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gstreamer/ext/opencv/gstskindetect.c

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/*
* GStreamer
* Copyright (C) 2013 Miguel Casas-Sanchez <miguelecasassanchez@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-skindetect
*
* Human skin detection on videos and images
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch-1.0 videotestsrc ! decodebin ! videoconvert ! skindetect ! videoconvert ! xvimagesink
* ]|
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gst/gst.h>
#include "gstopencvutils.h"
#include "gstskindetect.h"
GST_DEBUG_CATEGORY_STATIC (gst_skin_detect_debug);
#define GST_CAT_DEFAULT gst_skin_detect_debug
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_POSTPROCESS,
PROP_METHOD,
PROP_MASK
};
typedef enum
{
HSV,
RGB
} GstSkindetectMethod;
#define GST_TYPE_SKIN_DETECT_METHOD (gst_skin_detect_method_get_type ())
static GType
gst_skin_detect_method_get_type (void)
{
static GType etype = 0;
if (etype == 0) {
static const GEnumValue values[] = {
{HSV, "Classic HSV thresholding", "hsv"},
{RGB, "Normalised-RGB colorspace thresholding", "rgb"},
{0, NULL, NULL},
};
etype = g_enum_register_static ("GstSkindetectMethod", values);
}
return etype;
}
G_DEFINE_TYPE (GstSkinDetect, gst_skin_detect, GST_TYPE_OPENCV_VIDEO_FILTER);
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_skin_detect_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_skin_detect_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstFlowReturn gst_skin_detect_transform (GstOpencvVideoFilter * filter,
GstBuffer * buf, IplImage * img, GstBuffer * outbuf, IplImage * outimg);
static gboolean gst_skin_detect_stop (GstBaseTransform * basesrc);
static gboolean
gst_skin_detect_set_caps (GstOpencvVideoFilter * transform,
gint in_width, gint in_height, gint in_depth, gint in_channels,
gint out_width, gint out_height, gint out_depth, gint out_channels);
static void gst_skin_detect_release_all_images (GstSkinDetect * filter);
/* initialize the skindetect's class */
static void
gst_skin_detect_class_init (GstSkinDetectClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstBaseTransformClass *basesrc_class = GST_BASE_TRANSFORM_CLASS (klass);
GstOpencvVideoFilterClass *gstopencvbasefilter_class;
gobject_class = (GObjectClass *) klass;
gstopencvbasefilter_class = (GstOpencvVideoFilterClass *) klass;
gobject_class->set_property = gst_skin_detect_set_property;
gobject_class->get_property = gst_skin_detect_get_property;
gstopencvbasefilter_class->cv_trans_func = gst_skin_detect_transform;
g_object_class_install_property (gobject_class, PROP_POSTPROCESS,
g_param_spec_boolean ("postprocess", "Postprocess",
"Apply opening-closing to skin detection to extract large, significant blobs ",
TRUE, (GParamFlags)
(G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
g_object_class_install_property (gobject_class, PROP_METHOD,
g_param_spec_enum ("method",
"Method to use",
"Method to use",
GST_TYPE_SKIN_DETECT_METHOD, HSV,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_static_metadata (element_class,
"skindetect",
"Filter/Effect/Video",
"Performs non-parametric skin detection on input",
"Miguel Casas-Sanchez <miguelecasassanchez@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));
basesrc_class->stop = gst_skin_detect_stop;
gstopencvbasefilter_class->cv_set_caps = gst_skin_detect_set_caps;
}
/* initialize the new element
* instantiate pads and add them to element
* set pad calback functions
* initialize instance structure
*/
static void
gst_skin_detect_init (GstSkinDetect * filter)
{
filter->postprocess = TRUE;
filter->method = HSV;
gst_base_transform_set_in_place (GST_BASE_TRANSFORM (filter), FALSE);
}
static void
gst_skin_detect_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstSkinDetect *filter = GST_SKIN_DETECT (object);
switch (prop_id) {
case PROP_POSTPROCESS:
filter->postprocess = g_value_get_boolean (value);
break;
case PROP_METHOD:
filter->method = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_skin_detect_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstSkinDetect *filter = GST_SKIN_DETECT (object);
switch (prop_id) {
case PROP_POSTPROCESS:
g_value_set_boolean (value, filter->postprocess);
break;
case PROP_METHOD:
g_value_set_enum (value, filter->method);
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_skin_detect_set_caps (GstOpencvVideoFilter * transform,
gint in_width, gint in_height, gint in_depth, gint in_channels,
gint out_width, gint out_height, gint out_depth, gint out_channels)
{
GstSkinDetect *filter = GST_SKIN_DETECT (transform);
CvSize size = cvSize (in_width, in_height);
// If cvRGB is already allocated, it means there's a cap modification,
// so release first all the images.
