MATLAB: Why does `imfill` fill the whole image

image processing

Hi! I converted my image from HSV to bw, and then use `bwareaopen` to eliminate some background noise. After that I still find some 'holes' in the white disks that I need. So I was thinking to use 'imfill' to eliminate the holes. However, after 'infill', I either get a white image showing nothing (this happens when I didn't save the image out and directly called 'imfill' after `bwareaopen`) or the same image as after bwareaopen`. I don't understand why. Could somebody help me out? Thank you!

my codes:

bwIm2=bwareaopen(bwIm,10)
bw=imfill(bwIm2,'holes')

Best Answer

You should delete light area connected to image border before applying imfill. By using imclearborder function before applying imfill, you can obtain the target image, like:

bwTmp = imclearborder(bwIm);
bw = imfill(bwTmp,'holes');

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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);
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[labeledImage, numBlobs] = bwlabel(bw);
fprintf('Found %d shapes.\n', numBlobs);

MATLAB: I need a function that acts like a function bwareaopen(BW, P) but the amount P to remove larger

https://www.mathworks.com/help/images/ref/bwareafilt.html

Best Answer

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MATLAB: Number of Object in binary image

MATLAB: I need a function that acts like a function bwareaopen(BW, P) but the amount P to remove larger

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