optical_flow.h - mozsearch

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/*

 * Copyright (c) 2016, Alliance for Open Media. All rights reserved.

 * This source code is subject to the terms of the BSD 2 Clause License and

 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License

 * was not distributed with this source code in the LICENSE file, you can

 * obtain it at www.aomedia.org/license/software. If the Alliance for Open

 * Media Patent License 1.0 was not distributed with this source code in the

 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.

*/

#ifndef AOM_AV1_ENCODER_OPTICAL_FLOW_H_

#define AOM_AV1_ENCODER_OPTICAL_FLOW_H_

#include "aom_scale/yv12config.h"

#include "av1/common/mv.h"

#include "config/aom_config.h"

#ifdef __cplusplus

extern "C" {

#endif

#if CONFIG_OPTICAL_FLOW_API

typedef enum { LUCAS_KANADE, HORN_SCHUNCK } OPTFLOW_METHOD;

typedef enum {

  MV_FILTER_NONE,

  MV_FILTER_SMOOTH,

  MV_FILTER_MEDIAN

} MV_FILTER_TYPE;

typedef struct LOCALMV {

  double row;

  double col;

} LOCALMV;

#define MAX_PYRAMID_LEVELS 5

// default options for optical flow

#define OPFL_WINDOW_SIZE 15

#define OPFL_PYRAMID_LEVELS 3  // total levels

#define OPFL_WARPING_STEPS 3

// parameters specific to Lucas-Kanade

typedef struct lk_params {

  int window_size;

} LK_PARAMS;

// generic structure to contain parameters for all

// optical flow algorithms

typedef struct opfl_params {

  int pyramid_levels;

  int warping_steps;

  LK_PARAMS *lk_params;

  int flags;

} OPFL_PARAMS;

#define OPFL_FLAG_SPARSE 1

void av1_init_opfl_params(OPFL_PARAMS *opfl_params);

void av1_init_lk_params(LK_PARAMS *lk_params);

void av1_optical_flow(const YV12_BUFFER_CONFIG *from_frame,

                      const YV12_BUFFER_CONFIG *to_frame,

                      const int from_frame_idx, const int to_frame_idx,

                      const int bit_depth, const OPFL_PARAMS *opfl_params,

                      const MV_FILTER_TYPE mv_filter,

                      const OPTFLOW_METHOD method, MV *mvs);

#endif

#ifdef __cplusplus

}  // extern "C"

#endif

#endif  // AOM_AV1_ENCODER_OPTICAL_FLOW_H_