Finding area of continuous values in a matrix

Hi there,

I have binary matrices (about 50 x 50 but this size changes) and I want to quantify the size of fields/blobs/islands in these matrices.

I really need a script that takes an X and Y co-ord (coordinates of previously identified peaks if anyone is interested) or a row and column if you prefer to think of it that way, and then counts the number of continuous/contiguous 1's around that co-ordinate.

The blobs are not always round, they may be L shaped or otherwise irregular.

If it could output the X and Y co-ordinates of every number it has counted that would also be helpful... but not crucial.

Thank you very much for any help,

Rod.

[José-Luis]

What have you tried so far?

 doc bwconncomp

Answer 1

[Image Analyst]

See my image segmentation tutorial: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 It goes over all that. Basically you need to call regionprops, and you can optionally call bwlabel or bwconncomp before calling regionprops.