recognize count white dots in grey background

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Sezar 2014-11-10

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https://ww2.mathworks.cn/matlabcentral/answers/162094-recognize-count-white-dots-in-grey-background

评论： Mohammad Abouali 2014-11-10

Hi, i' m a college student, and i need your help. I have some images of Microscope (with white points) on gery background and i need to recognize the count of dots. can someone recommend some links about those problems?

thanks!

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Chad Greene 2014-11-10

Can you upload an example image?

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Answer 1

Mohammad Abouali 2014-11-10

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https://ww2.mathworks.cn/matlabcentral/answers/162094-recognize-count-white-dots-in-grey-background#answer_158398

在 MATLAB Online 中打开

Generally this should work. Use graythresh and im2bw to make a mask of white dots and then use bwconncomp to count them.

Check this example, here . pay attentention to the line that it counts the grains

cc = bwconncomp(bw, 4)
cc.NumObjects

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Sezar 2014-11-10

thanks for reply. may you edit the source that print count of dots? best regards.

Mohammad Abouali 2014-11-10

在 MATLAB Online 中打开

cc.NumObjects would be the count of dots.

so one way to display it is:

disp(cc.NumObjects)

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Answer 2

Image Analyst 2014-11-10

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That's exactly what my Image Segmentation Tutorial does. Find it in my File Exchange Replace the standard coins demo image with yours and change the threshold value and you should be all set.