gstreamer/ext/opencv/gstedgedetect.cpp

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/*
* GStreamer
* Copyright (C) 2005 Thomas Vander Stichele <thomas@apestaart.org>
* Copyright (C) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
* Copyright (C) 2008 Michael Sheldon <mike@mikeasoft.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-edgedetect
*
* Performs canny edge detection on videos and images
*
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* ## Example launch line
*
* |[
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* gst-launch-1.0 videotestsrc ! videoconvert ! edgedetect ! videoconvert ! xvimagesink
* ]|
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "gstedgedetect.h"
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#include <opencv2/imgproc.hpp>
GST_DEBUG_CATEGORY_STATIC (gst_edge_detect_debug);
#define GST_CAT_DEFAULT gst_edge_detect_debug
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_THRESHOLD1,
PROP_THRESHOLD2,
PROP_APERTURE,
PROP_MASK
};
/* the capabilities of the inputs and outputs.
*
* describe the real formats here.
*/
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"))
);
G_DEFINE_TYPE (GstEdgeDetect, gst_edge_detect, GST_TYPE_OPENCV_VIDEO_FILTER);
static void gst_edge_detect_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_edge_detect_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstFlowReturn gst_edge_detect_transform (GstOpencvVideoFilter * filter,
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GstBuffer * buf, cv::Mat img, GstBuffer * outbuf, cv::Mat outimg);
static gboolean gst_edge_detect_set_caps (GstOpencvVideoFilter * transform,
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gint in_width, gint in_height, int in_cv_type,
gint out_width, gint out_height, int out_cv_type);
/* Clean up */
static void
gst_edge_detect_finalize (GObject * obj)
{
GstEdgeDetect *filter = GST_EDGE_DETECT (obj);
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filter->cvGray.release ();
filter->cvEdge.release ();
G_OBJECT_CLASS (gst_edge_detect_parent_class)->finalize (obj);
}
/* initialize the edgedetect's class */
static void
gst_edge_detect_class_init (GstEdgeDetectClass * klass)
{
GObjectClass *gobject_class;
GstOpencvVideoFilterClass *gstopencvbasefilter_class;
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gobject_class = (GObjectClass *) klass;
gstopencvbasefilter_class = (GstOpencvVideoFilterClass *) klass;
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_edge_detect_finalize);
gobject_class->set_property = gst_edge_detect_set_property;
gobject_class->get_property = gst_edge_detect_get_property;
gstopencvbasefilter_class->cv_trans_func = gst_edge_detect_transform;
gstopencvbasefilter_class->cv_set_caps = gst_edge_detect_set_caps;
g_object_class_install_property (gobject_class, PROP_MASK,
g_param_spec_boolean ("mask", "Mask",
"Sets whether the detected edges should be used as a mask on the original input or not",
TRUE, (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
g_object_class_install_property (gobject_class, PROP_THRESHOLD1,
g_param_spec_int ("threshold1", "Threshold1",
"Threshold value for canny edge detection", 0, 1000, 50,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
g_object_class_install_property (gobject_class, PROP_THRESHOLD2,
g_param_spec_int ("threshold2", "Threshold2",
"Second threshold value for canny edge detection", 0, 1000, 150,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
g_object_class_install_property (gobject_class, PROP_APERTURE,
g_param_spec_int ("aperture", "Aperture",
"Aperture size for Sobel operator (Must be either 3, 5 or 7", 3, 7, 3,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
gst_element_class_set_static_metadata (element_class,
"edgedetect",
"Filter/Effect/Video",
"Performs canny edge detection on videos and images.",
"Michael Sheldon <mike@mikeasoft.com>");
gst_element_class_add_static_pad_template (element_class, &src_factory);
gst_element_class_add_static_pad_template (element_class, &sink_factory);
}
/* initialize the new element
* instantiate pads and add them to element
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* set pad callback functions
* initialize instance structure
*/
static void
gst_edge_detect_init (GstEdgeDetect * filter)
{
filter->mask = TRUE;
filter->threshold1 = 50;
filter->threshold2 = 150;
filter->aperture = 3;
gst_opencv_video_filter_set_in_place (GST_OPENCV_VIDEO_FILTER_CAST (filter),
FALSE);
}
static void
gst_edge_detect_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstEdgeDetect *filter = GST_EDGE_DETECT (object);
switch (prop_id) {
case PROP_MASK:
filter->mask = g_value_get_boolean (value);
break;
case PROP_THRESHOLD1:
filter->threshold1 = g_value_get_int (value);
break;
case PROP_THRESHOLD2:
filter->threshold2 = g_value_get_int (value);
break;
case PROP_APERTURE:
filter->aperture = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_edge_detect_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstEdgeDetect *filter = GST_EDGE_DETECT (object);
switch (prop_id) {
case PROP_MASK:
g_value_set_boolean (value, filter->mask);
break;
case PROP_THRESHOLD1:
g_value_set_int (value, filter->threshold1);
break;
case PROP_THRESHOLD2:
g_value_set_int (value, filter->threshold2);
break;
case PROP_APERTURE:
g_value_set_int (value, filter->aperture);
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_edge_detect_set_caps (GstOpencvVideoFilter * transform,
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gint in_width, gint in_height, int in_cv_type,
gint out_width, gint out_height, int out_cv_type)
{
GstEdgeDetect *filter = GST_EDGE_DETECT (transform);
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filter->cvGray.create (cv::Size (in_width, in_height), CV_8UC1);
filter->cvEdge.create (cv::Size (in_width, in_height), CV_8UC1);
return TRUE;
}
static GstFlowReturn
gst_edge_detect_transform (GstOpencvVideoFilter * base, GstBuffer * buf,
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cv::Mat img, GstBuffer * outbuf, cv::Mat outimg)
{
GstEdgeDetect *filter = GST_EDGE_DETECT (base);
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cv::cvtColor (img, filter->cvGray, cv::COLOR_RGB2GRAY);
cv::Canny (filter->cvGray, filter->cvEdge, filter->threshold1,
filter->threshold2, filter->aperture);
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outimg.setTo (cv::Scalar::all (0));
if (filter->mask) {
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img.copyTo (outimg, filter->cvEdge);
} else {
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cv::cvtColor (filter->cvEdge, outimg, cv::COLOR_GRAY2RGB);
}
return GST_FLOW_OK;
}
/* entry point to initialize the plug-in
* initialize the plug-in itself
* register the element factories and other features
*/
gboolean
gst_edge_detect_plugin_init (GstPlugin * plugin)
{
/* debug category for fltering log messages */
GST_DEBUG_CATEGORY_INIT (gst_edge_detect_debug, "edgedetect",
0, "Performs canny edge detection on videos and images");
return gst_element_register (plugin, "edgedetect", GST_RANK_NONE,
GST_TYPE_EDGE_DETECT);
}