Imx662 fixes - #353
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IMX662 can still share its CamHelper with the IMX290 and other sensors, but requires a frameIntegrationDiff of 6 (as opposed to 2 for the others). The value 2 is invalid for the IMX662 and can lead to bad black level values in HCG (High Conversion Gain) mode. The CamHelperImx290 constructor is refactored slightly to allow the IMX662 version to be created with a custom frameIntegrationDiff. Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Optionally, a PWL (piecewise linear) function can be specified as the black level instead of a constant value. This PWL is evaluated at the current analogue gain for each frame. Tuning files will also accept "black_level_func" as a shorthand for all three channels. Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
At very high gains, the measured black level increases noticeably from the nominal value of 3200. Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
The CT (colour temperature) curve is extended at the bottom end, so that low lightl halogen images are less orange. Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
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Fixes to make the IMX662 work better: