gstreamer/ext/opencv/gsttemplatematch.c
Luis de Bethencourt 632854eba3 opencv: remove always-true check
filter->cvImage has just been used/dereferenced, there would be an error
there if the pointer was NULL. No need to check since it will always be true.
2015-03-05 15:34:32 +00:00

478 lines
15 KiB
C

/*
* 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>
* Copyright (C) 2009 Noam Lewis <jones.noamle@gmail.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-templatematch
*
* Performs template matching on videos and images, providing detected positions via bus messages.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch-0.10 videotestsrc ! decodebin ! videoconvert ! templatematch template=/path/to/file.jpg ! videoconvert ! xvimagesink
* ]|
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <gst/gst.h>
#include "../../gst-libs/gst/gst-i18n-plugin.h"
#include "gstopencvutils.h"
#include "gsttemplatematch.h"
GST_DEBUG_CATEGORY_STATIC (gst_template_match_debug);
#define GST_CAT_DEFAULT gst_template_match_debug
#define DEFAULT_METHOD (3)
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_METHOD,
PROP_TEMPLATE,
PROP_DISPLAY,
};
/* 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 ("BGR"))
);
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("BGR"))
);
G_DEFINE_TYPE (GstTemplateMatch, gst_template_match, GST_TYPE_ELEMENT);
static void gst_template_match_finalize (GObject * object);
static void gst_template_match_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_template_match_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_template_match_handle_sink_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static GstFlowReturn gst_template_match_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf);
static void gst_template_match_load_template (GstTemplateMatch * filter,
gchar * template);
static void gst_template_match_match (IplImage * input, IplImage * template,
IplImage * dist_image, double *best_res, CvPoint * best_pos, int method);
/* initialize the templatematch's class */
static void
gst_template_match_class_init (GstTemplateMatchClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gobject_class = (GObjectClass *) klass;
gobject_class->finalize = gst_template_match_finalize;
gobject_class->set_property = gst_template_match_set_property;
gobject_class->get_property = gst_template_match_get_property;
g_object_class_install_property (gobject_class, PROP_METHOD,
g_param_spec_int ("method", "Method",
"Specifies the way the template must be compared with image regions. 0=SQDIFF, 1=SQDIFF_NORMED, 2=CCOR, 3=CCOR_NORMED, 4=CCOEFF, 5=CCOEFF_NORMED.",
0, 5, DEFAULT_METHOD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_TEMPLATE,
g_param_spec_string ("template", "Template", "Filename of template image",
NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_DISPLAY,
g_param_spec_boolean ("display", "Display",
"Sets whether the detected template should be highlighted in the output",
TRUE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_static_metadata (element_class,
"templatematch",
"Filter/Effect/Video",
"Performs template matching on videos and images, providing detected positions via bus messages.",
"Noam Lewis <jones.noamle@gmail.com>");
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));
}
/* initialize the new element
* instantiate pads and add them to element
* set pad callback functions
* initialize instance structure
*/
static void
gst_template_match_init (GstTemplateMatch * filter)
{
filter->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
gst_pad_set_event_function (filter->sinkpad,
GST_DEBUG_FUNCPTR (gst_template_match_handle_sink_event));
gst_pad_set_chain_function (filter->sinkpad,
GST_DEBUG_FUNCPTR (gst_template_match_chain));
