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ipa: ipu3: agc: Rename exposure values properly

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The exposure value is filtered in filterExposure() using the
currentExposure_ and setting a prevExposure_ variable. This is misnamed
as it is not the previous exposure, but a filtered value.

Rename it accordingly.

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 2021-10-12 07:50:02 +02:00
parent fac6734a4f
commit 02686a052a
2 changed files with 16 additions and 16 deletions
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28
src/ipa/ipu3/algorithms/agc.cpp
View file

@ -49,7 +49,7 @@ static constexpr double kEvGainTarget = 0.5;
Agc::Agc()
: frameCount_(0), lastFrame_(0), iqMean_(0.0), lineDuration_(0s),
maxExposureTime_(0s), prevExposure_(0s), prevExposureNoDg_(0s),
maxExposureTime_(0s), filteredExposure_(0s), filteredExposureNoDg_(0s),
currentExposure_(0s), currentExposureNoDg_(0s)
{
}
@ -100,24 +100,24 @@ void Agc::processBrightness(const ipu3_uapi_stats_3a *stats,
void Agc::filterExposure()
{
double speed = 0.2;
if (prevExposure_ == 0s) {
if (filteredExposure_ == 0s) {
/* DG stands for digital gain.*/
prevExposure_ = currentExposure_;
prevExposureNoDg_ = currentExposureNoDg_;
filteredExposure_ = currentExposure_;
filteredExposureNoDg_ = currentExposureNoDg_;
} else {
/*
* If we are close to the desired result, go faster to avoid making
* multiple micro-adjustments.
* \ todo: Make this customisable?
*/
if (prevExposure_ < 1.2 * currentExposure_ &&
prevExposure_ > 0.8 * currentExposure_)
if (filteredExposure_ < 1.2 * currentExposure_ &&
filteredExposure_ > 0.8 * currentExposure_)
speed = sqrt(speed);
prevExposure_ = speed * currentExposure_ +
prevExposure_ * (1.0 - speed);
prevExposureNoDg_ = speed * currentExposureNoDg_ +
prevExposureNoDg_ * (1.0 - speed);
filteredExposure_ = speed * currentExposure_ +
filteredExposure_ * (1.0 - speed);
filteredExposureNoDg_ = speed * currentExposureNoDg_ +
filteredExposureNoDg_ * (1.0 - speed);
}
/*
* We can't let the no_dg exposure deviate too far below the
@ -125,10 +125,10 @@ void Agc::filterExposure()
* in the ISP to hide it (which will cause nasty oscillation).
*/
double fastReduceThreshold = 0.4;
if (prevExposureNoDg_ <
prevExposure_ * fastReduceThreshold)
prevExposureNoDg_ = prevExposure_ * fastReduceThreshold;
LOG(IPU3Agc, Debug) << "After filtering, total_exposure " << prevExposure_;
if (filteredExposureNoDg_ <
filteredExposure_ * fastReduceThreshold)
filteredExposureNoDg_ = filteredExposure_ * fastReduceThreshold;
LOG(IPU3Agc, Debug) << "After filtering, total_exposure " << filteredExposure_;
}
void Agc::lockExposureGain(uint32_t &exposure, double &gain)

4
src/ipa/ipu3/algorithms/agc.h
View file

@ -44,8 +44,8 @@ private:
utils::Duration lineDuration_;
utils::Duration maxExposureTime_;
utils::Duration prevExposure_;
utils::Duration prevExposureNoDg_;
utils::Duration filteredExposure_;
utils::Duration filteredExposureNoDg_;
utils::Duration currentExposure_;
utils::Duration currentExposureNoDg_;