How can I get X and Y column Matrices from plotted data?

I have a circular-ish polygon of data points and would like to get these points into X and Y column matrices to do more work on like running the convex hull function.

Thanks

[the cyclist]

"circular-ish polygon of data points" doesn't adequately describe the way the data are currently stored. Can you give an example (ideally using MATLAB code, not just a description) of the data you have, and how you want the output to look?

[Michael Darrow]

Here is an image of the data. It is a plot of 480x640 logical. I cannot provide the specific code as it requires many files to understand. It is a manipulated image file though.

Answer 1

[Thorsten]

 [i j] = ind2sub(size(I), find(I == 0));

Answer 2

[Sid]

Perhaps check out bwboundaries example? (click here .)

Looks like there are a couple of different blobs, so I am not sure if you want to identify each one separately. If so, it might be useful to check out bwlabel (click here .)

HTH.