How can I mount line on image so that computer can track it?

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hyong suk choo
hyong suk choo 2017-1-25
评论： hyong suk choo 2017-1-31
angle measurment
https://mathworks.com/help/images/examples/measuring-angle-of-intersection.html
I tracked this tutorial and faced problem.
In my case, image I want to analyze has unstable horizontal boundary.
That makes computer hard to track horizontal boundary and data gone inexact.
So I drew line on image and let the computer track boundary but computer couldnt.
How can I make straight line that computer can track?
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Walter Roberson
Walter Roberson 2017-1-31
Using line() draws on the screen; it does not change what is stored in the variable img .
If you have the Computer Vision toolbox you can use https://www.mathworks.com/help/vision/ref/vision.shapeinserter-class.html

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Tohru Kikawada
Tohru Kikawada 2017-1-27
Try to detect lines with houghlines as follows:
https://mathworks.com/help/images/hough-transform.html
It could be applied for imbalanced boundary images.

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