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How to count the number of object present in binary image?

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Hanuman Wable
Hanuman Wable on 20 Dec 2013
Commented: Image Analyst on 7 Nov 2018
Hello sir, i am going to count the number of object present in binary image. so any of you please suggest me regarding counting object.because i have problem during count such object. thank you

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Answers (4)

Sabarinathan Vadivelu
Sabarinathan Vadivelu on 20 Dec 2013
Edited: Sabarinathan Vadivelu on 20 Dec 2013
You can use bwconncomp.
cc = bwconncomp(yourBinaryImage,4);
number = cc.NumObjects;

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Image Analyst
Image Analyst on 20 Dec 2013
Here's yet another way
[labeledImage, numberOfObject] = bwlabel(binaryImage);

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romaisa sabih
romaisa sabih on 18 May 2016
sir,i have to count the active fingers in my image.how can i do this ? please help.

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David Sanchez
David Sanchez on 20 Dec 2013
If you are planning to do something with those objects, you could be interested in using regionprops. Besides the number of objects within the image, you can retrieve any other property of the objects, such as the area, centroid, orientation,....
BW = imread('text.png');
s = regionprops(BW, 'Area');
N_objects = numel(C);
For all the options, take a look at
doc regionprops

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muhamad zulhairi zailan
muhamad zulhairi zailan on 7 Nov 2018
hello sir, how to count the object using area parameter, which mean i have the image and i want to count the object in that image using range of area parameter and i want to count the object refer to it area parameter? thanks sir your reply very appreciated.
Image Analyst
Image Analyst on 7 Nov 2018
I don't know what you want. By the way, the code above is not correct. It should say
N_objects = length(s)
That number will be the same regardless which attributes you measure (area, perimeter, or whatever).

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sanhita das
sanhita das on 7 Apr 2018
sir,i want to show paragraphs from document image.pls tell the algoritm name. I attach a input file.and how to extract paragraph from this image.please help me

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