227 lines
7.6 KiB
C++
227 lines
7.6 KiB
C++
/* SPDX-FileCopyrightText: 2011 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup bke
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*
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* This file contains implementation of plane tracker.
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*/
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#include "MEM_guardedalloc.h"
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#include "DNA_movieclip_types.h"
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#include "BLI_math_matrix.h"
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#include "BLI_math_vector.h"
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#include "BLI_utildefines.h"
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#include "BKE_tracking.h"
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#include "libmv-capi.h"
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typedef double Vec2[2];
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static int point_markers_correspondences_on_both_image(
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MovieTrackingPlaneTrack *plane_track, int frame1, int frame2, Vec2 **r_x1, Vec2 **r_x2)
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{
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Vec2 *x1, *x2;
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*r_x1 = x1 = MEM_cnew_array<Vec2>(plane_track->point_tracksnr, "point correspondences x1");
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*r_x2 = x2 = MEM_cnew_array<Vec2>(plane_track->point_tracksnr, "point correspondences x2");
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int correspondence_index = 0;
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for (int i = 0; i < plane_track->point_tracksnr; i++) {
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MovieTrackingTrack *point_track = plane_track->point_tracks[i];
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MovieTrackingMarker *point_marker1, *point_marker2;
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point_marker1 = BKE_tracking_marker_get_exact(point_track, frame1);
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point_marker2 = BKE_tracking_marker_get_exact(point_track, frame2);
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if (point_marker1 != nullptr && point_marker2 != nullptr) {
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/* Here conversion from float to double happens. */
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x1[correspondence_index][0] = point_marker1->pos[0];
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x1[correspondence_index][1] = point_marker1->pos[1];
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x2[correspondence_index][0] = point_marker2->pos[0];
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x2[correspondence_index][1] = point_marker2->pos[1];
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correspondence_index++;
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}
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}
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return correspondence_index;
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}
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/* NOTE: frame number should be in clip space, not scene space */
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static void track_plane_from_existing_motion(MovieTrackingPlaneTrack *plane_track,
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int start_frame,
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int direction,
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bool retrack)
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{
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MovieTrackingPlaneMarker *start_plane_marker = BKE_tracking_plane_marker_get(plane_track,
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start_frame);
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MovieTrackingPlaneMarker *keyframe_plane_marker = nullptr;
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MovieTrackingPlaneMarker new_plane_marker;
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int frame_delta = direction > 0 ? 1 : -1;
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if (plane_track->flag & PLANE_TRACK_AUTOKEY) {
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/* Find a keyframe in given direction. */
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for (int current_frame = start_frame;; current_frame += frame_delta) {
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MovieTrackingPlaneMarker *next_plane_marker = BKE_tracking_plane_marker_get_exact(
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plane_track, current_frame + frame_delta);
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if (next_plane_marker == nullptr) {
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break;
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}
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if ((next_plane_marker->flag & PLANE_MARKER_TRACKED) == 0) {
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keyframe_plane_marker = next_plane_marker;
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break;
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}
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}
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}
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else {
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start_plane_marker->flag |= PLANE_MARKER_TRACKED;
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}
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new_plane_marker = *start_plane_marker;
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new_plane_marker.flag |= PLANE_MARKER_TRACKED;
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for (int current_frame = start_frame;; current_frame += frame_delta) {
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MovieTrackingPlaneMarker *next_plane_marker = BKE_tracking_plane_marker_get_exact(
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plane_track, current_frame + frame_delta);
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Vec2 *x1, *x2;
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double H_double[3][3];
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float H[3][3];
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/* As soon as we meet keyframed plane, we stop updating the sequence. */
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if (next_plane_marker && (next_plane_marker->flag & PLANE_MARKER_TRACKED) == 0) {
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/* Don't override keyframes if track is in auto-keyframe mode */
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if (plane_track->flag & PLANE_TRACK_AUTOKEY) {
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break;
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}
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}
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const int num_correspondences = point_markers_correspondences_on_both_image(
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plane_track, current_frame, current_frame + frame_delta, &x1, &x2);
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if (num_correspondences < 4) {
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MEM_freeN(x1);
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MEM_freeN(x2);
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break;
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}
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libmv_homography2DFromCorrespondencesEuc(x1, x2, num_correspondences, H_double);
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copy_m3_m3d(H, H_double);
