mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-09-09 05:38:58 +00:00
639 lines
23 KiB
C++
639 lines
23 KiB
C++
/*
|
|
* GStreamer hand gesture detection plugins
|
|
* Copyright (C) 2012 Andol Li <<andol@andol.info>>
|
|
* Copyright (C) 2013 Sreerenj Balachandran <sreerenj.balachandran@intel.com>
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
* DEALINGS IN THE SOFTWARE.
|
|
*
|
|
* Alternatively, the contents of this file may be used under the
|
|
* GNU Lesser General Public License Version 2.1 (the "LGPL"), in
|
|
* which case the following provisions apply instead of the ones
|
|
* mentioned above:
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 02111-1307, USA.
|
|
*/
|
|
/**
|
|
* SECTION:video-filter-handdetect
|
|
*
|
|
* FIXME:operates hand gesture detection in video streams and images,
|
|
* and enable media operation e.g. play/stop/fast forward/back rewind.
|
|
*
|
|
* ## Example launch line
|
|
*
|
|
* |[
|
|
* gst-launch-1.0 autovideosrc ! videoconvert ! "video/x-raw, format=RGB, width=320, height=240" ! \
|
|
* videoscale ! handdetect ! videoconvert ! xvimagesink
|
|
* ]|
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
|
|
/* element header */
|
|
#include "gsthanddetect.h"
|
|
#include <opencv2/imgproc.hpp>
|
|
|
|
GST_DEBUG_CATEGORY_STATIC (gst_handdetect_debug);
|
|
#define GST_CAT_DEFAULT gst_handdetect_debug
|
|
#if (CV_MAJOR_VERSION < 4)
|
|
#define CASCADE_DO_CANNY_PRUNING CV_HAAR_DO_CANNY_PRUNING
|
|
#endif
|
|
|
|
/* define HAAR files */
|
|
#define HAAR_FILE_FIST GST_HAAR_CASCADES_DIR G_DIR_SEPARATOR_S "fist.xml"
|
|
#define HAAR_FILE_PALM GST_HAAR_CASCADES_DIR G_DIR_SEPARATOR_S "palm.xml"
|
|
|
|
using namespace cv;
|
|
using namespace std;
|
|
/* Filter signals and args */
|
|
enum
|
|
{
|
|
/* FILL ME */
|
|
LAST_SIGNAL
|
|
};
|
|
|
|
enum
|
|
{
|
|
PROP_0,
|
|
PROP_DISPLAY,
|
|
PROP_PROFILE_FIST,
|
|
PROP_PROFILE_PALM,
|
|
PROP_ROI_X,
|
|
PROP_ROI_Y,
|
|
PROP_ROI_WIDTH,
|
|
PROP_ROI_HEIGHT
|
|
};
|
|
|
|
/* the capabilities of the inputs and outputs */
|
|
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
|
|
GST_PAD_SINK,
|
|
GST_PAD_ALWAYS,
|
|
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("RGB"))
|
|
);
|
|
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
|
|
GST_PAD_SRC,
|
|
GST_PAD_ALWAYS,
|
|
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("RGB"))
|
|
);
|
|
|
|
static void gst_handdetect_set_property (GObject * object, guint prop_id,
|
|
const GValue * value, GParamSpec * pspec);
|
|
static void gst_handdetect_get_property (GObject * object, guint prop_id,
|
|
GValue * value, GParamSpec * pspec);
|
|
static gboolean gst_handdetect_set_caps (GstOpencvVideoFilter * transform,
|
|
gint in_width, gint in_height, int in_cv_type,
|
|
gint out_width, gint out_height, int out_cv_type);
|
|
static GstFlowReturn gst_handdetect_transform_ip (GstOpencvVideoFilter *
|
|
transform, GstBuffer * buffer, Mat img);
|
|
|
|
static CascadeClassifier *gst_handdetect_load_profile (GstHanddetect * filter,
|
|
gchar * profile);
|
|
|
|
