to collect full image stats. This
* is a better choice than the Y-histogram, for example, because it's invariant
* to the metering mode (and cheaper to evaluate).
*/
auto const &fullImageStats = stats->agcRegions.getFloating(0);
double currentY = static_cast<double>(fullImageStats.val.ySum) / fullImageStats.counted;
double currentGain = deviceStatus.analogueGain;
double currentAperture = deviceStatus.aperture.value_or(currentAperture_);
double currentY = stats->yHist.interQuantileMean(0, 1);
double gainRatio = referenceGain_ / currentGain;
double exposureTimeRatio =
referenceExposureTime_ / deviceStatus.exposureTime;
double apertureRatio = referenceAperture_ / currentAperture;
double yRatio = currentY * (65536 / stats->yHist.bins()) / referenceY_;
double yRatio = currentY / referenceY_;
double estimatedLux = exposureTimeRatio * gainRatio *
apertureRatio * apertureRatio *
yRatio * referenceLux_ / sensitivity_;