How to get the distance from an image ?

Hi all, I have a question about the distance acquire from a image, and the image as folloing:

in the fiste step, I'll conver the image to grey and extrcat its edge.

The question is :

1. How to get the center point (w)?
2. How to get the distacne from W to other point ?

[KSSV]

You can obtain them by gui using getpts/ ginpiut and imdistance.

[Chuanjung Lin]

Actually, I'v many images, so, I would like to use code to automatic run it. Thank you.

[Rik]

Then you will have to write code to determine the coordinates.

Answer 1

[Vinai Datta Thatiparthi]

Hi Lin,

"How to get the center point?"

• From the question, it isn't very clear how you define the the image. Have a look at the regionprops function to get the centroid of the image. You could otherwise also simply calculate from the average of the extremeties of the image coordinates.

"How to get the distance from W to other point?"

• First, you may use detectHarrisFeatures or detectMinEigenFeatures to extract the corner points in your image. Once you get the coordinates, use pdist or imdistline to get the distance between the 2 points.

As previously mentioned on the thread, you may have to programmatically call all these functions on your image set iteratively.

Hope this helps!