Fix the problem of excessive sensitivity error
The error mainly comes from the following two aspects:
1. Insufficient precision of the hardware (sensor)
As the gain increases, the sensor error will also increase. When the
gain is greater than 31.99..., SENSITIVITY_ERROR_MARGIN_RATE will
exceed the specified 3%.
2. MaxSensorDigitalGain = 1
Since Digital gain will introduce more noise and seriously affect
the image quality, MaxSensorDigitalGain will be set to 1 during
actual use, which will cause a part of real gain to be allocated to
isp Gain, thereby increasing the error.
Solution: According to calculations, when the range of realGain is
[1,64],the range of SENSITIVITY_ERROR_MARGIN_RATE should theoretically
be [0,0.06].
Bug: 196524715
Change-Id: I1724073b81b3f1620eac525e5929224473caf042
Signed-off-by: kongchenrui <kongchenrui@xiaomi.com>
1 file changed
