diff options
| author | Naushir Patuck <naush@raspberrypi.com> | 2023-02-03 09:17:34 +0000 |
|---|---|---|
| committer | Kieran Bingham <kieran.bingham@ideasonboard.com> | 2023-02-09 13:11:44 +0000 |
| commit | 61b43e50e76c16456b5d1873b6efd8aa0e848d6b (patch) | |
| tree | cb7855fde6db4f137f291cf97e10e47a8db246bd /src/ipa/raspberrypi/controller | |
| parent | 6d60f264d1e05bd19640b66bc72bda9f303bf72d (diff) | |
ipa: raspberrypi: Normalise region sums to 16-bits
The VC4 ISP uses a pipeline bit-depth of 13-bits. The AGC algorithm needs to
know this bit-depth when computing the Y value for the image.
Instead of hardcoding the VC4 bit-depth in the AGC source code, normalise all
region sums to 16-bits when filling the Statistics structure. AWB and ALSC are
agnostic about pipeline depth, so do not need changing.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Diffstat (limited to 'src/ipa/raspberrypi/controller')
| -rw-r--r-- | src/ipa/raspberrypi/controller/rpi/agc.cpp | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/src/ipa/raspberrypi/controller/rpi/agc.cpp b/src/ipa/raspberrypi/controller/rpi/agc.cpp index 868c30f0..ea0c82b5 100644 --- a/src/ipa/raspberrypi/controller/rpi/agc.cpp +++ b/src/ipa/raspberrypi/controller/rpi/agc.cpp @@ -28,8 +28,6 @@ LOG_DEFINE_CATEGORY(RPiAgc) #define NAME "rpi.agc" -static constexpr unsigned int PipelineBits = 13; /* seems to be a 13-bit pipeline */ - int AgcMeteringMode::read(const libcamera::YamlObject ¶ms) { const YamlObject &yamlWeights = params["weights"]; @@ -586,6 +584,7 @@ void Agc::fetchAwbStatus(Metadata *imageMetadata) static double computeInitialY(StatisticsPtr &stats, AwbStatus const &awb, double weights[], double gain) { + constexpr unsigned int maxVal = 1 << Statistics::NormalisationFactorPow2; /* * Note how the calculation below means that equal weights give you * "average" metering (i.e. all pixels equally important). @@ -593,9 +592,9 @@ static double computeInitialY(StatisticsPtr &stats, AwbStatus const &awb, double rSum = 0, gSum = 0, bSum = 0, pixelSum = 0; for (unsigned int i = 0; i < stats->agcRegions.numRegions(); i++) { auto ®ion = stats->agcRegions.get(i); - double rAcc = std::min<double>(region.val.rSum * gain, ((1 << PipelineBits) - 1) * region.counted); - double gAcc = std::min<double>(region.val.gSum * gain, ((1 << PipelineBits) - 1) * region.counted); - double bAcc = std::min<double>(region.val.bSum * gain, ((1 << PipelineBits) - 1) * region.counted); + double rAcc = std::min<double>(region.val.rSum * gain, (maxVal - 1) * region.counted); + double gAcc = std::min<double>(region.val.gSum * gain, (maxVal - 1) * region.counted); + double bAcc = std::min<double>(region.val.bSum * gain, (maxVal - 1) * region.counted); rSum += rAcc * weights[i]; gSum += gAcc * weights[i]; bSum += bAcc * weights[i]; @@ -608,7 +607,7 @@ static double computeInitialY(StatisticsPtr &stats, AwbStatus const &awb, double ySum = rSum * awb.gainR * .299 + gSum * awb.gainG * .587 + bSum * awb.gainB * .114; - return ySum / pixelSum / (1 << PipelineBits); + return ySum / pixelSum / maxVal; } /* |