MATLAB: Deleting objects from a binary image.

digital image processingimage processingImage Processing Toolbox

Hello everyone. I have a binary image with different objects. In the image I want to remove 5th, 13th, and 20th objects. How can I remove it. Thnks.

Best Answer

L = bwlabel(bw); %where bw is your binary image
bw2 = bw; %copy of binary image
bw2(L==5) = 0; %deletes the 5th object

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MATLAB: Segment the image into separate objects

Use imfreehand() followed by poly2mask().

MATLAB: Number of Object in binary image

Try this:

bw = imread('bw.png');
if ndims(bw) > 1
	bw = bw(:,:,1);
end
% Threshold
bw = bw > 128;
subplot(1, 2, 1);
imshow(bw, []);
% Fill holes
bw = imfill(bw, 'holes');
% Get areas
props = regionprops(bw, 'Area');
sortedAreas = sort([props.Area], 'descend')
% Looks like we need to throw away any blobs less than 1000 pixels or so
bw = bwareaopen(bw, 1000);
subplot(1, 2, 2);
imshow(bw);
% Count the blobs
[labeledImage, numBlobs] = bwlabel(bw);
fprintf('Found %d shapes.\n', numBlobs);

Best Answer

Related Solutions

MATLAB: Segment the image into separate objects

MATLAB: Number of Object in binary image

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