src/sensor/pedometer/step_detection.h

   1 /*
   2  *  Copyright (c) 2016-2017 Samsung Electronics Co., Ltd.
   3  *
   4  *  Licensed under the Apache License, Version 2.0 (the "License");
   5  *  you may not use this file except in compliance with the License.
   6  *  You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  *  Unless required by applicable law or agreed to in writing, software
  11  *  distributed under the License is distributed on an "AS IS" BASIS,
  12  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  *  See the License for the specific language governing permissions and
  14  *  limitations under the License.
  15  */
  16
  17 #ifndef __STEP_DETECTION_H__
  18 #define __STEP_DETECTION_H__
  19
  20 #include "average_filter.h"
  21 #include "zero_crossing_step_detection.h"
  22 #include "savitzky_golay_filter15.h"
  23 #include "step_event.h"
  24 #include "common.h"
  25
  26 /************************************************************************
  27  * step detection engine state.
  28  */
  29 class step_detection {
  30 public:
  31         step_detection();
  32         ~step_detection();
  33
  34         /************************************************************************
  35          */
  36         void set_peak_threshold(double threshold);
  37
  38         /************************************************************************
  39          */
  40         void set_use_savitzky(bool use_savitzky);
  41
  42         /************************************************************************
  43          */
  44         bool is_slow_step(void);
  45
  46         /************************************************************************
  47          */
  48         bool add_acc_sensor_values_average(
  49                         timestamp_t timestamp, double acc, step_event* step);
  50
  51         /************************************************************************
  52          */
  53         bool add_acc_sensor_values_savitzky(
  54                         timestamp_t timestamp, double acc, step_event* step);
  55
  56         /************************************************************************
  57          */
  58         bool get_step(timestamp_t timestamp, double acc, step_event* step);
  59
  60         /************************************************************************
  61          * resets step_detection object to initial state.
  62          */
  63         void reset(void);
  64
  65 private:
  66         average_filter m_average_filter;
  67         average_filter m_average_gfilter;
  68         zero_crossing_step_detection m_zero_crossing_up;
  69         zero_crossing_step_detection m_zero_crossing_down;
  70
  71         savitzky_golay_filter15 m_zc_filter;
  72         double m_peak_threshold;
  73         bool m_use_savitzky;
  74         timestamp_t m_last_step_timestamp;
  75         bool m_zero_crossing_up_detected;
  76         bool m_zero_crossing_down_detected;
  77         double m_minimum_acceleration;
  78         double m_maximum_acceleration;
  79         bool m_is_slow_step_detected;
  80 };
  81
  82 #endif /* __STEP_DETECTION_H__ */