GST_PAD_SET_PROXY_CAPS (filter->sinkpad);
filter->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
GST_PAD_SET_PROXY_CAPS (filter->srcpad);
gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
filter->template = NULL;
filter->display = TRUE;
filter->cvTemplateImage = NULL;
filter->cvDistImage = NULL;
filter->cvImage = NULL;
filter->method = DEFAULT_METHOD;
}
static void
gst_template_match_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstTemplateMatch *filter = GST_TEMPLATE_MATCH (object);
switch (prop_id) {
case PROP_METHOD:
GST_OBJECT_LOCK (filter);
switch (g_value_get_int (value)) {
case 0:
filter->method = CV_TM_SQDIFF;
break;
case 1:
filter->method = CV_TM_SQDIFF_NORMED;
break;
case 2:
filter->method = CV_TM_CCORR;
break;
case 3:
filter->method = CV_TM_CCORR_NORMED;
break;
case 4:
filter->method = CV_TM_CCOEFF;
break;
case 5:
filter->method = CV_TM_CCOEFF_NORMED;
break;
}
GST_OBJECT_UNLOCK (filter);
break;
case PROP_TEMPLATE:
gst_template_match_load_template (filter, g_value_dup_string (value));
break;
case PROP_DISPLAY:
GST_OBJECT_LOCK (filter);
filter->display = g_value_get_boolean (value);
GST_OBJECT_UNLOCK (filter);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_template_match_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstTemplateMatch *filter = GST_TEMPLATE_MATCH (object);
switch (prop_id) {
case PROP_METHOD:
g_value_set_int (value, filter->method);
break;
case PROP_TEMPLATE:
g_value_set_string (value, filter->template);
break;
case PROP_DISPLAY:
g_value_set_boolean (value, filter->display);
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_template_match_handle_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstTemplateMatch *filter;
GstVideoInfo info;
gboolean res = TRUE;
filter = GST_TEMPLATE_MATCH (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
gst_video_info_from_caps (&info, caps);
if (filter->cvImage) {
cvReleaseImageHeader (&filter->cvImage);
}
filter->cvImage =
cvCreateImageHeader (cvSize (info.width, info.height), IPL_DEPTH_8U,
3);
break;
}
default:
break;
}
res = gst_pad_event_default (pad, parent, event);
return res;
}
static void
gst_template_match_finalize (GObject * object)
{
GstTemplateMatch *filter;
filter = GST_TEMPLATE_MATCH (object);
g_free (filter->template);
if (filter->cvImage) {
cvReleaseImageHeader (&filter->cvImage);
}
if (filter->cvDistImage) {
cvReleaseImage (&filter->cvDistImage);
}
if (filter->cvTemplateImage) {
cvReleaseImage (&filter->cvTemplateImage);
}
G_OBJECT_CLASS (gst_template_match_parent_class)->finalize (object);
}
/* chain function
* this function does the actual processing
*/
static GstFlowReturn
gst_template_match_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstTemplateMatch *filter;
CvPoint best_pos;
double best_res;
GstMapInfo info;
GstMessage *m = NULL;
filter = GST_TEMPLATE_MATCH (parent);
if ((!filter) || (!buf)) {
return GST_FLOW_OK;
}
GST_LOG_OBJECT (filter, "Buffer size %u", (guint) gst_buffer_get_size (buf));
buf = gst_buffer_make_writable (buf);
gst_buffer_map (buf, &info, GST_MAP_READWRITE);
filter->cvImage->imageData = (char *) info.data;
GST_OBJECT_LOCK (filter);
if (filter->cvTemplateImage && !filter->cvDistImage) {
if (filter->cvTemplateImage->width > filter->cvImage->width) {
GST_WARNING ("Template Image is wider than input image");
} else if (filter->cvTemplateImage->height > filter->cvImage->height) {
GST_WARNING ("Template Image is taller than input image");
} else {
GST_DEBUG_OBJECT (filter, "cvCreateImage (Size(%d-%d+1,%d) %d, %d)",
filter->cvImage->width, filter->cvTemplateImage->width,
filter->cvImage->height - filter->cvTemplateImage->height + 1,
IPL_DEPTH_32F, 1);
filter->cvDistImage =
cvCreateImage (cvSize (filter->cvImage->width -
