Counting objects in an image

2013 1 7
4 个回答
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更新时间：2021 8 5
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0 个投票

Dear Researchers, I have a problem of counting objects in an image. Suppose I have the below image (below link)
http://s20.postimage.org/bah41jkml/test1.jpg
which i got after segmentation.
how can I count the small circles in the middle of the image. Kindly suggest
Subrajeet

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Image Analyst
Image Analyst 2013-1-7
编辑：Image Analyst 2013-1-7

4 个投票

  1. Binarize the image so that it's logical. binaryImage = grayImage > 128
  2. Call binaryImage = imclearborder(binaryImage) to get rid of the single line around the perimeter.
  3. Invert the image: binaryImage = ~binaryImage, so now black circles are white
  4. Call binaryImage = imclearborder(binaryImage) to get rid of the large (now white) background
  5. Call bwlabel: [labeledImage, numberOfCircles] = bwlabel(binaryImage). This gives you the count.
  6. Call measurements = regionprops(labeledImage) if you want other measurements
See my Image Segmentation Tutorial in my File Exchange if you want an example.

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subrajeet
subrajeet 2013-1-7
@Image Analyst from core of my heart I want to thankyou. Really I could not do it from yesterday. But one one thing can you tell me using which image processing technique this was achieved.
Thanks a lot again.
Image Analyst
Image Analyst 2013-1-7
编辑：Image Analyst 2013-1-7
It's just basic, elementary image segmentation via intensity thresholding. Nothing fancy at all. See updated instructions above.

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更多回答（3 个）

Thomas
Thomas 2013-1-7
编辑：John Kelly 2017-11-8

0 个投票

You could use techniques shown in many MATLAB image processing demos.

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subrajeet
subrajeet 2013-1-7
Thomas U can see in my image the circular objects in the centre have immideate neighbors as white pixels. But again beyond white pixels I have black pixels. So i could not understand how can I have the access over the center circles. I desire if by some means I can assign the outer black pixels as 1 or make them white then I can count the circles. But I am unable to do that.

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SANAHA PATHAN
SANAHA PATHAN 2016-7-25

0 个投票

i want to count number of silkworm eggs from this figure, i used L=Count(binaryfig) this command for counting number of objects ,this command works but i actually dont know what actually this command count,and result of this command is different every time

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Image Analyst
Image Analyst 2016-7-25
SANAHA, take a look at this link and then if you still have questions, post a new Question (not here) and upload your code and image(s). We actually don't know what your Count() function does either so be sure that's included in the code you upload.
anna
anna 2016-10-5
编辑：anna 2016-10-5
hey I segmented blue nuclei from a blood smear image using k means color segmentation. how can i count the number of segmented blue nuclei. could u please help me with the code for counting [ cant use imfindcircle because the segmented nuclei are not exactly cirlce in shape ]

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Beenish Ishtiaq
Beenish Ishtiaq 2021-8-3

0 个投票

Need code for counting different shapes separatelly which shows each shape result respectively in different edit boxes in GUI matlab..

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Image Analyst
Image Analyst 2021-8-3
See my attached demos. I find that usually using findpeaks() to count the number of peaks in the plot of distance of perimeter from centroid works pretty well.
Beenish Ishtiaq
Beenish Ishtiaq 2021-8-5
error in ''catch''

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