How do I draw a line along the major axis as found with regionprops

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I have used the regionprops to find the MajorAxisLenth of each object in my image. How do I draw a line along the major axis?

Accepted Answer

Walter Roberson
Walter Roberson on 29 Jun 2011
If you get the Centroid and Orientation and MajorAxisLength properties, then this becomes mostly a traditional y = m*x + b problem, where m is tan() of the Orientation and b is chosen so that the line passes through the Centroid.
Or even easier, MajorAxisLength * cosd(Orientation) to get the x axis coordinate difference, center that around the Centroid, likewise MajorAxisLength * sind(Orientation) to get the y coordinate difference, center that around the Centroid; then line() between the two endpoints.
  4 Comments
Image Analyst
Image Analyst on 30 Oct 2021
It's the width of the bounding box.
Now they have bwferet() so look into that.

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More Answers (1)

Doug Hull
Doug Hull on 29 Jun 2011

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