filter->cvTemplateImage->width + 1,
filter->cvImage->height - filter->cvTemplateImage->height + 1),
IPL_DEPTH_32F, 1);
if (!filter->cvDistImage) {
GST_WARNING ("Couldn't create dist image.");
}
}
}
if (filter->cvTemplateImage && filter->cvDistImage) {
GstStructure *s;
gst_template_match_match (filter->cvImage, filter->cvTemplateImage,
filter->cvDistImage, &best_res, &best_pos, filter->method);
s = gst_structure_new ("template_match",
"x", G_TYPE_UINT, best_pos.x,
"y", G_TYPE_UINT, best_pos.y,
"width", G_TYPE_UINT, filter->cvTemplateImage->width,
"height", G_TYPE_UINT, filter->cvTemplateImage->height,
"result", G_TYPE_DOUBLE, best_res, NULL);
m = gst_message_new_element (GST_OBJECT (filter), s);
if (filter->display) {
CvPoint corner = best_pos;
CvScalar color;
if (filter->method == CV_TM_SQDIFF_NORMED
|| filter->method == CV_TM_CCORR_NORMED
|| filter->method == CV_TM_CCOEFF_NORMED) {
/* Yellow growing redder as match certainty approaches 1.0. This can
only be applied with method == *_NORMED as the other match methods
aren't normalized to be in range 0.0 - 1.0 */
color = CV_RGB (255, 255 - pow (255, best_res), 32);
} else {
color = CV_RGB (255, 32, 32);
}
buf = gst_buffer_make_writable (buf);
corner.x += filter->cvTemplateImage->width;
corner.y += filter->cvTemplateImage->height;
cvRectangle (filter->cvImage, best_pos, corner, color, 3, 8, 0);
}
}
GST_OBJECT_UNLOCK (filter);
if (m) {
gst_element_post_message (GST_ELEMENT (filter), m);
}
return gst_pad_push (filter->srcpad, buf);
}
static void
gst_template_match_match (IplImage * input, IplImage * template,
IplImage * dist_image, double *best_res, CvPoint * best_pos, int method)
{
double dist_min = 0, dist_max = 0;
CvPoint min_pos, max_pos;
cvMatchTemplate (input, template, dist_image, method);
cvMinMaxLoc (dist_image, &dist_min, &dist_max, &min_pos, &max_pos, NULL);
if ((CV_TM_SQDIFF_NORMED == method) || (CV_TM_SQDIFF == method)) {
*best_res = dist_min;
*best_pos = min_pos;
if (CV_TM_SQDIFF_NORMED == method) {
*best_res = 1 - *best_res;
}
} else {
*best_res = dist_max;
*best_pos = max_pos;
}
}
/* We take ownership of template here */
static void
gst_template_match_load_template (GstTemplateMatch * filter, gchar * template)
{
gchar *oldTemplateFilename = NULL;
IplImage *oldTemplateImage = NULL, *newTemplateImage = NULL, *oldDistImage =
NULL;
if (template) {
newTemplateImage = cvLoadImage (template, CV_LOAD_IMAGE_COLOR);
if (!newTemplateImage) {
/* Unfortunately OpenCV doesn't seem to provide any way of finding out
why the image load failed, so we can't be more specific than FAILED: */
GST_ELEMENT_WARNING (filter, RESOURCE, FAILED,
(_("OpenCV failed to load template image")),
("While attempting to load template '%s'", template));
g_free (template);
template = NULL;
}
}
GST_OBJECT_LOCK (filter);
oldTemplateFilename = filter->template;
filter->template = template;
oldTemplateImage = filter->cvTemplateImage;
filter->cvTemplateImage = newTemplateImage;
oldDistImage = filter->cvDistImage;
/* This will be recreated in the chain function as required: */
filter->cvDistImage = NULL;
GST_OBJECT_UNLOCK (filter);
cvReleaseImage (&oldDistImage);
cvReleaseImage (&oldTemplateImage);
g_free (oldTemplateFilename);
}
/* entry point to initialize the plug-in
* initialize the plug-in itself
* register the element factories and other features
*/
gboolean
gst_template_match_plugin_init (GstPlugin * templatematch)
{
/* debug category for fltering log messages */
GST_DEBUG_CATEGORY_INIT (gst_template_match_debug, "templatematch",
0,
"Performs template matching on videos and images, providing detected positions via bus messages");
return gst_element_register (templatematch, "templatematch", GST_RANK_NONE,
GST_TYPE_TEMPLATE_MATCH);
}