how to count big cell only?

I have image with different cell size but I want Count the number of big cells only!!

I try this code:

A = imread ('cell.png');
level=graythresh(A);
I=im2bw(A,level);
[labeled,numObjects]=bwlabel(I,4)
numObjects = 26

Answer 1

[Dishant Arora]

use bwareaopen to remove objects smaller than certain number of pixels.

 BW2 = bwareaopen(BW, thresh);
[~, numObjects] = bwlabel(BW2,4);

[Moon Shadow]

It did nit worked with me!!

It calculate small and big cells.

I = imread('cell.png'); EDU>> imshow(I); EDU>> bw = im2bw(I); EDU>> figure,imshow(bw);

EDU>> BW2 = bwareaopen(bw, 1000); EDU>> figure,imshow(BW2); [labeled,numObjects]=bwlabel(BW2,4) numObjects = 10

[Dishant Arora]

Check out for 8-connectivity when using bwlabel or attach your image.

Answer 2

[Image Analyst]

See my code to extract the largest blob, attached below in blue. In there, there is a general purpose function I wrote that can take the N largest or smallest blobs in a binary image.