Line joining in emgucv - line

Question

I have images of the following kind
I want that small lines which I have encircled using yellow, should be combined to form a single line., i.e. if distance between 2 lines is less than some threshold, they should be joined.
I tried using Dilate command of emgucv, but the unwanted lines also get bold.
Thanx in advance :-)

Answer 1

What your after is the Houghline function I provided a method bellow. By changing these settings you can join lines up and only display those with the strongest characteristics. However, this method may struggle since you have a very very noisy image you may want to look into a better edge detection method first before attempting to find those lines.
For every line:
private Image<Bgr, Byte> apply_Hough(Image<Bgr, Byte> Input_Image)
{
LineSegment2D[] lines = Input_Image.HoughLinesBinary(
1, //Distance resolution in pixel-related units
Math.PI / 45.0, //Angle resolution measured in radians.
50, //threshold
100, //min Line width
1 //gap between lines
)[0]; //Get the lines from the first channel
Image<Bgr, Byte> lineImage = img.Copy();
foreach (LineSegment2D line in lines)
Input_Image.Draw(line, new Bgr(Color.Red), 2);
return Input_Image;
}
Hough lines uses and very advanced voting method in which only the strongest lines will be shown and they should be listed accordingly. So also try using a for loop in replace of the foreach loop to only display the first 6 strongest lines such as this.
For the 6 strongest lines:
private Image<Bgr, Byte> apply_Hough(Image<Bgr, Byte> Input_Image)
{
LineSegment2D[] lines = Input_Image.HoughLinesBinary(
1, //Distance resolution in pixel-related units
Math.PI / 90.0, //Angle resolution measured in radians.
50, //threshold
100, //min Line width
1 //gap between lines
)[0]; //Get the lines from the first channel
Image<Bgr, Byte> lineImage = img.Copy();
for (int i = 0; i <= 6; i++)
{
Input_Image.Draw(lines[i], new Bgr(Color.Red), 2);
}
return Input_Image;
}
Hope this helps,
Cheers,
Chris