360 lines
12 KiB
C
360 lines
12 KiB
C
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2011 Blender Foundation.
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* All rights reserved.
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*
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* Contributor(s): Blender Foundation,
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* Sergey Sharybin
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* Keir Mierle
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/** \file blender/blenkernel/intern/tracking_region_tracker.c
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* \ingroup bke
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*
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* This file contains implementation of blender-side region tracker
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* which is used for 2D feature tracking.
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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_utildefines.h"
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#include "BLI_threads.h"
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#include "BKE_tracking.h"
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#include "BKE_movieclip.h"
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#include "IMB_imbuf_types.h"
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#include "IMB_imbuf.h"
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#include "libmv-capi.h"
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#include "tracking_private.h"
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/* **** utility functions for tracking **** */
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/* convert from float and byte RGBA to grayscale. Supports different coefficients for RGB. */
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static void float_rgba_to_gray(const float *rgba, float *gray, int num_pixels,
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float weight_red, float weight_green, float weight_blue)
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{
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int i;
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for (i = 0; i < num_pixels; i++) {
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const float *pixel = rgba + 4 * i;
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gray[i] = weight_red * pixel[0] + weight_green * pixel[1] + weight_blue * pixel[2];
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}
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}
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static void uint8_rgba_to_float_gray(const unsigned char *rgba, float *gray, int num_pixels,
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float weight_red, float weight_green, float weight_blue)
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{
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int i;
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for (i = 0; i < num_pixels; i++) {
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const unsigned char *pixel = rgba + i * 4;
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gray[i] = (weight_red * pixel[0] + weight_green * pixel[1] + weight_blue * pixel[2]) / 255.0f;
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}
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}
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/* Get grayscale float search buffer for given marker and frame. */
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static float *track_get_search_floatbuf(ImBuf *ibuf, MovieTrackingTrack *track, MovieTrackingMarker *marker,
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int *width_r, int *height_r)
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{
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ImBuf *searchibuf;
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float *gray_pixels;
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int width, height;
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searchibuf = BKE_tracking_get_search_imbuf(ibuf, track, marker, false, true);
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if (!searchibuf) {
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*width_r = 0;
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*height_r = 0;
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return NULL;
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}
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width = searchibuf->x;
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height = searchibuf->y;
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gray_pixels = MEM_callocN(width * height * sizeof(float), "tracking floatBuf");
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if (searchibuf->rect_float) {
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float_rgba_to_gray(searchibuf->rect_float, gray_pixels, width * height,
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0.2126f, 0.7152f, 0.0722f);
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}
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else {
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uint8_rgba_to_float_gray((unsigned char *)searchibuf->rect, gray_pixels, width * height,
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0.2126f, 0.7152f, 0.0722f);
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}
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IMB_freeImBuf(searchibuf);
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*width_r = width;
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*height_r = height;
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return gray_pixels;
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}
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/* Get image buffer for a given frame
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*
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* Frame is in clip space.