static void gst_handdetect_navigation_interface_init (GstNavigationInterface *
|
|
iface);
|
|
static void gst_handdetect_navigation_send_event (GstNavigation * navigation,
|
|
GstStructure * structure);
|
|
|
|
G_DEFINE_TYPE_WITH_CODE (GstHanddetect, gst_handdetect,
|
|
GST_TYPE_OPENCV_VIDEO_FILTER,
|
|
G_IMPLEMENT_INTERFACE (GST_TYPE_NAVIGATION,
|
|
gst_handdetect_navigation_interface_init););
|
|
|
|
static void
|
|
gst_handdetect_navigation_interface_init (GstNavigationInterface * iface)
|
|
{
|
|
iface->send_event = gst_handdetect_navigation_send_event;
|
|
}
|
|
|
|
/* FIXME: this function used to parse the region of interests coordinates
|
|
* sending from applications when the hand gestures reach the defined regions of interests,
|
|
* at this moment this function is not doing anything significantly
|
|
* but will be CHANGED when the gstreamer is patched with new hand gesture events
|
|
*/
|
|
static void
|
|
gst_handdetect_navigation_send_event (GstNavigation * navigation,
|
|
GstStructure * structure)
|
|
{
|
|
GstHanddetect *filter = GST_HANDDETECT (navigation);
|
|
GstPad *peer;
|
|
|
|
if ((peer = gst_pad_get_peer (GST_BASE_TRANSFORM_CAST (filter)->sinkpad))) {
|
|
GstEvent *event;
|
|
event = gst_event_new_navigation (structure);
|
|
gst_pad_send_event (peer, event);
|
|
gst_object_unref (peer);
|
|
}
|
|
}
|
|
|
|
/* clean opencv images and parameters */
|
|
static void
|
|
gst_handdetect_finalize (GObject * obj)
|
|
{
|
|
GstHanddetect *filter = GST_HANDDETECT (obj);
|
|
|
|
filter->cvGray.release ();
|
|
g_free (filter->profile_fist);
|
|
g_free (filter->profile_palm);
|
|
delete (filter->best_r);
|
|
if (filter->cvCascade_fist)
|
|
delete filter->cvCascade_fist;
|
|
if (filter->cvCascade_palm)
|
|
delete filter->cvCascade_palm;
|
|
|
|
G_OBJECT_CLASS (gst_handdetect_parent_class)->finalize (obj);
|
|
}
|
|
|
|
/* initialise the HANDDETECT class */
|
|
static void
|
|
gst_handdetect_class_init (GstHanddetectClass * klass)
|
|
{
|
|
GObjectClass *gobject_class;
|
|
GstOpencvVideoFilterClass *gstopencvbasefilter_class;
|
|
|
|
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
|
|
gobject_class = (GObjectClass *) klass;
|
|
gstopencvbasefilter_class = (GstOpencvVideoFilterClass *) klass;
|
|
|
|
gstopencvbasefilter_class->cv_trans_ip_func = gst_handdetect_transform_ip;
|
|
gstopencvbasefilter_class->cv_set_caps = gst_handdetect_set_caps;
|
|
|
|
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_handdetect_finalize);
|
|
gobject_class->set_property = gst_handdetect_set_property;
|
|
gobject_class->get_property = gst_handdetect_get_property;
|
|
|
|
g_object_class_install_property (gobject_class,
|
|
PROP_DISPLAY,
|
|
g_param_spec_boolean ("display",
|
|
"Display",
|
|
"Whether the detected hands are highlighted in output frame",
|
|
TRUE, (GParamFlags) G_PARAM_READWRITE)
|
|
);
|
|
g_object_class_install_property (gobject_class,
|
|
PROP_PROFILE_FIST,
|
|
g_param_spec_string ("profile_fist",
|
|
"Profile_fist",
|
|
"Location of HAAR cascade file (fist gesture)",
|
|
