/* * GStreamer * Copyright (C) 2013 Miguel Casas-Sanchez * * 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 * * * Example launch line * |[ * gst-launch-1.0 videotestsrc ! decodebin ! videoconvert ! skindetect ! videoconvert ! xvimagesink * ]| * */ #ifdef HAVE_CONFIG_H #include #endif #include "gstskindetect.h" #include #if (CV_MAJOR_VERSION >= 4) #include #endif 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, (GParamFlags) (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 "); gst_element_class_add_static_pad_template (element_class, &src_factory); gst_element_class_add_static_pad_template (element_class, &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_opencv_video_filter_set_in_place (GST_OPENCV_VIDEO_FILTER_CAST (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); cvSplit (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) { cvSplit (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); }