NekoCWD/libcamera
NekoCWD/libcamera
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages 7 Wiki Activity Actions

ipa: rkisp1: agc: drop hard-coded analogue gain range

Browse source 
As the sensor's analogue gain range is known (read-out in
IPARkISP1::configure()), drop the limiting hard-coded range.
This enables better performance in low-light conditions for sensors with
a higher gain (e.g. the imx327).

Signed-off-by: Benjamin Bara <benjamin.bara@skidata.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
Benjamin Bara 2023-05-19 16:51:09 +02:00 • committed by Kieran Bingham
parent e8fccaea46
commit a3178dd039
1 changed files with 3 additions and 16 deletions
Download patch file Download diff file Expand all files Collapse all files

19
src/ipa/rkisp1/algorithms/agc.cpp
View file

@ -36,15 +36,6 @@ namespace ipa::rkisp1::algorithms {
LOG_DEFINE_CATEGORY(RkISP1Agc)
/*
* Limits for analogue gain values
*
* \todo Remove the hard-coded limits and let the sensor helper specify
* the minimum and maximum allowed gain values.
*/
static constexpr double kMinAnalogueGain = 1.0;
static constexpr double kMaxAnalogueGain = 16.0;
/* \todo Honour the FrameDurationLimits control instead of hardcoding a limit */
static constexpr utils::Duration kMaxShutterSpeed = 60ms;
@ -80,9 +71,7 @@ Agc::Agc()
int Agc::configure(IPAContext &context, const IPACameraSensorInfo &configInfo)
{
/* Configure the default exposure and gain. */
context.activeState.agc.automatic.gain =
std::max(context.configuration.sensor.minAnalogueGain,
kMinAnalogueGain);
context.activeState.agc.automatic.gain = context.configuration.sensor.minAnalogueGain;
context.activeState.agc.automatic.exposure =
10ms / context.configuration.sensor.lineDuration;
context.activeState.agc.manual.gain = context.activeState.agc.automatic.gain;
@ -265,10 +254,8 @@ void Agc::computeExposure(IPAContext &context, IPAFrameContext &frameContext,
utils::Duration maxShutterSpeed = std::min(configuration.sensor.maxShutterSpeed,
kMaxShutterSpeed);
double minAnalogueGain = std::max(configuration.sensor.minAnalogueGain,
kMinAnalogueGain);
double maxAnalogueGain = std::min(configuration.sensor.maxAnalogueGain,
kMaxAnalogueGain);
double minAnalogueGain = configuration.sensor.minAnalogueGain;
double maxAnalogueGain = configuration.sensor.maxAnalogueGain;
/* Consider within 1% of the target as correctly exposed. */
if (utils::abs_diff(evGain, 1.0) < 0.01)