ext/opencv/gstcvlaplace.cpp - mtk-gst-plugins-bad-debian - Git at Google

 /*
  * GStreamer
  * Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
  *
  * 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-cvlaplace
  *
  * Applies cvLaplace OpenCV function to the image.
  *
  * <refsect2>
  * <title>Example launch line</title>
  * |[
  * gst-launch-1.0 videotestsrc ! cvlaplace ! videoconvert ! autovideosink
  * ]|
  * </refsect2>
  */

 #ifdef HAVE_CONFIG_H
 #  include <config.h>
 #endif

 #include "gstcvlaplace.h"
 #include <opencv2/imgproc/imgproc_c.h>

 GST_DEBUG_CATEGORY_STATIC (gst_cv_laplace_debug);
 #define GST_CAT_DEFAULT gst_cv_laplace_debug

 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"))
     );

 /* Filter signals and args */
 enum
 {
   /* FILL ME */
   LAST_SIGNAL
 };
 enum
 {
   PROP_0,
   PROP_APERTURE_SIZE,
   PROP_SCALE,
   PROP_SHIFT,
   PROP_MASK
 };

 #define DEFAULT_APERTURE_SIZE 3
 #define DEFAULT_SCALE_FACTOR 1.0
 #define DEFAULT_SHIFT 0.0
 #define DEFAULT_MASK TRUE

 G_DEFINE_TYPE (GstCvLaplace, gst_cv_laplace, GST_TYPE_OPENCV_VIDEO_FILTER);

 static void gst_cv_laplace_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec);
 static void gst_cv_laplace_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec);

 static gboolean gst_cv_laplace_handle_sink_event (GstPad * pad,
     GstObject * parent, GstEvent * event);

 static GstFlowReturn gst_cv_laplace_transform (GstOpencvVideoFilter * filter,
     GstBuffer * buf, IplImage * img, GstBuffer * outbuf, IplImage * outimg);

 static gboolean gst_cv_laplace_cv_set_caps (GstOpencvVideoFilter * trans,
     gint in_width, gint in_height, gint in_depth, gint in_channels,
     gint out_width, gint out_height, gint out_depth, gint out_channels);

 /* Clean up */
 static void
 gst_cv_laplace_finalize (GObject * obj)
 {
   GstCvLaplace *filter = GST_CV_LAPLACE (obj);

   if (filter->intermediary_img) {
     cvReleaseImage (&filter->intermediary_img);
     cvReleaseImage (&filter->cvGray);
     cvReleaseImage (&filter->Laplace);
     cvReleaseImage (&filter->CLaplace);
   }

   G_OBJECT_CLASS (gst_cv_laplace_parent_class)->finalize (obj);
 }

 /* initialize the cvlaplace's class */
 static void
 gst_cv_laplace_class_init (GstCvLaplaceClass * 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_cv_laplace_finalize);
   gobject_class->set_property = gst_cv_laplace_set_property;
   gobject_class->get_property = gst_cv_laplace_get_property;

   gstopencvbasefilter_class->cv_trans_func = gst_cv_laplace_transform;
   gstopencvbasefilter_class->cv_set_caps = gst_cv_laplace_cv_set_caps;

   g_object_class_install_property (gobject_class, PROP_APERTURE_SIZE,
       g_param_spec_int ("aperture-size", "aperture size",
           "Size of the extended Laplace Kernel (1, 3, 5 or 7)", 1, 7,
           DEFAULT_APERTURE_SIZE, (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
   g_object_class_install_property (gobject_class, PROP_SCALE,
       g_param_spec_double ("scale", "scale factor",
           "Scale factor", 0.0, G_MAXDOUBLE,
           DEFAULT_SCALE_FACTOR, (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
   g_object_class_install_property (gobject_class, PROP_SHIFT,
       g_param_spec_double ("shift", "Shift",
           "Value added to the scaled source array elements", 0.0, G_MAXDOUBLE,
           DEFAULT_SHIFT, (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
   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",
           DEFAULT_MASK, (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));

