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libipa: camera_sensor_helper: Add IMX290 helper

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The IMX290 is a Sony sensor that expresses its gain in 0.3dB units. It
thus maps to the exponential gain model.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
This commit is contained in:
Laurent Pinchart 2022-04-01 14:38:39 +03:00
parent 8ad9249fb0
commit 4011994780
1 changed files with 31 additions and 0 deletions
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31
src/ipa/libipa/camera_sensor_helper.cpp
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@ -332,6 +332,26 @@ std::vector<CameraSensorHelperFactory *> &CameraSensorHelperFactory::factories()
#ifndef __DOXYGEN__ #ifndef __DOXYGEN__
/*
* Helper function to compute the m parameter of the exponential gain model
* when the gain code is expressed in dB.
*/
static constexpr double expGainDb(double step)
{
constexpr double log2_10 = 3.321928094887362;
/*
* The gain code is expressed in step * dB (e.g. in 0.1 dB steps):
*
* G_code = G_dB/step = 20/step*log10(G_linear)
*
* Inverting the formula, we get
*
* G_linear = 10^(step/20*G_code) = 2^(log2(10)*step/20*G_code)
*/
return log2_10 * step / 20;
}
class CameraSensorHelperImx219 : public CameraSensorHelper class CameraSensorHelperImx219 : public CameraSensorHelper
{ {
public: public:
@ -354,6 +374,17 @@ public:
}; };
REGISTER_CAMERA_SENSOR_HELPER("imx258", CameraSensorHelperImx258) REGISTER_CAMERA_SENSOR_HELPER("imx258", CameraSensorHelperImx258)
class CameraSensorHelperImx290 : public CameraSensorHelper
{
public:
CameraSensorHelperImx290()
{
gainType_ = AnalogueGainExponential;
gainConstants_.exp = { 1.0, expGainDb(0.3) };
}
};
REGISTER_CAMERA_SENSOR_HELPER("imx290", CameraSensorHelperImx290)
class CameraSensorHelperOv2740 : public CameraSensorHelper class CameraSensorHelperOv2740 : public CameraSensorHelper
{ {
public: public: