From b90d1b6bf846a97b260e01f0799f39ffb439ea6d Mon Sep 17 00:00:00 2001
From: Benjamin Franzke <benjaminfranzke@googlemail.com>
Date: Fri, 25 May 2012 11:08:24 +0200
Subject: cvg: Add Sobel filter

---
 cvg.c  | 24 ++++++++++++++++++++++++
 cvg.ui |  1 +
 2 files changed, 25 insertions(+)

diff --git a/cvg.c b/cvg.c
index 42c02f4..1d43aba 100644
--- a/cvg.c
+++ b/cvg.c
@@ -259,6 +259,28 @@ gauss_filter(struct cvg *cvg, IplImage *image)
 	return out;
 }
 
+static IplImage *
+sobel_filter(struct cvg *cvg, IplImage *image)
+{
+	IplImage *out, *tmp, *tmp2, *gray;
+
+	gray = cvCreateImage(cvGetSize(image), IPL_DEPTH_8U, 1);
+	tmp = cvCreateImage(cvGetSize(image), IPL_DEPTH_16S, 1);
+	tmp2 = cvCreateImage(cvGetSize(image), IPL_DEPTH_8U, 1);
+	out = cvCreateImage(cvGetSize(image), image->depth, image->nChannels);
+
+	cvCvtColor(image, gray, CV_BGR2GRAY);
+	cvSobel(gray, tmp, 0, 1, 3);
+	cvConvertScaleAbs(tmp, tmp2, 1, 0); 
+	cvCvtColor(tmp2, out, CV_GRAY2BGR);
+
+	cvReleaseImage(&gray);
+	cvReleaseImage(&tmp);
+	cvReleaseImage(&tmp2);
+
+	return out;
+}
+
 static IplImage *
 good_features_to_track(struct cvg *cvg, IplImage *image)
 {
@@ -326,6 +348,8 @@ method_set(GtkComboBox *widget, gpointer userdata)
 		cvg->filter = good_features_to_track;
 	else if (strcmp(text, "Pass-Through") == 0)
 		cvg->filter = pass_through_filter;
+	else if (strcmp(text, "Sobel") == 0)
+		cvg->filter = sobel_filter;
 	else if (strcmp(text, "Hide") == 0)
 		cvg->filter = hide_filter;
 	update_right_drawing_area(cvg);
diff --git a/cvg.ui b/cvg.ui
index 0a821cd..d4ac453 100644
--- a/cvg.ui
+++ b/cvg.ui
@@ -84,6 +84,7 @@
               <item>Hide</item>
               <item>Gauss</item>
               <item>GoodFeaturesToTrack</item>
+              <item>Sobel</item>
               <item>Pass-Through</item>
             </items>
             <signal name="changed" handler="method_set" swapped="no"/>
-- 
cgit