   gst_element_class_add_pad_template (element_class,
       gst_static_pad_template_get (&src_factory));
   gst_element_class_add_pad_template (element_class,
       gst_static_pad_template_get (&sink_factory));

   gst_element_class_set_static_metadata (element_class,
       "cvlaplace",
       "Transform/Effect/Video",
       "Applies cvLaplace OpenCV function to the image",
       "Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
 }

 static void
 gst_cv_laplace_init (GstCvLaplace * filter)
 {
   gst_pad_set_event_function (GST_BASE_TRANSFORM_SINK_PAD (filter),
       GST_DEBUG_FUNCPTR (gst_cv_laplace_handle_sink_event));

   filter->aperture_size = DEFAULT_APERTURE_SIZE;
   filter->scale = DEFAULT_SCALE_FACTOR;
   filter->shift = DEFAULT_SHIFT;
   filter->mask = DEFAULT_MASK;

   gst_opencv_video_filter_set_in_place (GST_OPENCV_VIDEO_FILTER_CAST (filter),
       FALSE);
 }

 static gboolean
 gst_cv_laplace_cv_set_caps (GstOpencvVideoFilter * trans, gint in_width,
     gint in_height, gint in_depth, gint in_channels, gint out_width,
     gint out_height, gint out_depth, gint out_channels)
 {
   GstCvLaplace *filter = GST_CV_LAPLACE (trans);

   if (filter->intermediary_img) {
     cvReleaseImage (&filter->intermediary_img);
   }

   filter->intermediary_img =
       cvCreateImage (cvSize (out_width, out_height), IPL_DEPTH_16S, 1);

   return TRUE;
 }

 static void
 gst_cv_laplace_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec)
 {
   GstCvLaplace *filter = GST_CV_LAPLACE (object);

   switch (prop_id) {
     case PROP_APERTURE_SIZE:{
       gint as = g_value_get_int (value);

       if (as % 2 != 1) {
         GST_WARNING_OBJECT (filter, "Invalid value %d for aperture size", as);
       } else
         filter->aperture_size = g_value_get_int (value);
     }
       break;
     case PROP_SCALE:
       filter->scale = g_value_get_double (value);
       break;
     case PROP_SHIFT:
       filter->shift = g_value_get_double (value);
       break;
     case PROP_MASK:
       filter->mask = g_value_get_boolean (value);
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
   }
 }

 static void
 gst_cv_laplace_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec)
 {
   GstCvLaplace *filter = GST_CV_LAPLACE (object);

   switch (prop_id) {
     case PROP_APERTURE_SIZE:
       g_value_set_int (value, filter->aperture_size);
       break;
     case PROP_SCALE:
       g_value_set_double (value, filter->scale);
       break;
     case PROP_SHIFT:
       g_value_set_double (value, filter->shift);
       break;
     case PROP_MASK:
       g_value_set_boolean (value, filter->mask);
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
   }
 }

 static gboolean
 gst_cv_laplace_handle_sink_event (GstPad * pad, GstObject * parent,
     GstEvent * event)
 {
   GstCvLaplace *filter;
   gint width, height;
   GstStructure *structure;
   gboolean res = TRUE;

   filter = GST_CV_LAPLACE (parent);

   switch (GST_EVENT_TYPE (event)) {
     case GST_EVENT_CAPS:
     {
       GstCaps *caps;
       gst_event_parse_caps (event, &caps);

       structure = gst_caps_get_structure (caps, 0);
       gst_structure_get_int (structure, "width", &width);
       gst_structure_get_int (structure, "height", &height);

       if (filter->intermediary_img != NULL) {
         cvReleaseImage (&filter->intermediary_img);
         cvReleaseImage (&filter->CLaplace);
         cvReleaseImage (&filter->cvGray);
         cvReleaseImage (&filter->Laplace);
       }

       filter->CLaplace =
           cvCreateImage (cvSize (width, height), IPL_DEPTH_8U, 3);
       filter->intermediary_img =
           cvCreateImage (cvSize (width, height), IPL_DEPTH_16S, 1);
       filter->cvGray = cvCreateImage (cvSize (width, height), IPL_DEPTH_8U, 1);
       filter->Laplace = cvCreateImage (cvSize (width, height), IPL_DEPTH_8U, 1);
       break;
     }
     default:
       break;
   }

   res = gst_pad_event_default (pad, parent, event);

   return res;
 }

 static GstFlowReturn
 gst_cv_laplace_transform (GstOpencvVideoFilter * base, GstBuffer * buf,
     IplImage * img, GstBuffer * outbuf, IplImage * outimg)
 {
   GstCvLaplace *filter = GST_CV_LAPLACE (base);
   GstMapInfo out_info;

   g_assert (filter->intermediary_img);

   cvCvtColor (img, filter->cvGray, CV_RGB2GRAY);
   cvLaplace (filter->cvGray, filter->intermediary_img, filter->aperture_size);
   cvConvertScale (filter->intermediary_img, filter->Laplace, filter->scale,
       filter->shift);

   cvZero (filter->CLaplace);
   if (filter->mask) {
     cvCopy (img, filter->CLaplace, filter->Laplace);
   } else {
     cvCvtColor (filter->Laplace, filter->CLaplace, CV_GRAY2RGB);
   }

   gst_buffer_map (outbuf, &out_info, GST_MAP_WRITE);
   memcpy (out_info.data, filter->CLaplace->imageData,
       gst_buffer_get_size (outbuf));

   return GST_FLOW_OK;
 }

 gboolean
 gst_cv_laplace_plugin_init (GstPlugin * plugin)
 {
   GST_DEBUG_CATEGORY_INIT (gst_cv_laplace_debug, "cvlaplace", 0, "cvlaplace");

   return gst_element_register (plugin, "cvlaplace", GST_RANK_NONE,
       GST_TYPE_CV_LAPLACE);
 }
	/*
	* GStreamer
	* Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
	*
	* 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-cvlaplace
	*
	* Applies cvLaplace OpenCV function to the image.
	*
	* <refsect2>
	* <title>Example launch line</title>
	* \|[
	* gst-launch-1.0 videotestsrc ! cvlaplace ! videoconvert ! autovideosink
	* ]\|
	* </refsect2>
	*/

	#ifdef HAVE_CONFIG_H
	# include <config.h>
	#endif

	#include "gstcvlaplace.h"
	#include <opencv2/imgproc/imgproc_c.h>

	GST_DEBUG_CATEGORY_STATIC (gst_cv_laplace_debug);
	#define GST_CAT_DEFAULT gst_cv_laplace_debug

	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"))
	);

	/* Filter signals and args */
	enum
	{
	/* FILL ME */
	LAST_SIGNAL
	};
	enum
	{
	PROP_0,
	PROP_APERTURE_SIZE,
	PROP_SCALE,
	PROP_SHIFT,
	PROP_MASK
	};

	#define DEFAULT_APERTURE_SIZE 3
	#define DEFAULT_SCALE_FACTOR 1.0
	#define DEFAULT_SHIFT 0.0
	#define DEFAULT_MASK TRUE

	G_DEFINE_TYPE (GstCvLaplace, gst_cv_laplace, GST_TYPE_OPENCV_VIDEO_FILTER);

	static void gst_cv_laplace_set_property (GObject * object, guint prop_id,
	const GValue * value, GParamSpec * pspec);
	static void gst_cv_laplace_get_property (GObject * object, guint prop_id,
	GValue * value, GParamSpec * pspec);

	static gboolean gst_cv_laplace_handle_sink_event (GstPad * pad,
	GstObject * parent, GstEvent * event);

	static GstFlowReturn gst_cv_laplace_transform (GstOpencvVideoFilter * filter,
	GstBuffer * buf, IplImage * img, GstBuffer * outbuf, IplImage * outimg);

	static gboolean gst_cv_laplace_cv_set_caps (GstOpencvVideoFilter * trans,
	gint in_width, gint in_height, gint in_depth, gint in_channels,
	gint out_width, gint out_height, gint out_depth, gint out_channels);

