ExposureController.h

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#ifndef EXPOSURECONTROLLER_H

#define EXPOSURECONTROLLER_H

/*
 * Controller for the exposure time of video cameras
 * The Controller assumes that the camera detector hat a linear relationship between exposure time and brightness of the picture.
 */
class ExposureController {
        private:
                int tolerance, min, max;
                int lastExp;
                int calcNewValue(int measuredValue, int target);
        public:
                /*
                 * Constructor
                 * @param _min Minimum Exposure time
                 * @param _max Maximum Exposure time
                 * @param _tolerance No new exposure time will be calculated if distance to target value is below this value
                 * @param _currentExp The current exposure time of the camera
                 */
                ExposureController(int _min, int _max, int _tolerance, int _currentExp) : tolerance(_tolerance), min(_min), max(_max), lastExp(_currentExp) {}

                /*
                 * Call this method to calculate a new exposure time for your camera.
                 * @param measuredValue The measured brightness of the current frame
                 * @param target The target brightness value for the next frames
                 * @return The new exposure time for the next frames
                 */
                int update(int measuredValue, int target);
};

#endif /* end of include guard: EXPOSURECONTROLLER_H */