MATLAB: Removing Labeled components based on boundary condition.

image processing

Hey guys i have a binary image in which there are letters in white and background is black. No letter is attached to the boundary but some unwanted areas are attached to the boundary. Is there any way to remove these areas using the fact that those will always be attached to the boundary. Following is a link to a sample image.. http://www.image-upload.net/viewer.php?file=hiu4aujtlbl4pwbc3d3w.jpg

Best Answer

Hey one simple command solved my problem.

imclearborder(bw);

It removes the components attached to the border.

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MATLAB: Counting holes in an image

Threshold then call imclearborder() and bwlabel(). Assuming you have dark holes on a bright background:

% Binarize:
binaryImage = grayImage < someValue;
% Remove those touching border
binaryImage = imclearborder(binaryImage);
% Count holes:
[~, numHoles] = bwlabel(binaryImage);

MATLAB: Calculating the area inside boundary

Use polyarea:

area = polyarea(xCoordinates, yCoordinates);

Best Answer

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