	/* Clean up */
	static void
	gst_cv_laplace_finalize (GObject * obj)
	{
	GstCvLaplace *filter = GST_CV_LAPLACE (obj);

	if (filter->intermediary_img) {
	cvReleaseImage (&filter->intermediary_img);
	cvReleaseImage (&filter->cvGray);
	cvReleaseImage (&filter->Laplace);
	cvReleaseImage (&filter->CLaplace);
	}

	G_OBJECT_CLASS (gst_cv_laplace_parent_class)->finalize (obj);
	}

	/* initialize the cvlaplace's class */
	static void
	gst_cv_laplace_class_init (GstCvLaplaceClass * 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_cv_laplace_finalize);
	gobject_class->set_property = gst_cv_laplace_set_property;
	gobject_class->get_property = gst_cv_laplace_get_property;

	gstopencvbasefilter_class->cv_trans_func = gst_cv_laplace_transform;
	gstopencvbasefilter_class->cv_set_caps = gst_cv_laplace_cv_set_caps;

	g_object_class_install_property (gobject_class, PROP_APERTURE_SIZE,
	g_param_spec_int ("aperture-size", "aperture size",
	"Size of the extended Laplace Kernel (1, 3, 5 or 7)", 1, 7,
	DEFAULT_APERTURE_SIZE, (GParamFlags) (G_PARAM_READWRITE \| G_PARAM_STATIC_STRINGS)));
	g_object_class_install_property (gobject_class, PROP_SCALE,
	g_param_spec_double ("scale", "scale factor",
	"Scale factor", 0.0, G_MAXDOUBLE,
	DEFAULT_SCALE_FACTOR, (GParamFlags) (G_PARAM_READWRITE \| G_PARAM_STATIC_STRINGS)));
	g_object_class_install_property (gobject_class, PROP_SHIFT,
	g_param_spec_double ("shift", "Shift",
	"Value added to the scaled source array elements", 0.0, G_MAXDOUBLE,
	DEFAULT_SHIFT, (GParamFlags) (G_PARAM_READWRITE \| G_PARAM_STATIC_STRINGS)));
	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",
	DEFAULT_MASK, (GParamFlags) (G_PARAM_READWRITE \| G_PARAM_STATIC_STRINGS)));

	gst_element_class_add_pad_template (element_class,
	gst_static_pad_template_get (&src_factory));
	gst_element_class_add_pad_template (element_class,
	gst_static_pad_template_get (&sink_factory));

	gst_element_class_set_static_metadata (element_class,
	"cvlaplace",
	"Transform/Effect/Video",
	"Applies cvLaplace OpenCV function to the image",
	"Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
	}

	static void
	gst_cv_laplace_init (GstCvLaplace * filter)
	{
	gst_pad_set_event_function (GST_BASE_TRANSFORM_SINK_PAD (filter),
	GST_DEBUG_FUNCPTR (gst_cv_laplace_handle_sink_event));

	filter->aperture_size = DEFAULT_APERTURE_SIZE;
	filter->scale = DEFAULT_SCALE_FACTOR;
	filter->shift = DEFAULT_SHIFT;
	filter->mask = DEFAULT_MASK;

	gst_opencv_video_filter_set_in_place (GST_OPENCV_VIDEO_FILTER_CAST (filter),
	FALSE);
	}

	static gboolean
	gst_cv_laplace_cv_set_caps (GstOpencvVideoFilter * trans, gint in_width,
	gint in_height, gint in_depth, gint in_channels, gint out_width,
	gint out_height, gint out_depth, gint out_channels)
	{
	GstCvLaplace *filter = GST_CV_LAPLACE (trans);

	if (filter->intermediary_img) {
	cvReleaseImage (&filter->intermediary_img);
	}

	filter->intermediary_img =
	cvCreateImage (cvSize (out_width, out_height), IPL_DEPTH_16S, 1);

	return TRUE;
	}

	static void
	gst_cv_laplace_set_property (GObject * object, guint prop_id,
	const GValue * value, GParamSpec * pspec)
	{
	GstCvLaplace *filter = GST_CV_LAPLACE (object);

	switch (prop_id) {
	case PROP_APERTURE_SIZE:{
	gint as = g_value_get_int (value);

