av1/encoder/global_motion.h

/*
 * 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 AV1_ENCODER_GLOBAL_MOTION_H_
#define AV1_ENCODER_GLOBAL_MOTION_H_

#include "aom/aom_integer.h"
#include "aom_scale/yv12config.h"
#include "av1/common/mv.h"

#ifdef __cplusplus
extern "C" {
#endif

#define RANSAC_NUM_MOTIONS 1

void convert_model_to_params(const double *params, WarpedMotionParams *model);

int is_enough_erroradvantage(double best_erroradvantage, int params_cost,
                             int erroradv_type);

// Returns the av1_warp_error between "dst" and the result of applying the
// motion params that result from fine-tuning "wm" to "ref". Note that "wm" is
// modified in place.
int64_t refine_integerized_param(WarpedMotionParams *wm,
                                 TransformationType wmtype, int use_hbd, int bd,
                                 uint8_t *ref, int r_width, int r_height,
                                 int r_stride, uint8_t *dst, int d_width,
                                 int d_height, int d_stride, int n_refinements,
                                 int64_t best_frame_error);

/*
  Computes "num_motions" candidate global motion parameters between two frames.
  The array "params_by_motion" should be length 8 * "num_motions". The ordering
  of each set of parameters is best described  by the homography:

        [x'     (m2 m3 m0   [x
    z .  y'  =   m4 m5 m1 *  y
         1]      m6 m7 1)    1]

  where m{i} represents the ith value in any given set of parameters.

  "num_inliers" should be length "num_motions", and will be populated with the
  number of inlier feature points for each motion. Params for which the
  num_inliers entry is 0 should be ignored by the caller.
*/
int compute_global_motion_feature_based(TransformationType type,
                                        YV12_BUFFER_CONFIG *frm,
                                        YV12_BUFFER_CONFIG *ref, int bit_depth,
                                        int *num_inliers_by_motion,
                                        double *params_by_motion,
                                        int num_motions);
#ifdef __cplusplus
}  // extern "C"
#endif
#endif  // AV1_ENCODER_GLOBAL_MOTION_H_