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/****************************************************************************
*
* Copyright (C) 2012 PX4 Development Team. All rights reserved.
* Author: @author Lorenz Meier <lm@inf.ethz.ch>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name PX4 nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/**
* @file optical_flow.h
* Definition of the optical flow uORB topic.
*/
#ifndef TOPIC_OPTICAL_FLOW_H_
#define TOPIC_OPTICAL_FLOW_H_
#include <stdint.h>
#include <stdbool.h>
#include "../uORB.h"
/**
* @addtogroup topics
*/
/**
* Optical flow in NED body frame in SI units.
*
* @see http://en.wikipedia.org/wiki/International_System_of_Units
*/
struct optical_flow_s {
uint64_t timestamp; /**< in microseconds since system start */
uint64_t flow_timestamp; /**< timestamp from flow sensor */
int16_t flow_raw_x; /**< flow in pixels in X direction, not rotation-compensated */
int16_t flow_raw_y; /**< flow in pixels in Y direction, not rotation-compensated */
float flow_comp_x_m; /**< speed over ground in meters, rotation-compensated */
float flow_comp_y_m; /**< speed over ground in meters, rotation-compensated */
float ground_distance_m; /**< Altitude / distance to ground in meters */
uint8_t quality; /**< Quality of the measurement, 0: bad quality, 255: maximum quality */
uint8_t sensor_id; /**< id of the sensor emitting the flow value */
};
/**
* @}
*/
/* register this as object request broker structure */
ORB_DECLARE(optical_flow);
#endif
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