	if (as % 2 != 1) {
	GST_WARNING_OBJECT (filter, "Invalid value %d for aperture size", as);
	} else
	filter->aperture_size = g_value_get_int (value);
	}
	break;
	case PROP_SCALE:
	filter->scale = g_value_get_double (value);
	break;
	case PROP_SHIFT:
	filter->shift = g_value_get_double (value);
	break;
	case PROP_MASK:
	filter->mask = g_value_get_boolean (value);
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	}

	static void
	gst_cv_laplace_get_property (GObject * object, guint prop_id,
	GValue * value, GParamSpec * pspec)
	{
	GstCvLaplace *filter = GST_CV_LAPLACE (object);

	switch (prop_id) {
	case PROP_APERTURE_SIZE:
	g_value_set_int (value, filter->aperture_size);
	break;
	case PROP_SCALE:
	g_value_set_double (value, filter->scale);
	break;
	case PROP_SHIFT:
	g_value_set_double (value, filter->shift);
	break;
	case PROP_MASK:
	g_value_set_boolean (value, filter->mask);
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	}

	static gboolean
	gst_cv_laplace_handle_sink_event (GstPad * pad, GstObject * parent,
	GstEvent * event)
	{
	GstCvLaplace *filter;
	gint width, height;
	GstStructure *structure;
	gboolean res = TRUE;

	filter = GST_CV_LAPLACE (parent);

	switch (GST_EVENT_TYPE (event)) {
	case GST_EVENT_CAPS:
	{
	GstCaps *caps;
	gst_event_parse_caps (event, &caps);

	structure = gst_caps_get_structure (caps, 0);
	gst_structure_get_int (structure, "width", &width);
	gst_structure_get_int (structure, "height", &height);

	if (filter->intermediary_img != NULL) {
	cvReleaseImage (&filter->intermediary_img);
	cvReleaseImage (&filter->CLaplace);
	cvReleaseImage (&filter->cvGray);
	cvReleaseImage (&filter->Laplace);
	}

	filter->CLaplace =
	cvCreateImage (cvSize (width, height), IPL_DEPTH_8U, 3);
	filter->intermediary_img =
	cvCreateImage (cvSize (width, height), IPL_DEPTH_16S, 1);
	filter->cvGray = cvCreateImage (cvSize (width, height), IPL_DEPTH_8U, 1);
	filter->Laplace = cvCreateImage (cvSize (width, height), IPL_DEPTH_8U, 1);
	break;
	}
	default:
	break;
	}

	res = gst_pad_event_default (pad, parent, event);

	return res;
	}

	static GstFlowReturn
	gst_cv_laplace_transform (GstOpencvVideoFilter * base, GstBuffer * buf,
	IplImage * img, GstBuffer * outbuf, IplImage * outimg)
	{
	GstCvLaplace *filter = GST_CV_LAPLACE (base);
	GstMapInfo out_info;

	g_assert (filter->intermediary_img);

	cvCvtColor (img, filter->cvGray, CV_RGB2GRAY);
	cvLaplace (filter->cvGray, filter->intermediary_img, filter->aperture_size);
	cvConvertScale (filter->intermediary_img, filter->Laplace, filter->scale,
	filter->shift);

	cvZero (filter->CLaplace);
	if (filter->mask) {
	cvCopy (img, filter->CLaplace, filter->Laplace);
	} else {
	cvCvtColor (filter->Laplace, filter->CLaplace, CV_GRAY2RGB);
	}

	gst_buffer_map (outbuf, &out_info, GST_MAP_WRITE);
	memcpy (out_info.data, filter->CLaplace->imageData,
	gst_buffer_get_size (outbuf));

	return GST_FLOW_OK;
	}

	gboolean
	gst_cv_laplace_plugin_init (GstPlugin * plugin)
	{
	GST_DEBUG_CATEGORY_INIT (gst_cv_laplace_debug, "cvlaplace", 0, "cvlaplace");

	return gst_element_register (plugin, "cvlaplace", GST_RANK_NONE,
	GST_TYPE_CV_LAPLACE);
	}