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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2019, Raspberry Pi (Trading) Limited
*
* lux_status.h - Lux control algorithm status
*/
#pragma once
/*
* The "lux" algorithm looks at the (AGC) histogram statistics of the frame and
* estimates the current lux level of the scene. It does this by a simple ratio
* calculation comparing to a reference image that was taken in known conditions
* with known statistics and a properly measured lux level. There is a slight
* problem with aperture, in that it may be variable without the system knowing
* or being aware of it. In this case an external application may set a
* "current_aperture" value if it wishes, which would be used in place of the
* (presumably meaningless) value in the image metadata.
*/
#ifdef __cplusplus
extern "C" {
#endif
struct LuxStatus {
double lux;
double aperture;
};
#ifdef __cplusplus
}
#endif
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