HAAR_FILE_FIST, (GParamFlags) G_PARAM_READWRITE)
|
|
);
|
|
g_object_class_install_property (gobject_class,
|
|
PROP_PROFILE_PALM,
|
|
g_param_spec_string ("profile_palm",
|
|
"Profile_palm",
|
|
"Location of HAAR cascade file (palm gesture)",
|
|
HAAR_FILE_PALM, (GParamFlags) G_PARAM_READWRITE)
|
|
);
|
|
/* FIXME: property name needs fixing */
|
|
g_object_class_install_property (gobject_class,
|
|
PROP_ROI_X,
|
|
g_param_spec_int ("ROI_X",
|
|
"ROI_X",
|
|
"X of left-top pointer in region of interest \nGestures in the defined region of interest will emit messages",
|
|
0, INT_MAX, 0, (GParamFlags) G_PARAM_READWRITE)
|
|
);
|
|
/* FIXME: property name needs fixing */
|
|
g_object_class_install_property (gobject_class,
|
|
PROP_ROI_Y,
|
|
g_param_spec_int ("ROI_Y",
|
|
"ROI_Y",
|
|
"Y of left-top pointer in region of interest \nGestures in the defined region of interest will emit messages",
|
|
0, INT_MAX, 0, (GParamFlags) G_PARAM_READWRITE)
|
|
);
|
|
/* FIXME: property name needs fixing */
|
|
g_object_class_install_property (gobject_class,
|
|
PROP_ROI_WIDTH,
|
|
g_param_spec_int ("ROI_WIDTH",
|
|
"ROI_WIDTH",
|
|
"WIDTH of left-top pointer in region of interest \nGestures in the defined region of interest will emit messages",
|
|
0, INT_MAX, 0, (GParamFlags) G_PARAM_READWRITE)
|
|
);
|
|
/* FIXME: property name needs fixing */
|
|
g_object_class_install_property (gobject_class,
|
|
PROP_ROI_HEIGHT,
|
|
g_param_spec_int ("ROI_HEIGHT",
|
|
"ROI_HEIGHT",
|
|
"HEIGHT of left-top pointer in region of interest \nGestures in the defined region of interest will emit messages",
|
|
0, INT_MAX, 0, (GParamFlags) G_PARAM_READWRITE)
|
|
);
|
|
|
|
gst_element_class_set_static_metadata (element_class,
|
|
"handdetect",
|
|
"Filter/Effect/Video",
|
|
"Performs hand gesture detection on videos, providing detected hand positions via bus message and navigation event, and deals with hand gesture events",
|
|
"Andol Li <andol@andol.info>");
|
|
|
|
gst_element_class_add_static_pad_template (element_class, &src_factory);
|
|
gst_element_class_add_static_pad_template (element_class, &sink_factory);
|
|
|
|
}
|
|
|
|
/* initialise the new element
|
|
* instantiate pads and add them to element
|
|
* set pad call-back functions
|
|
* initialise instance structure
|
|
*/
|
|
static void
|
|
gst_handdetect_init (GstHanddetect * filter)
|
|
{
|
|
const gchar *haar_path;
|
|
|
|
haar_path = g_getenv ("GST_HAAR_CASCADES_PATH");
|
|
if (haar_path) {
|
|
filter->profile_fist = g_build_filename (haar_path, "fist.xml", NULL);
|
|
filter->profile_palm = g_build_filename (haar_path, "palm.xml", NULL);
|
|
} else {
|
|
filter->profile_fist = g_strdup (HAAR_FILE_FIST);
|
|
filter->profile_palm = g_strdup (HAAR_FILE_PALM);
|
|
}
|
|
|
|
filter->roi_x = 0;
|
|
filter->roi_y = 0;
|
|
filter->roi_width = 0;
|
|
filter->roi_height = 0;
|
|
filter->display = TRUE;
|
|
|
|
filter->cvCascade_fist =
|
|
gst_handdetect_load_profile (filter, filter->profile_fist);
|
|
filter->cvCascade_palm =
|
|
gst_handdetect_load_profile (filter, filter->profile_palm);