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for (int i = 0; i < 4; i++) {
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float vec[3] = {0.0f, 0.0f, 1.0f}, vec2[3];
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copy_v2_v2(vec, new_plane_marker.corners[i]);
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/* Apply homography */
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mul_v3_m3v3(vec2, H, vec);
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/* Normalize. */
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vec2[0] /= vec2[2];
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vec2[1] /= vec2[2];
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copy_v2_v2(new_plane_marker.corners[i], vec2);
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}
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new_plane_marker.framenr = current_frame + frame_delta;
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if (!retrack && keyframe_plane_marker && next_plane_marker &&
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(plane_track->flag & PLANE_TRACK_AUTOKEY))
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{
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float fac = (float(next_plane_marker->framenr) - start_plane_marker->framenr) /
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(float(keyframe_plane_marker->framenr) - start_plane_marker->framenr);
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fac = 3 * fac * fac - 2 * fac * fac * fac;
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for (int i = 0; i < 4; i++) {
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interp_v2_v2v2(new_plane_marker.corners[i],
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new_plane_marker.corners[i],
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next_plane_marker->corners[i],
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fac);
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}
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}
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BKE_tracking_plane_marker_insert(plane_track, &new_plane_marker);
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MEM_freeN(x1);
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MEM_freeN(x2);
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}
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}
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void BKE_tracking_track_plane_from_existing_motion(MovieTrackingPlaneTrack *plane_track,
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int start_frame)
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{
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track_plane_from_existing_motion(plane_track, start_frame, 1, false);
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track_plane_from_existing_motion(plane_track, start_frame, -1, false);
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}
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static MovieTrackingPlaneMarker *find_plane_keyframe(MovieTrackingPlaneTrack *plane_track,
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int start_frame,
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int direction)
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{
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MovieTrackingPlaneMarker *plane_marker = BKE_tracking_plane_marker_get(plane_track, start_frame);
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int index = plane_marker - plane_track->markers;
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int frame_delta = direction > 0 ? 1 : -1;
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while (index >= 0 && index < plane_track->markersnr) {
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if ((plane_marker->flag & PLANE_MARKER_TRACKED) == 0) {
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return plane_marker;
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}
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plane_marker += frame_delta;
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}
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return nullptr;
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}
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void BKE_tracking_retrack_plane_from_existing_motion_at_segment(
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MovieTrackingPlaneTrack *plane_track, int start_frame)
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{
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MovieTrackingPlaneMarker *prev_plane_keyframe, *next_plane_keyframe;
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prev_plane_keyframe = find_plane_keyframe(plane_track, start_frame, -1);
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next_plane_keyframe = find_plane_keyframe(plane_track, start_frame, 1);
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if (prev_plane_keyframe != nullptr && next_plane_keyframe != nullptr) {
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/* First we track from left keyframe to the right one without any blending. */
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track_plane_from_existing_motion(plane_track, prev_plane_keyframe->framenr, 1, true);
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/* And then we track from the right keyframe to the left one, so shape blends in nicely */
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track_plane_from_existing_motion(plane_track, next_plane_keyframe->framenr, -1, false);
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}
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else if (prev_plane_keyframe != nullptr) {
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track_plane_from_existing_motion(plane_track, prev_plane_keyframe->framenr, 1, true);
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}
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else if (next_plane_keyframe != nullptr) {
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track_plane_from_existing_motion(plane_track, next_plane_keyframe->framenr, -1, true);
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}
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}
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BLI_INLINE void float_corners_to_double(/*const*/ float corners[4][2], double double_corners[4][2])
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{
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copy_v2db_v2fl(double_corners[0], corners[0]);
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copy_v2db_v2fl(double_corners[1], corners[1]);
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copy_v2db_v2fl(double_corners[2], corners[2]);
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copy_v2db_v2fl(double_corners[3], corners[3]);
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}
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void BKE_tracking_homography_between_two_quads(/*const*/ float reference_corners[4][2],
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/*const*/ float corners[4][2],
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float H[3][3])
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{
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Vec2 x1[4], x2[4];
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double H_double[3][3];
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float_corners_to_double(reference_corners, x1);
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float_corners_to_double(corners, x2);
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libmv_homography2DFromCorrespondencesEuc(x1, x2, 4, H_double);
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copy_m3_m3d(H, H_double);
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}
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