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*/
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static ImBuf *tracking_context_get_frame_ibuf(MovieClip *clip, MovieClipUser *user, int clip_flag, int framenr)
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{
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ImBuf *ibuf;
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MovieClipUser new_user = *user;
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new_user.framenr = BKE_movieclip_remap_clip_to_scene_frame(clip, framenr);
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ibuf = BKE_movieclip_get_ibuf_flag(clip, &new_user, clip_flag, MOVIECLIP_CACHE_SKIP);
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return ibuf;
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}
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/* Get image buffer for previous marker's keyframe. */
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static ImBuf *tracking_context_get_keyframed_ibuf(MovieClip *clip, MovieClipUser *user, int clip_flag,
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MovieTrackingTrack *track, int curfra, bool backwards,
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MovieTrackingMarker **marker_keyed_r)
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{
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MovieTrackingMarker *marker_keyed;
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int keyed_framenr;
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marker_keyed = tracking_get_keyframed_marker(track, curfra, backwards);
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if (marker_keyed == NULL) {
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return NULL;
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}
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keyed_framenr = marker_keyed->framenr;
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*marker_keyed_r = marker_keyed;
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return tracking_context_get_frame_ibuf(clip, user, clip_flag, keyed_framenr);
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}
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/* Get image buffer which si used as referece for track. */
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static ImBuf *tracking_context_get_reference_ibuf(MovieClip *clip, MovieClipUser *user, int clip_flag,
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MovieTrackingTrack *track, int curfra, bool backwards,
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MovieTrackingMarker **reference_marker)
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{
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ImBuf *ibuf = NULL;
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if (track->pattern_match == TRACK_MATCH_KEYFRAME) {
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ibuf = tracking_context_get_keyframed_ibuf(clip, user, clip_flag, track, curfra, backwards, reference_marker);
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}
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else {
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ibuf = tracking_context_get_frame_ibuf(clip, user, clip_flag, curfra);
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/* use current marker as keyframed position */
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*reference_marker = BKE_tracking_marker_get(track, curfra);
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}
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return ibuf;
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}
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/* Fill in libmv tracker options structure with settings need to be used to perform track. */
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void tracking_configure_tracker(const MovieTrackingTrack *track, float *mask,
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libmv_TrackRegionOptions *options)
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{
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options->motion_model = track->motion_model;
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options->use_brute = ((track->algorithm_flag & TRACK_ALGORITHM_FLAG_USE_BRUTE) != 0);
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options->use_normalization = ((track->algorithm_flag & TRACK_ALGORITHM_FLAG_USE_NORMALIZATION) != 0);
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options->num_iterations = 50;
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options->minimum_correlation = track->minimum_correlation;
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options->sigma = 0.9;
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if ((track->algorithm_flag & TRACK_ALGORITHM_FLAG_USE_MASK) != 0)
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options->image1_mask = mask;
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else
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options->image1_mask = NULL;
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}
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/* Perform tracking from a reference_marker to destination_ibuf.
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* Uses marker as an initial position guess.
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*
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* Returns truth if tracker returned success, puts result
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* to dst_pixel_x and dst_pixel_y.
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*/
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static bool configure_and_run_tracker(ImBuf *destination_ibuf, MovieTrackingTrack *track,
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MovieTrackingMarker *reference_marker, MovieTrackingMarker *marker,
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float *reference_search_area, int reference_search_area_width,
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int reference_search_area_height, float *mask,
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double dst_pixel_x[5], double dst_pixel_y[5])
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{
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/* To convert to the x/y split array format for libmv. */
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double src_pixel_x[5], src_pixel_y[5];
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/* Settings for the tracker */
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libmv_TrackRegionOptions options = {0};
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libmv_TrackRegionResult result;
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float *patch_new;
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int new_search_area_width, new_search_area_height;
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int frame_width, frame_height;
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bool tracked;
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frame_width = destination_ibuf->x;
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frame_height = destination_ibuf->y;
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/* for now track to the same search area dimension as marker has got for current frame
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* will make all tracked markers in currently tracked segment have the same search area
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* size, but it's quite close to what is actually needed
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*/
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patch_new = track_get_search_floatbuf(destination_ibuf, track, marker,
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&new_search_area_width, &new_search_area_height);
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/* configure the tracker */
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tracking_configure_tracker(track, mask, &options);
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/* convert the marker corners and center into pixel coordinates in the search/destination images. */
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tracking_get_marker_coords_for_tracking(frame_width, frame_height, reference_marker, src_pixel_x, src_pixel_y);
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tracking_get_marker_coords_for_tracking(frame_width, frame_height, marker, dst_pixel_x, dst_pixel_y);
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if (patch_new == NULL || reference_search_area == NULL)
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return false;
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/* run the tracker! */
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tracked = libmv_trackRegion(&options,
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reference_search_area,
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reference_search_area_width,
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reference_search_area_height,
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patch_new,
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new_search_area_width,
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new_search_area_height,
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src_pixel_x, src_pixel_y,
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&result,
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dst_pixel_x, dst_pixel_y);
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MEM_freeN(patch_new);
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return tracked;
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}
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static bool refine_marker_reference_frame_get(MovieTrackingTrack *track,
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MovieTrackingMarker *marker,
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bool backwards,
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int *reference_framenr)
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{
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const MovieTrackingMarker *first_marker = track->markers;
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const MovieTrackingMarker *last_marker = track->markers + track->markersnr - 1;
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MovieTrackingMarker *reference = backwards ? marker + 1 : marker - 1;
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while (reference >= first_marker &&
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reference <= last_marker &&
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(reference->flag & MARKER_DISABLED) != 0)
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{
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if (backwards)
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reference++;
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else
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reference--;
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}
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if (reference < first_marker ||
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reference > last_marker)
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{
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return false;
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}
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*reference_framenr = reference->framenr;
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return (reference->flag & MARKER_DISABLED) == 0;
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}
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/* Refine marker's position using previously known keyframe.
