How to find the distance between lines in a image in matlab

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Hi All, I am trying to learn how to process images in Matlab. I am trying to find the vertical distance from the upper line to the lower one. I have a few questions as to how to start the process. Do I need to convert the image to binary in order to find the edges? How can I get the count of the pixels between these two lines?
Any guidance would be greatly appreciated to get me started in the right direction.
Thanks!
Added a JPG file.

Accepted Answer

Image Analyst
Image Analyst on 29 Apr 2015
They don't look quite perfectly straight to me, so do you want to assume they're perfectly straight, or do you want to fit a curve to them, like a quadratic or something? Also, do you need the average separation, or the separation on a column-by-column basis? And, can we assume that the garbage along the edges is something we can either zero out or crop away? And are the lines roughly horizontal in every single image, or can they be at any arbitrary angle, like 45 degrees or whatever?
  9 Comments
Jean Luo
Jean Luo on 12 Jul 2016
Hi, I actually have a very similar question as this. If you ever got the code to work, could you show it to me?

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More Answers (1)

Thomas Koelen
Thomas Koelen on 29 Apr 2015
With this function you can find the lines:
You get the coordinates from both lines and substract the top from the bottom one, that's the distance.
  1 Comment
Sriram Badri
Sriram Badri on 29 Apr 2015
Hi,
Thanks. I think the solution is only of horizontal lines. But I need a general approach to measure the distance for all type of lines say even cured ones. I don't think the lines are always horizontal.

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