Counting objects doesn't hit the correct value

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Carlos
Carlos 2014-4-2
回答： Image Analyst 2014-4-2
Hello, I need to count objects from different images, they are seem as this one: There are 3 objects, but when I do my code, it sais there are 7 objects. I have more photos, sometimes it hit the value, and other times doesn't. Any idea to correct this?
I=imread('imgPM101');
imshow(I)
I2=imadjust(I);
level=graythresh(I);
bw = im2bw (I, level);
bw = bwareaopen (bw, 50);
bw = ~bw;
imshow(bw)
[labeled,numObjects] = bwlabel(bw,8);
numObjects
Thank you.

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Image Analyst
Image Analyst 2014-4-2
Try the attached test.m (below in blue text), which will produce the 3 blobs:

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