How do I find the distance between two non-parallel lines?

I'm trying to find the distance between the red lines in the image, as pairs. I have the (x,y) co-ordinates of these red lines. What is the best way to measure the distance between each pair of red lines?

[Walter Roberson]

Minimum distance? Maximum distance? Average distance? Are they given just by endpoints or by intermediate points as well?

[Image Analyst]

Or distance as a function of image column,

or distance as a function of position along the slanted centerline?

Answer 1

[KSSV]

Using Distance formula...

[The Imagician]

Can you be a little more elaborate?

[KSSV]

Let data1 and data2 be two set of points, of size Nx2.

data = data1-data2 ;
dist = sqrt(data(:,1).^2+data(:,2).^2);

Answer 2

[Walter Roberson]

https://www.mathworks.com/matlabcentral/newsreader/view_thread/164048

Provided that the lines do not cross, and using Roger's formula:

For each of the two endpoints in the first line, find the distance to the segment generated by the second pair of endpoints. Switch around and find the distance from each of the endpoints of the second segment to the segment generated by the first pair of endpoints. Take the minimum of these four distances.

Answer 3

[Zhenyu Zhang]

Would you please tell me how to pair lines in image?

[Image Analyst]

Exactly what does that mean? What does "to pair" mean to you?