MATLAB: How to find the islands of a binary matrix

boundryislandmatrix

If you have a 2D binary matrix, how would you find the islands of ones?

Thanks

Best Answer

regionprops() and request whichever identification mode you prefer, such as BoundingBox or 'PixelIdxList' or 'PixelList' or 'SubarrayIdx'

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MATLAB: Centroid of thin-edged (One Pixel thickness) connected blobs

regionprops(bwconncomp((imfill(A,'holes')-A),4),'centroid')

1) Fill the holes/"blobs" in the image.

2) Subtract the boundaries from the filled image to obtain 2 disconnected blobs (4 way connectivity due to pixelization).

3) Find individual blobs.

4) Find their centroid.

MATLAB: How to remove islands in a non-binary greyscale image

the trick is to use the bwareaopen() which actually removes the islands then use the binary image to cut out the original islands using OrigionalImageName(~BinaryImageName) = 0;. This uses the island free binary image to cut the islands out of the greyscale original image.

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MATLAB: Centroid of thin-edged (One Pixel thickness) connected blobs

MATLAB: How to remove islands in a non-binary greyscale image

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