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ipa: rpi: contrast: Allow adaptive contrast enhancement to be disabled

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The enableCe() function enables or disables adaptive contrast
enhancement and the restoreCe() function sets it back to its normal
state (which is what was read from the tuning file).

In future, algorithms like HDR might want to take over tonemapping
functions, so any dynamic behaviour here would upset them.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
David Plowman 2023-10-13 08:48:38 +01:00 • committed by Kieran Bingham
parent 9c90e56733
commit 0ff20bf8c1
3 changed files with 17 additions and 1 deletions
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2
src/ipa/rpi/controller/contrast_algorithm.h
View file

@ -17,6 +17,8 @@ public:
/* A contrast algorithm must provide the following: */
virtual void setBrightness(double brightness) = 0;
virtual void setContrast(double contrast) = 0;
virtual void enableCe(bool enable) = 0;
virtual void restoreCe() = 0;
};
} /* namespace RPiController */

13
src/ipa/rpi/controller/rpi/contrast.cpp
View file

@ -42,6 +42,7 @@ int Contrast::read(const libcamera::YamlObject &params)
{
// enable adaptive enhancement by default
config_.ceEnable = params["ce_enable"].get<int>(1);
ceEnable_ = config_.ceEnable;
// the point near the bottom of the histogram to move
config_.loHistogram = params["lo_histogram"].get<double>(0.01);
// where in the range to try and move it to
@ -65,6 +66,16 @@ void Contrast::setContrast(double contrast)
contrast_ = contrast;
}
void Contrast::enableCe(bool enable)
{
ceEnable_ = enable;
}
void Contrast::restoreCe()
{
ceEnable_ = config_.ceEnable;
}
void Contrast::initialise()
{
/*
@ -150,7 +161,7 @@ void Contrast::process(StatisticsPtr &stats,
* histogram down, and possibly push the end up.
*/
Pwl gammaCurve = config_.gammaCurve;
if (config_.ceEnable) {
if (ceEnable_) {
if (config_.loMax != 0 || config_.hiMax != 0)
gammaCurve = computeStretchCurve(histogram, config_).compose(gammaCurve);
/*

3
src/ipa/rpi/controller/rpi/contrast.h
View file

@ -37,6 +37,8 @@ public:
int read(const libcamera::YamlObject &params) override;
void setBrightness(double brightness) override;
void setContrast(double contrast) override;
void enableCe(bool enable) override;
void restoreCe() override;
void initialise() override;
void prepare(Metadata *imageMetadata) override;
void process(StatisticsPtr &stats, Metadata *imageMetadata) override;
@ -46,6 +48,7 @@ private:
double brightness_;
double contrast_;
ContrastStatus status_;
double ceEnable_;
};
} /* namespace RPiController */