1 /*
2 * GStreamer
3 * Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Alternatively, the contents of this file may be used under the
24 * GNU Lesser General Public License Version 2.1 (the "LGPL"), in
25 * which case the following provisions apply instead of the ones
26 * mentioned above:
27 *
28 * This library is free software; you can redistribute it and/or
29 * modify it under the terms of the GNU Library General Public
30 * License as published by the Free Software Foundation; either
31 * version 2 of the License, or (at your option) any later version.
32 *
33 * This library is distributed in the hope that it will be useful,
34 * but WITHOUT ANY WARRANTY; without even the implied warranty of
35 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
36 * Library General Public License for more details.
37 *
38 * You should have received a copy of the GNU Library General Public
39 * License along with this library; if not, write to the
40 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
41 * Boston, MA 02110-1301, USA.
42 */
43
44 /**
45 * SECTION:element-cvequalizehist
46 *
47 * Equalizes the histogram of a grayscale image with the cvEqualizeHist OpenCV
48 * function.
49 *
50 * ## Example launch line
51 *
52 * |[
53 * gst-launch-1.0 videotestsrc pattern=23 ! cvequalizehist ! videoconvert ! autovideosink
54 * ]|
55 */
56
57
58 #ifdef HAVE_CONFIG_H
59 # include <config.h>
60 #endif
61
62 #include "gstcvequalizehist.h"
63 #include <opencv2/imgproc.hpp>
64
65 GST_DEBUG_CATEGORY_STATIC (gst_cv_equalize_hist_debug);
66 #define GST_CAT_DEFAULT gst_cv_equalize_hist_debug
67
68 static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
69 GST_PAD_SINK,
70 GST_PAD_ALWAYS,
71 GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("GRAY8")));
72
73 static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
74 GST_PAD_SRC,
75 GST_PAD_ALWAYS,
76 GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("GRAY8")));
77
78 G_DEFINE_TYPE_WITH_CODE (GstCvEqualizeHist, gst_cv_equalize_hist,
79 GST_TYPE_OPENCV_VIDEO_FILTER,
80 GST_DEBUG_CATEGORY_INIT (gst_cv_equalize_hist_debug, "cvequalizehist", 0,
81 "cvequalizehist");
82 );
83 GST_ELEMENT_REGISTER_DEFINE (cvequalizehist, "cvequalizehist", GST_RANK_NONE,
84 GST_TYPE_CV_EQUALIZE_HIST);
85
86 static GstFlowReturn gst_cv_equalize_hist_transform (GstOpencvVideoFilter *
87 filter, GstBuffer * buf, cv::Mat img, GstBuffer * outbuf, cv::Mat outimg);
88
89
90 static void
gst_cv_equalize_hist_class_init(GstCvEqualizeHistClass * klass)91 gst_cv_equalize_hist_class_init (GstCvEqualizeHistClass * klass)
92 {
93 GstOpencvVideoFilterClass *gstopencvbasefilter_class;
94 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
95 gstopencvbasefilter_class = (GstOpencvVideoFilterClass *) klass;
96
97 gstopencvbasefilter_class->cv_trans_func = gst_cv_equalize_hist_transform;
98
99 gst_element_class_add_static_pad_template (element_class, &src_factory);
100 gst_element_class_add_static_pad_template (element_class, &sink_factory);
101
102 gst_element_class_set_static_metadata (element_class,
103 "cvequalizehist",
104 "Transform/Effect/Video",
105 "Applies cvEqualizeHist OpenCV function to the image",
106 "Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
107 }
108
109 static void
gst_cv_equalize_hist_init(GstCvEqualizeHist * filter)110 gst_cv_equalize_hist_init (GstCvEqualizeHist * filter)
111 {
112 gst_opencv_video_filter_set_in_place (GST_OPENCV_VIDEO_FILTER_CAST (filter),
113 FALSE);
114 }
115
116 static GstFlowReturn
gst_cv_equalize_hist_transform(GstOpencvVideoFilter * base,GstBuffer * buf,cv::Mat img,GstBuffer * outbuf,cv::Mat outimg)117 gst_cv_equalize_hist_transform (GstOpencvVideoFilter * base,
118 GstBuffer * buf, cv::Mat img, GstBuffer * outbuf, cv::Mat outimg)
119 {
120 cv::equalizeHist (img, outimg);
121 return GST_FLOW_OK;
122 }
123