|
|
|
|
gst_opencv_video_filter_set_in_place (GST_OPENCV_VIDEO_FILTER_CAST (filter),
|
|
TRUE);
|
|
}
|
|
|
|
static void
|
|
gst_handdetect_set_property (GObject * object, guint prop_id,
|
|
const GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstHanddetect *filter = GST_HANDDETECT (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_PROFILE_FIST:
|
|
g_free (filter->profile_fist);
|
|
if (filter->cvCascade_fist)
|
|
delete filter->cvCascade_fist;
|
|
filter->profile_fist = g_value_dup_string (value);
|
|
filter->cvCascade_fist =
|
|
gst_handdetect_load_profile (filter, filter->profile_fist);
|
|
break;
|
|
case PROP_PROFILE_PALM:
|
|
g_free (filter->profile_palm);
|
|
if (filter->cvCascade_palm)
|
|
delete filter->cvCascade_palm;
|
|
filter->profile_palm = g_value_dup_string (value);
|
|
filter->cvCascade_palm =
|
|
gst_handdetect_load_profile (filter, filter->profile_palm);
|
|
break;
|
|
case PROP_DISPLAY:
|
|
filter->display = g_value_get_boolean (value);
|
|
break;
|
|
case PROP_ROI_X:
|
|
filter->roi_x = g_value_get_int (value);
|
|
break;
|
|
case PROP_ROI_Y:
|
|
filter->roi_y = g_value_get_int (value);
|
|
break;
|
|
case PROP_ROI_WIDTH:
|
|
filter->roi_width = g_value_get_int (value);
|
|
break;
|
|
case PROP_ROI_HEIGHT:
|
|
filter->roi_height = g_value_get_int (value);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_handdetect_get_property (GObject * object, guint prop_id, GValue * value,
|
|
GParamSpec * pspec)
|
|
{
|
|
GstHanddetect *filter = GST_HANDDETECT (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_DISPLAY:
|
|
g_value_set_boolean (value, filter->display);
|
|
break;
|
|
case PROP_PROFILE_FIST:
|
|
g_value_set_string (value, filter->profile_fist);
|
|
break;
|
|
case PROP_PROFILE_PALM:
|
|
g_value_set_string (value, filter->profile_palm);
|
|
break;
|
|
case PROP_ROI_X:
|
|
g_value_set_int (value, filter->roi_x);
|
|
break;
|
|
case PROP_ROI_Y:
|
|
g_value_set_int (value, filter->roi_y);
|
|
break;
|
|
case PROP_ROI_WIDTH:
|
|
g_value_set_int (value, filter->roi_width);
|
|
break;
|
|
case PROP_ROI_HEIGHT:
|
|
g_value_set_int (value, filter->roi_height);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* GstElement vmethod implementations */
|
|
/* this function handles the link with other elements */
|
|
static gboolean
|
|
gst_handdetect_set_caps (GstOpencvVideoFilter * transform,
|
|
gint in_width, gint in_height, int in_cv_type,
|
|
gint out_width, gint out_height, int out_cv_type)
|
|
{
|
|
GstHanddetect *filter;
|
|
filter = GST_HANDDETECT (transform);
|
|
|
|
/* 320 x 240 is with the best detect accuracy, if not, give info */
|
|
if (in_width != 320 || in_height != 240)
|
|
GST_WARNING_OBJECT (filter,
|
|
"resize to 320 x 240 to have best detect accuracy.\n");
|
|
|
|
filter->cvGray.create (Size (in_width, in_height), CV_8UC1);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* Hand detection function
|
|
* This function does the actual processing 'of hand detect and display'
|
|
*/
|
|
static GstFlowReturn
|
|
