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scenechange: improve detection algorithm

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Scene detection determines, how many scenes have changed in a video.

It compared the previous frame with present frame to find out the score and a
threshold is calculated for the same.

I have added an intermediate condition which helps in improving the positive
detections.

https://bugzilla.gnome.org/show_bug.cgi?id=735094
This commit is contained in:
Vineeth T M 2014-10-27 09:41:51 +05:30 committed by Olivier Crête
parent cb1eb650c6
commit 0869c06f9d
1 changed files with 9 additions and 2 deletions
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11
gst/videofilters/gstscenechange.c
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@ -218,12 +218,15 @@ gst_scene_change_transform_frame_ip (GstVideoFilter * filter,
threshold = 1.8 * score_max - 0.8 * score_min;
if (scenechange->n_diffs > 2) {
if (scenechange->n_diffs > (SC_N_DIFFS - 1)) {
if (score < 5) {
change = FALSE;
} else if (score / threshold < 1.0) {
change = FALSE;
} else if (score / threshold > 2.5) {
} else if ((score > 30)
&& (score / scenechange->diffs[SC_N_DIFFS - 2] > 1.4)) {
change = TRUE;
} else if (score / threshold > 2.3) {
change = TRUE;
} else if (score > 50) {
change = TRUE;
@ -234,6 +237,10 @@ gst_scene_change_transform_frame_ip (GstVideoFilter * filter,
change = FALSE;
}
if (change == TRUE) {
memset (scenechange->diffs, 0, sizeof (double) * SC_N_DIFFS);
scenechange->n_diffs = 0;
}
#ifdef TESTING
if (change != is_shot_change (scenechange->n_diffs)) {
g_print ("%d %g %g %g %d\n", scenechange->n_diffs, score / threshold,