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ipa: rpi: agc: Add an AGC stable region

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Add a small "stable region" parameter (defaulting to 2%) within which
the AGC will not adjust the exposure it requests. It allows
applications to configure the AGC to avoid continual micro-adjustments
of exposure values if they are somehow sensitive to it.

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 08:48:37 +01:00 • committed by Kieran Bingham
parent a04fe76a45
commit 9c90e56733
2 changed files with 8 additions and 0 deletions
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7
src/ipa/rpi/controller/rpi/agc_channel.cpp
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@ -251,6 +251,8 @@ int AgcConfig::read(const libcamera::YamlObject &params)
defaultExposureTime = params["default_exposure_time"].get<double>(1000) * 1us;
defaultAnalogueGain = params["default_analogue_gain"].get<double>(1.0);
stableRegion = params["stable_region"].get<double>(0.02);
return 0;
}
@ -871,6 +873,8 @@ bool AgcChannel::applyDigitalGain(double gain, double targetY, bool channelBound
void AgcChannel::filterExposure()
{
double speed = config_.speed;
double stableRegion = config_.stableRegion;
/*
* AGC adapts instantly if both shutter and gain are directly specified
* or we're in the startup phase.
@ -880,6 +884,9 @@ void AgcChannel::filterExposure()
speed = 1.0;
if (!filtered_.totalExposure) {
filtered_.totalExposure = target_.totalExposure;
} else if (filtered_.totalExposure * (1.0 - stableRegion) < target_.totalExposure &&
filtered_.totalExposure * (1.0 + stableRegion) > target_.totalExposure) {
/* Total exposure must change by more than this or we leave it alone. */
} else {
/*
* If close to the result go faster, to save making so many