MATLAB: How to recognize the boundary of an object

boundary of objectimage processingImage Processing Toolbox

Please let me know How to recognize the boundary of an object and determine the object area from that of an image in matlab. Thanks.

Best Answer

Assuming you have already segmented your object into foreground and background (you have a binary image), then try bwboundaries() to get a list of (x,y) coordinates, or bwperim() to get an image of the perimeter.

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MATLAB: Image segmentation and blobs

The best one is the one that works for your images. Obviously there is no one single algorithm that works best for all natural images. Well, maybe not so obvious, because you asked. Eventually all images come down to blobs. You do whatever you have to do to get down to a gray level image that you can threshold into foreground and background blobs.

MATLAB: To assign different color in boundary.

You can use bwboundaries() and plot() to do that:

hold on;
boundaries = bwboundaries(binaryImage);
numberOfBoundaries = size(boundaries, 1);
for k = 1 : numberOfBoundaries
  thisBoundary = boundaries{k};
  plot(thisBoundary(:,2), thisBoundary(:,1), 'g', 'LineWidth', 2);
end
hold off;

Best Answer

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MATLAB: Image segmentation and blobs

MATLAB: To assign different color in boundary.

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