if (NULL != filter->cvRGB)
gst_skin_detect_release_all_images (filter);
filter->cvRGB = cvCreateImageHeader (size, IPL_DEPTH_8U, 3);
filter->cvSkin = cvCreateImageHeader (size, IPL_DEPTH_8U, 3);
filter->cvChA = cvCreateImage (size, IPL_DEPTH_8U, 1);
filter->width = in_width;
filter->height = in_height;
filter->cvHSV = cvCreateImage (size, IPL_DEPTH_8U, 3);
filter->cvH = cvCreateImage (size, 8, 1); /* Hue component. */
filter->cvH2 = cvCreateImage (size, 8, 1); /* Hue component, 2nd threshold */
filter->cvS = cvCreateImage (size, 8, 1); /* Saturation component. */
filter->cvV = cvCreateImage (size, 8, 1); /* Brightness component. */
filter->cvSkinPixels1 = cvCreateImage (size, 8, 1); /* Greyscale output image */
filter->cvR = cvCreateImage (size, 8, 1); /* R component. */
filter->cvG = cvCreateImage (size, 8, 1); /* G component. */
filter->cvB = cvCreateImage (size, 8, 1); /* B component. */
filter->cvAll = cvCreateImage (size, IPL_DEPTH_32F, 1); /* (R+G+B) component. */
filter->cvR2 = cvCreateImage (size, IPL_DEPTH_32F, 1); /* R component, 32bits */
filter->cvRp = cvCreateImage (size, IPL_DEPTH_32F, 1); /* R' and >0.4 */
filter->cvGp = cvCreateImage (size, IPL_DEPTH_32F, 1); /* G' and > 0.28 */
filter->cvRp2 = cvCreateImage (size, IPL_DEPTH_32F, 1); /* R' <0.6 */
filter->cvGp2 = cvCreateImage (size, IPL_DEPTH_32F, 1); /* G' <0.4 */
filter->cvSkinPixels2 = cvCreateImage (size, IPL_DEPTH_32F, 1); /* Greyscale output image. */
filter->cvdraft = cvCreateImage (size, IPL_DEPTH_8U, 1); /* Greyscale output image. */
return TRUE;
}
/* Clean up */
static gboolean
gst_skin_detect_stop (GstBaseTransform * basesrc)
{
GstSkinDetect *filter = GST_SKIN_DETECT (basesrc);
if (filter->cvRGB != NULL)
gst_skin_detect_release_all_images (filter);
return TRUE;
}
static void
gst_skin_detect_release_all_images (GstSkinDetect * filter)
{
cvReleaseImage (&filter->cvRGB);
cvReleaseImage (&filter->cvSkin);
cvReleaseImage (&filter->cvChA);
cvReleaseImage (&filter->cvHSV);
cvReleaseImage (&filter->cvH);
cvReleaseImage (&filter->cvH2);
cvReleaseImage (&filter->cvS);
cvReleaseImage (&filter->cvV);
cvReleaseImage (&filter->cvSkinPixels1);
cvReleaseImage (&filter->cvR);
cvReleaseImage (&filter->cvG);
cvReleaseImage (&filter->cvB);
cvReleaseImage (&filter->cvAll);
cvReleaseImage (&filter->cvR2);
cvReleaseImage (&filter->cvRp);
cvReleaseImage (&filter->cvGp);
cvReleaseImage (&filter->cvRp2);
cvReleaseImage (&filter->cvGp2);
cvReleaseImage (&filter->cvSkinPixels2);
cvReleaseImage (&filter->cvdraft);
}
static GstFlowReturn
gst_skin_detect_transform (GstOpencvVideoFilter * base, GstBuffer * buf,
IplImage * img, GstBuffer * outbuf, IplImage * outimg)
{
GstSkinDetect *filter = GST_SKIN_DETECT (base);
filter->cvRGB->imageData = (char *) img->imageData;
filter->cvSkin->imageData = (char *) outimg->imageData;
/* SKIN COLOUR BLOB DETECTION */
if (HSV == filter->method) {
cvCvtColor (filter->cvRGB, filter->cvHSV, CV_RGB2HSV);
cvCvtPixToPlane (filter->cvHSV, filter->cvH, filter->cvS, filter->cvV, 0); /* Extract the 3 color components. */
/* Detect which pixels in each of the H, S and V channels are probably skin pixels.