gst_handdetect_transform_ip (GstOpencvVideoFilter * transform,
|
|
GstBuffer * buffer, Mat img)
|
|
{
|
|
GstHanddetect *filter = GST_HANDDETECT (transform);
|
|
Rect *r;
|
|
GstStructure *s;
|
|
GstMessage *m;
|
|
unsigned int i;
|
|
vector < Rect > hands;
|
|
|
|
/* check detection cascades */
|
|
if (filter->cvCascade_fist && filter->cvCascade_palm) {
|
|
/* cvt to gray colour space for hand detect */
|
|
cvtColor (img, filter->cvGray, COLOR_RGB2GRAY);
|
|
|
|
/* detect FIST gesture fist */
|
|
Mat roi (filter->cvGray, Rect (0,
|
|
0, filter->cvGray.size ().width, filter->cvGray.size ().height));
|
|
filter->cvCascade_fist->detectMultiScale (roi, hands, 1.1, 2,
|
|
CASCADE_DO_CANNY_PRUNING, Size (24, 24), Size (0, 0));
|
|
|
|
/* if FIST gesture detected */
|
|
if (!hands.empty ()) {
|
|
|
|
int min_distance, distance;
|
|
Rect temp_r;
|
|
Point c;
|
|
|
|
/* Go through all detected FIST gestures to get the best one
|
|
* prev_r => previous hand
|
|
* best_r => best hand in this frame
|
|
*/
|
|
/* set min_distance for init comparison */
|
|
min_distance = img.size ().width + img.size ().height;
|
|
/* Init filter->prev_r */
|
|
temp_r = Rect (0, 0, 0, 0);
|
|
if (filter->prev_r == NULL)
|
|
filter->prev_r = &temp_r;
|
|
/* Get the best FIST gesture */
|
|
for (i = 0; i < hands.size (); i++) {
|
|
r = &hands[i];
|
|
distance = (int) sqrt (pow ((r->x - filter->prev_r->x),
|
|
2) + pow ((r->y - filter->prev_r->y), 2));
|
|
if (distance <= min_distance) {
|
|
min_distance = distance;
|
|
delete (filter->best_r);
|
|
filter->best_r = new Rect (*r);
|
|
}
|
|
}
|
|
/* Save best_r as prev_r for next frame comparison */
|
|
filter->prev_r = filter->best_r;
|
|
|
|
/* send msg to app/bus if the detected gesture falls in the region of interest */
|
|
/* get center point of gesture */
|
|
c = Point (filter->best_r->x + filter->best_r->width / 2,
|
|
filter->best_r->y + filter->best_r->height / 2);
|
|
/* send message:
|
|
* if the center point is in the region of interest, OR,
|
|
* if the region of interest remains default as (0,0,0,0)*/
|
|
if ((c.x >= filter->roi_x && c.x <= (filter->roi_x + filter->roi_width)
|
|
&& c.y >= filter->roi_y
|
|
&& c.y <= (filter->roi_y + filter->roi_height))
|
|
|| (filter->roi_x == 0
|
|
&& filter->roi_y == 0
|
|
&& filter->roi_width == 0 && filter->roi_height == 0)) {
|
|
/* Define structure for message post */
|
|
s = gst_structure_new ("hand-gesture",
|
|
"gesture", G_TYPE_STRING, "fist",
|
|
"x", G_TYPE_INT,
|
|
(gint) (filter->best_r->x + filter->best_r->width * 0.5), "y",
|
|
G_TYPE_INT,
|
|
(gint) (filter->best_r->y + filter->best_r->height * 0.5), "width",
|
|
G_TYPE_INT, (gint) filter->best_r->width, "height", G_TYPE_INT,
|
|
(gint) filter->best_r->height, NULL);
|
|
/* Init message element */
|
|
m = gst_message_new_element (GST_OBJECT (filter), s);
|
|
/* Send message */
|
|
gst_element_post_message (GST_ELEMENT (filter), m);
|
|
|
|
#if 0
|
|
/* send event
|
|
* here we use mouse-move event instead of fist-move or palm-move event
|
|
* !!! this will CHANGE in the future !!!