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* Direction of searching for a keyframe depends on backwards flag,
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* which means if backwards is false, previous keyframe will be as
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* reference.
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*/
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void BKE_tracking_refine_marker(MovieClip *clip, MovieTrackingTrack *track, MovieTrackingMarker *marker, bool backwards)
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{
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MovieTrackingMarker *reference_marker = NULL;
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ImBuf *reference_ibuf, *destination_ibuf;
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float *search_area, *mask = NULL;
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int frame_width, frame_height;
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int search_area_height, search_area_width;
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int clip_flag = clip->flag & MCLIP_TIMECODE_FLAGS;
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int reference_framenr;
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MovieClipUser user = {0};
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double dst_pixel_x[5], dst_pixel_y[5];
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bool tracked;
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/* Construct a temporary clip used, used to acquire image buffers. */
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user.framenr = BKE_movieclip_remap_clip_to_scene_frame(clip, marker->framenr);
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BKE_movieclip_get_size(clip, &user, &frame_width, &frame_height);
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/* Get an image buffer for reference frame, also gets reference marker. */
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if (!refine_marker_reference_frame_get(track,
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marker,
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backwards,
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&reference_framenr))
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{
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return;
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}
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reference_ibuf = tracking_context_get_reference_ibuf(clip, &user, clip_flag, track, reference_framenr,
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backwards, &reference_marker);
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if (reference_ibuf == NULL) {
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return;
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}
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/* Could not refine with self. */
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if (reference_marker == marker) {
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return;
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}
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/* Destination image buffer has got frame number corresponding to refining marker. */
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destination_ibuf = BKE_movieclip_get_ibuf_flag(clip, &user, clip_flag, MOVIECLIP_CACHE_SKIP);
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if (destination_ibuf == NULL) {
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IMB_freeImBuf(reference_ibuf);
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return;
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}
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/* Get search area from reference image. */
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search_area = track_get_search_floatbuf(reference_ibuf, track, reference_marker,
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&search_area_width, &search_area_height);
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/* If needed, compute track's mask. */
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if ((track->algorithm_flag & TRACK_ALGORITHM_FLAG_USE_MASK) != 0)
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mask = BKE_tracking_track_get_mask(frame_width, frame_height, track, marker);
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/* Run the tracker from reference frame to current one. */
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tracked = configure_and_run_tracker(destination_ibuf, track, reference_marker, marker,
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search_area, search_area_width, search_area_height,
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mask, dst_pixel_x, dst_pixel_y);
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/* Refine current marker's position if track was successful. */
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if (tracked) {
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tracking_set_marker_coords_from_tracking(frame_width, frame_height, marker, dst_pixel_x, dst_pixel_y);
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marker->flag |= MARKER_TRACKED;
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}
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/* Free memory used for refining */
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MEM_freeN(search_area);
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if (mask)
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MEM_freeN(mask);
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IMB_freeImBuf(reference_ibuf);
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IMB_freeImBuf(destination_ibuf);
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}
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