edge_detection.h

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/****************************************************************************
 * modules/include/digital_filter/edge_detection.h
 *
 *   Copyright 2021 Sony Semiconductor Solutions Corporation
 *
 * 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 of Sony Semiconductor Solutions Corporation 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
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 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/
 
#ifndef __INCLUDE_EDGE_DETECTION_H
#define __INCLUDE_EDGE_DETECTION_H
 
#include <nuttx/config.h>
 
#include <stdint.h>
 
#define EDGE_DETECT_TYPE_RISE (0) 
#define EDGE_DETECT_TYPE_FALL (1) 
struct edge_detectf_s {
  int type;
  uint32_t prev_width;
  uint32_t width;
  float *boundary;
  float *sub_buf;
  float *remain_data;
};
 
typedef struct edge_detectf_s edge_detectf_t;
 
struct edge_detects_s {
  int type;
  uint32_t prev_width;
  uint32_t width;
  int16_t *boundary;
  int16_t *sub_buf;
  int16_t *remain_data;
};
 
typedef struct edge_detects_s edge_detects_t;
 
#  ifdef __cplusplus
#    define EXTERN extern "C"
extern "C"
{
#  else
#    define EXTERN extern
#  endif
 
/********************************************************************************
 * Public Function Prototypes
 ********************************************************************************/
 
edge_detectf_t *edge_detection_createf(float *boundary_data, int datalen,
    uint32_t keep_width, int type);
 
void edge_detection_deletef(edge_detectf_t *detector);
 
int edge_detectf(edge_detectf_t *detector, float *input, uint32_t len);
 
int edge_detection_resetf(edge_detectf_t *detector);
 
edge_detects_t *edge_detection_creates(int16_t *boundary_data, int datalen,
    uint32_t keep_width, int type);
 
void edge_detection_deletes(edge_detects_t *detector);
 
int edge_detects(edge_detects_t *detector, int16_t *input, uint32_t len);
 
int edge_detection_resets(edge_detects_t *detector);
 
#  undef EXTERN
#  ifdef __cplusplus
}
#  endif
 
#endif  /* __INCLUDE_EDGE_DETECTION_H */