Measure line length in pixels atomatically

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Aaron Schüddekopf
Aaron Schüddekopf 2020-11-11
回答： Tarunbir Gambhir 2021-3-24
Hello,
as i wrote in the title, i would like to know, if it's possible to measure the length of a line. unfortunately it is as you can see in the attachements one long line. but i need the edge length. so i tried to detect the corners with regionprops and detectHarrisFeatures but nothing has worked yet. a scale to calculate the real length in cm is given. just to make it clear: i just need to know how i could possibly detect those corners. if i know the pixels in the corners it is, as far as i can think of, easy to calculate the pixels between.
Thank you.
Cheers... Aaron

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回答（1 个）

Tarunbir Gambhir
Tarunbir Gambhir 2021-3-24
Based on your question, I suggest you use the function imdistline to get the distance between two points on an image in pixels. It consists of an interactive line over an image, paired with a text label that displays the distance between the line endpoints.
Another function that could be helpful is drawpoint. This function would allow you to get the pixel coordinates of a point of your choice on the image.

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