Assume that skin has a Hue between 0 to 18 (out of 180), and Saturation above 50, and Brightness above 80. */
cvThreshold (filter->cvH, filter->cvH2, 10, UCHAR_MAX, CV_THRESH_BINARY); /* (hue > 10) */
cvThreshold (filter->cvH, filter->cvH, 20, UCHAR_MAX, CV_THRESH_BINARY_INV); /* (hue < 20) */
cvThreshold (filter->cvS, filter->cvS, 48, UCHAR_MAX, CV_THRESH_BINARY); /* (sat > 48) */
cvThreshold (filter->cvV, filter->cvV, 80, UCHAR_MAX, CV_THRESH_BINARY); /* (val > 80) */
/* erode the HUE to get rid of noise. */
cvErode (filter->cvH, filter->cvH, NULL, 1);
/* Combine all 3 thresholded color components, so that an output pixel will only
be white (255) if the H, S and V pixels were also white.
imageSkin = (hue > 10) ^ (hue < 20) ^ (sat > 48) ^ (val > 80), where ^ mean pixels-wise AND */
cvAnd (filter->cvH, filter->cvS, filter->cvSkinPixels1, NULL);
cvAnd (filter->cvSkinPixels1, filter->cvH2, filter->cvSkinPixels1, NULL);
cvAnd (filter->cvSkinPixels1, filter->cvV, filter->cvSkinPixels1, NULL);
cvCvtColor (filter->cvSkinPixels1, filter->cvRGB, CV_GRAY2RGB);
} else if (RGB == filter->method) {
cvCvtPixToPlane (filter->cvRGB, filter->cvR, filter->cvG, filter->cvB, 0); /* Extract the 3 color components. */
cvAdd (filter->cvR, filter->cvG, filter->cvAll, NULL);
cvAdd (filter->cvB, filter->cvAll, filter->cvAll, NULL); /* All = R + G + B */
cvDiv (filter->cvR, filter->cvAll, filter->cvRp, 1.0); /* R' = R / ( R + G + B) */
cvDiv (filter->cvG, filter->cvAll, filter->cvGp, 1.0); /* G' = G / ( R + G + B) */
cvConvertScale (filter->cvR, filter->cvR2, 1.0, 0.0);
cvCopy (filter->cvGp, filter->cvGp2, NULL);
cvCopy (filter->cvRp, filter->cvRp2, NULL);
cvThreshold (filter->cvR2, filter->cvR2, 60, UCHAR_MAX, CV_THRESH_BINARY); /* (R > 60) */
cvThreshold (filter->cvRp, filter->cvRp, 0.42, UCHAR_MAX, CV_THRESH_BINARY); /* (R'> 0.4) */
cvThreshold (filter->cvRp2, filter->cvRp2, 0.6, UCHAR_MAX, CV_THRESH_BINARY_INV); /* (R'< 0.6) */
cvThreshold (filter->cvGp, filter->cvGp, 0.28, UCHAR_MAX, CV_THRESH_BINARY); /* (G'> 0.28) */
cvThreshold (filter->cvGp2, filter->cvGp2, 0.4, UCHAR_MAX, CV_THRESH_BINARY_INV); /* (G'< 0.4) */
/* Combine all 3 thresholded color components, so that an output pixel will only
be white (255) if the H, S and V pixels were also white. */
cvAnd (filter->cvR2, filter->cvRp, filter->cvSkinPixels2, NULL);
cvAnd (filter->cvRp, filter->cvSkinPixels2, filter->cvSkinPixels2, NULL);
cvAnd (filter->cvRp2, filter->cvSkinPixels2, filter->cvSkinPixels2, NULL);
cvAnd (filter->cvGp, filter->cvSkinPixels2, filter->cvSkinPixels2, NULL);
cvAnd (filter->cvGp2, filter->cvSkinPixels2, filter->cvSkinPixels2, NULL);
cvConvertScale (filter->cvSkinPixels2, filter->cvdraft, 1.0, 0.0);
cvCvtColor (filter->cvdraft, filter->cvRGB, CV_GRAY2RGB);
}
/* After this we have a RGB Black and white image with the skin, in
filter->cvRGB. We can postprocess by applying 1 erode-dilate and 1
dilate-erode, or alternatively 1 opening-closing all together, with
the goal of removing small (spurious) skin spots and creating large
connected areas */
if (filter->postprocess) {
cvSplit (filter->cvRGB, filter->cvChA, NULL, NULL, NULL);
cvErode (filter->cvChA, filter->cvChA,
cvCreateStructuringElementEx (3, 3, 1, 1, CV_SHAPE_RECT, NULL), 1);
cvDilate (filter->cvChA, filter->cvChA,
cvCreateStructuringElementEx (3, 3, 1, 1, CV_SHAPE_RECT, NULL), 2);
cvErode (filter->cvChA, filter->cvChA,
cvCreateStructuringElementEx (3, 3, 1, 1, CV_SHAPE_RECT, NULL), 1);
cvCvtColor (filter->cvChA, filter->cvRGB, CV_GRAY2RGB);
}
cvCopy (filter->cvRGB, filter->cvSkin, NULL);
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_skin_detect_plugin_init (GstPlugin * plugin)
{
/* debug category for fltering log messages
*
*/
GST_DEBUG_CATEGORY_INIT (gst_skin_detect_debug, "skindetect",
0, "Performs skin detection on videos and images");
return gst_element_register (plugin, "skindetect", GST_RANK_NONE,
GST_TYPE_SKIN_DETECT);
}
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