diff options
| -rw-r--r-- | src/ipa/libipa/camera_sensor_helper.cpp | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/ipa/libipa/camera_sensor_helper.cpp b/src/ipa/libipa/camera_sensor_helper.cpp index 7bb999e1..136b9f6b 100644 --- a/src/ipa/libipa/camera_sensor_helper.cpp +++ b/src/ipa/libipa/camera_sensor_helper.cpp @@ -332,6 +332,26 @@ std::vector<CameraSensorHelperFactory *> &CameraSensorHelperFactory::factories() #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 { public: @@ -354,6 +374,17 @@ public: }; 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 { public: |