Assuming you have two curved lines running parallel to each other in your image, here is a suggestion to get the mid point between curved line.
- Threshold the image
- Find contour and its bounding rectangle for each curved line's contour.
- Get angle of its bounding rectangle.
- Bounding rectangle of both curved line must be same as it is parallel to each other.
If the angle of bounding rect is 0 deg or 90 deg, subtract x coordinate of contour to get the mid point between parallel lines.
If the angle of bounding rect is other than 0 deg or 90 deg, subtract y coordinate of contour.
Share your results with image samples.
