private static void LineSegmentDetectorSample()
{
var img = new Mat("data/shapes.png", ImreadModes.GrayScale);
var lines = new Mat();
var view = img.Clone();
var detector = LineSegmentDetector.Create();
detector.Detect(img, lines);
detector.DrawSegments(view, lines);
Window.ShowImages(view);
}
private void button2_Click(object sender, EventArgs e)
{
if (File.Exists(textBox1.Text))
{
Bitmap bmp = new Bitmap(textBox1.Text);
//Bitmap bmpT = (Bitmap)bmp.GetThumbnailImage(500, (int)((float)bmp.Height / ((float)bmp.Width / 500)), null, IntPtr.Zero); //use this image if tou want to autorotate by text lines
using (LineSegmentDetector lsd = new LineSegmentDetector(MakeGrayscaleBitmap(bmp)))
{
lsd.FindLines(0.6);
//lsd.FindLines(0.5); //specified scale for image
using (Graphics gr = Graphics.FromImage(bmp))
{
gr.SmoothingMode = SmoothingMode.AntiAlias;
gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
gr.PixelOffsetMode = PixelOffsetMode.HighQuality;
if (lsd.Lines.Length > 0)
{
foreach (LSDLine ll in lsd.Lines)
{
LSDLine l = new LSDLine(ll.P1, ll.P2);
using (Pen thick_pen = new Pen(Color.Red, 2))
{
gr.DrawLine(thick_pen, ll.P1, ll.P2);
}
}
}
}
LSDLine hl = new LSDLine(new Point(0, 0), new Point(1, 0));
var lgroup = lsd.Lines.GroupBy(x => (int)x.GetExteriorAngleDegree(hl), new simAngleLines());
var lgroupG = lgroup.GroupBy(m => m.Key);
var ang = (from i in lgroupG orderby i.Sum(x => x.Count()) descending select i.Key).ElementAtOrDefault(0);//avg angle of lines
foreach (var u in lgroup)
{
Debug.WriteLine(u.Count() + " : " + u.Key);
}
this.Text = "Lines count = " + lsd.Lines.Length.ToString() + ", avg angle=" + ang.ToString();
pictureBox1.Image = bmp; //=RotateImage(bmp,ang); //use this to rotate image by avg lines angle
}
}
}
