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ipa: ipu3: Introduce a modular tone mapping algorithm

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Introduce a new algorithm to manage the tone mapping handling of the
IPU3.

The initial algorithm is chosen to configure the gamma contrast curve
which moves the implementation out of AWB for simplicity. As it is
initialised with a default gamma value of 1.1, there is no need to use
the default table at initialisation anymore.

This demonstrates the way to use process() call when the EventStatReady
comes in. The function calculates the LUT in the context of a frame, and
when prepare() is called, the parameters are filled with the updated
values.

AGC is modified to take the new process interface into account.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Jean-Michel Hautbois 2021-08-19 10:49:42 +02:00
parent 96dfda8e4b
commit fcf56b9716
9 changed files with 116 additions and 48 deletions
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5
src/ipa/ipu3/ipu3_agc.cpp
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@ -52,7 +52,7 @@ static constexpr uint8_t kCellSize = 8;
IPU3Agc::IPU3Agc()
: frameCount_(0), lastFrame_(0), converged_(false),
updateControls_(false), iqMean_(0.0), gamma_(1.0),
updateControls_(false), iqMean_(0.0),
lineDuration_(0s), maxExposureTime_(0s),
prevExposure_(0s), prevExposureNoDg_(0s),
currentExposure_(0s), currentExposureNoDg_(0s)
@ -104,9 +104,6 @@ void IPU3Agc::processBrightness(const ipu3_uapi_stats_3a *stats)
}
}
/* Limit the gamma effect for now */
gamma_ = 1.1;
/* Estimate the quantile mean of the top 2% of the histogram */
iqMean_ = Histogram(Span<uint32_t>(hist)).interQuantileMean(0.98, 1.0);
}