|
|
* !!! by adding gst_navigation_send_hand_detect_event() in navigation.c !!!
|
|
*/
|
|
gst_navigation_send_mouse_event (GST_NAVIGATION (filter),
|
|
"mouse-move",
|
|
0,
|
|
(double) (filter->best_r->x + filter->best_r->width * 0.5),
|
|
(double) (filter->best_r->y + filter->best_r->height * 0.5));
|
|
|
|
#endif
|
|
}
|
|
/* Check filter->display,
|
|
* If TRUE, displaying red circle marker in the out frame */
|
|
if (filter->display) {
|
|
Point center;
|
|
int radius;
|
|
center.x = cvRound ((filter->best_r->x + filter->best_r->width * 0.5));
|
|
center.y = cvRound ((filter->best_r->y + filter->best_r->height * 0.5));
|
|
radius =
|
|
cvRound ((filter->best_r->width + filter->best_r->height) * 0.25);
|
|
circle (img, center, radius, CV_RGB (0, 0, 200), 1, 8, 0);
|
|
}
|
|
} else {
|
|
/* if NO FIST gesture, detecting PALM gesture */
|
|
filter->cvCascade_palm->detectMultiScale (roi, hands, 1.1, 2,
|
|
CASCADE_DO_CANNY_PRUNING, Size (24, 24), Size (0, 0));
|
|
/* if PALM detected */
|
|
if (!hands.empty ()) {
|
|
int min_distance, distance;
|
|
Rect temp_r;
|
|
Point c;
|
|
|
|
if (filter->display) {
|
|
GST_DEBUG_OBJECT (filter, "%d PALM gestures detected",
|
|
(int) hands.size ());
|
|
}
|
|
/* Go through all detected PALM gestures to get the best one
|
|
* prev_r => previous hand
|
|
* best_r => best hand in this frame
|
|
*/
|
|
/* suppose a min_distance for init comparison */
|
|
min_distance = img.size ().width + img.size ().height;
|
|
/* Init filter->prev_r */
|
|
temp_r = Rect (0, 0, 0, 0);
|
|
if (filter->prev_r == NULL)
|
|
filter->prev_r = &temp_r;
|
|
/* Get the best PALM gesture */
|
|
for (i = 0; i < hands.size (); ++i) {
|
|
r = &hands[i];
|
|
distance = (int) sqrt (pow ((r->x - filter->prev_r->x),
|
|
2) + pow ((r->y - filter->prev_r->y), 2));
|
|
if (distance <= min_distance) {
|
|
min_distance = distance;
|
|
delete (filter->best_r);
|
|
filter->best_r = new Rect (*r);
|
|
}
|
|
}
|
|
/* Save best_r as prev_r for next frame comparison */
|
|
filter->prev_r = filter->best_r;
|
|
|
|
/* send msg to app/bus if the detected gesture falls in the region of interest */
|
|
/* get center point of gesture */
|
|
c = Point (filter->best_r->x + filter->best_r->width / 2,
|
|
filter->best_r->y + filter->best_r->height / 2);
|
|
/* send message:
|
|
* if the center point is in the region of interest, OR,
|
|
* if the region of interest remains default as (0,0,0,0)*/
|
|
if (((gint) c.x >= filter->roi_x
|
|
&& (gint) c.x <= (filter->roi_x + filter->roi_width)
|
|
&& (gint) c.y >= filter->roi_y
|
|
&& (gint) c.y <= (filter->roi_y + filter->roi_height))
|
|
|| (filter->roi_x == 0 && filter->roi_y == 0
|
|
&& filter->roi_width == 0 && filter->roi_height == 0)) {
|
|
/* Define structure for message post */
|
|
s = gst_structure_new ("hand-gesture",
|
|
"gesture", G_TYPE_STRING, "palm",
|
|
"x", G_TYPE_INT,
|
|
(gint) (filter->best_r->x + filter->best_r->width * 0.5), "y",
|
|
G_TYPE_INT,
|
|
(gint) (filter->best_r->y + filter->best_r->height * 0.5),
|
|
"width", G_TYPE_INT, (gint) filter->best_r->width, "height",
|
|
G_TYPE_INT, (gint) filter->best_r->height, NULL);
|
|
/* Init message element */
|
|
m = gst_message_new_element (GST_OBJECT (filter), s);
|
|
/* Send message */
|
|
gst_element_post_message (GST_ELEMENT (filter), m);
|
|
|
|
#if 0
|
|
/* send event
|
|
* here we use mouse-move event instead of fist-move or palm-move event
|
|
* !!! this will CHANGE in the future !!!
