MATLAB: Number of Object in binary image

Question

Hi, im trying to get the number of objects in an binary image but it return the wrong answer (it should be 6 but it return 31). here is the code and the image:

I=imread('2.jpg');
I_BW=im2bw(I,0.87);
I1=imcomplement(I_BW);
[L,n]=bwlabel(I1);

Answer 1

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);