MATLAB: In a binary image, can I selectively remove one of the blobs interactively

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As the title states, I have a binary image with a number of blobs. Can I interactively remove one or more of the blobs without too much trouble?

As in, I don't want program a code to remove, say, the 5th blob. I want to open up a figure, click on a blob, and delete it.

Best Answer

Label the blobs with bwlabel. Then call ginput() or impixel() and have the user click on a blob. Get the value of the labeled image at that location. Then use ismember() to erase that blob. Relabel if you want to reflect the fewer number of blobs.

Related Solutions

MATLAB: Extraction of rectangular blob from binary image

How about comparing length around the blob and length around the bounding box of the blob, like:

% sample blogs
I = imread('pillsetc.png');
Iblob = rgb2gray(I) > 200;
% measure perimeter and bounding box for each blob
stats = regionprops(Iblob,{'BoundingBox','perimeter'});
stats = struct2table(stats);
% extract the blob whose perimeter is close to round length of its bounding box
stats.Ratio = 2*sum(stats.BoundingBox(:,3:4),2)./stats.Perimeter;
idx = abs(1 - stats.Ratio) < 0.1;
stats(~idx,:) = [];
% show the result
imshow(Iblob);
hold on
for kk = 1:height(stats)
  rectangle('Position', stats.BoundingBox(kk,:),...
      'LineWidth',    3,...
      'EdgeColor',    'g',...
      'LineStyle',    ':');
end

MATLAB: Want to find the circular regions

Compute the circularities and determine the circularity that is the dividing line between a circle and non-circle

labeledImage = bwlabel(binaryImage);
props = regionprops(labeledImage, 'Area', 'Perimeter');
allAreas = [props.Area];
allPerimeters = [props.Perimeter];
circularities = allPerimeters .^ 2 ./ (4 * pi * allAreas);
acceptableCircs = circularities < 4; % Or whatever works
indexes = find(acceptableCircs);
circBlobsOnly = ismember(labeledImage, indexes);
imshow(circBlobsOnly);

Best Answer

Related Solutions

MATLAB: Extraction of rectangular blob from binary image

MATLAB: Want to find the circular regions

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