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facedetect: Add new property min-stddev

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face detection will be performed only if image standard deviation is
greater that min-stddev. Default min-stddev is 0 for backward
compatibility. This property will avoid to perform face detection on
images with little changes improving cpu usage and reducing false
positives

https://bugzilla.gnome.org/show_bug.cgi?id=730510
This commit is contained in:
Nicola Murino 2014-09-05 08:51:30 +02:00 committed by Sebastian Dröge
parent f1b026c480
commit 3a0a4a8d70
2 changed files with 37 additions and 6 deletions
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42
ext/opencv/gstfacedetect.c
View file

@ -97,6 +97,7 @@ GST_DEBUG_CATEGORY_STATIC (gst_face_detect_debug);
#define DEFAULT_MIN_NEIGHBORS 3
#define DEFAULT_MIN_SIZE_WIDTH 30
#define DEFAULT_MIN_SIZE_HEIGHT 30
#define DEFAULT_MIN_STDDEV 0
/* Filter signals and args */
enum
@ -118,7 +119,8 @@ enum
PROP_FLAGS,
PROP_MIN_SIZE_WIDTH,
PROP_MIN_SIZE_HEIGHT,
PROP_UPDATES
PROP_UPDATES,
PROP_MIN_STDDEV
};
@ -306,6 +308,14 @@ gst_face_detect_class_init (GstFaceDetectClass * klass)
"When send update bus messages, if at all",
GST_TYPE_FACE_DETECT_UPDATES, GST_FACEDETECT_UPDATES_EVERY_FRAME,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MIN_STDDEV,
g_param_spec_int ("min-stddev", "Minimum image standard deviation",
"Minimum image average standard deviation: on images with standard "
"deviation lesser than this value facedetection will not be "
"performed. Setting this property help to save cpu and reduce "
"false positives not performing face detection on images with "
"little changes", 0,
255, DEFAULT_MIN_STDDEV, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_static_metadata (element_class,
"facedetect",
@ -336,6 +346,7 @@ gst_face_detect_init (GstFaceDetect * filter)
filter->flags = DEFAULT_FLAGS;
filter->min_size_width = DEFAULT_MIN_SIZE_WIDTH;
filter->min_size_height = DEFAULT_MIN_SIZE_HEIGHT;
filter->min_stddev = DEFAULT_MIN_STDDEV;
filter->cvFaceDetect =
gst_face_detect_load_profile (filter, filter->face_profile);
filter->cvNoseDetect =
@ -404,6 +415,9 @@ gst_face_detect_set_property (GObject * object, guint prop_id,
case PROP_MIN_SIZE_HEIGHT:
filter->min_size_height = g_value_get_int (value);
break;
case PROP_MIN_STDDEV:
filter->min_stddev = g_value_get_int (value);
break;
case PROP_FLAGS:
filter->flags = g_value_get_flags (value);
break;
@ -450,6 +464,9 @@ gst_face_detect_get_property (GObject * object, guint prop_id,
case PROP_MIN_SIZE_HEIGHT:
g_value_set_int (value, filter->min_size_height);
break;
case PROP_MIN_STDDEV:
g_value_set_int (value, filter->min_stddev);
break;
case PROP_FLAGS:
g_value_set_flags (value, filter->flags);
break;
@ -514,13 +531,26 @@ gst_face_detect_run_detector (GstFaceDetect * filter,
CvHaarClassifierCascade * detector, gint min_size_width,
gint min_size_height)
{
return cvHaarDetectObjects (filter->cvGray, detector,
filter->cvStorage, filter->scale_factor, filter->min_neighbors,
filter->flags, cvSize (min_size_width, min_size_height)
double img_stddev = 0;
if (filter->min_stddev > 0) {
CvScalar mean, stddev;
cvAvgSdv (filter->cvGray, &mean, &stddev, NULL);
img_stddev = stddev.val[0];
}
if (img_stddev >= filter->min_stddev) {
return cvHaarDetectObjects (filter->cvGray, detector,
filter->cvStorage, filter->scale_factor, filter->min_neighbors,
filter->flags, cvSize (min_size_width, min_size_height)
#if (CV_MAJOR_VERSION >= 2) && (CV_MINOR_VERSION >= 2)
, cvSize (0, 0)
, cvSize (0, 0)
#endif
);
);
} else {
GST_LOG_OBJECT (filter,
"Calculated stddev %f lesser than min_stddev %d, detection not performed",
img_stddev, filter->min_stddev);
return cvCreateSeq (0, sizeof (CvSeq), sizeof (CvPoint), filter->cvStorage);
}
}
/*

1
ext/opencv/gstfacedetect.h
View file

@ -103,6 +103,7 @@ struct _GstFaceDetect
gint flags;
gint min_size_width;
gint min_size_height;
gint min_stddev;
gint updates;
IplImage *cvGray;