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Add a Lux helper to libipa that does the estimation of the lux level
given gain, exposure, and luminance histogram. The helper also
handles reading the reference values from the tuning file. These are
expected to be common operations of lux algorithm modules in IPAs, and
is modeled/copied from Raspberry Pi.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Isaac Scott <isaac.scott@ideasonboard.com>
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