|
|
* !!! by adding gst_navigation_send_hand_detect_event() in navigation.c !!!
|
|
*/
|
|
gst_navigation_send_mouse_event (GST_NAVIGATION (filter),
|
|
"mouse-move",
|
|
0,
|
|
(double) (filter->best_r->x + filter->best_r->width * 0.5),
|
|
(double) (filter->best_r->y + filter->best_r->height * 0.5));
|
|
|
|
/* or use another way to send upstream navigation event for debug
|
|
*
|
|
* GstEvent *event =
|
|
* gst_event_new_navigation (gst_structure_new
|
|
* ("application/x-gst-navigation", "event", G_TYPE_STRING,
|
|
* "mouse-move",
|
|
* "button", G_TYPE_INT, 0,
|
|
* "pointer_x", G_TYPE_DOUBLE,
|
|
* (double) (filter->best_r->x + filter->best_r->width * 0.5),
|
|
* "pointer_y", G_TYPE_DOUBLE,
|
|
* (double) (filter->best_r->y + filter->best_r->height * 0.5),
|
|
* NULL));
|
|
* gst_pad_send_event (GST_BASE_TRANSFORM_CAST (filter)->srcpad, event);
|
|
*/
|
|
#endif
|
|
}
|
|
/* Check filter->display,
|
|
* If TRUE, displaying red circle marker in the out frame */
|
|
if (filter->display) {
|
|
Point center;
|
|
int radius;
|
|
center.x =
|
|
cvRound ((filter->best_r->x + filter->best_r->width * 0.5));
|
|
center.y =
|
|
cvRound ((filter->best_r->y + filter->best_r->height * 0.5));
|
|
radius =
|
|
cvRound ((filter->best_r->width + filter->best_r->height) * 0.25);
|
|
circle (img, center, radius, CV_RGB (0, 0, 200), 1, 8, 0);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Push out the incoming buffer */
|
|
return GST_FLOW_OK;
|
|
}
|
|
|
|
static CascadeClassifier *
|
|
gst_handdetect_load_profile (GstHanddetect * filter, gchar * profile)
|
|
{
|
|
CascadeClassifier *cascade;
|
|
|
|
cascade = new CascadeClassifier (profile);
|
|
if (cascade->empty ()) {
|
|
GST_ERROR_OBJECT (filter, "Invalid profile file: %s", profile);
|
|
delete cascade;
|
|
return NULL;
|
|
}
|
|
|
|
return cascade;
|
|
}
|
|
|
|
/* Entry point to initialize the plug-in
|
|
* Initialize the plug-in itself
|
|
* Register the element factories and other features
|
|
*/
|
|
gboolean
|
|
gst_handdetect_plugin_init (GstPlugin * plugin)
|
|
{
|
|
GST_DEBUG_CATEGORY_INIT (gst_handdetect_debug,
|
|
"handdetect", 0, "opencv hand gesture detection");
|
|
return gst_element_register (plugin, "handdetect", GST_RANK_NONE,
|
|
GST_TYPE_HANDDETECT);
|
|
}
|