MATLAB: Counting number of white objects in BW image

counting white object in bw image

I have an image, (see the attachment)

I want to count those white objects. I tried eroding and then tried to convert it to circular shaped looking objects (in order to count the number of circles)but after erosion, they don't actually convert exactly to a circular shape.

Is there any other simple way to count those objects?

Best Answer

Use this commands where Num is the number of white objects in the image.

    BW=your_binary_image;
    [L,Num] = bwlabel(BW);

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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);

MATLAB: Gray to BW

This is an excellent demo. But I use a selected area of active contour segmentation. I do not know how I took advantage of it.

Output of the segmentation are xy coordinates.

Best Answer

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MATLAB: Number of Object in binary image

MATLAB: Gray to BW

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