![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/718509/image.jpeg)
i want to detecting bubble in the image and measuring the size
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![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/718489/image.bmp)
i used imbinarize,strel,wiener2,bwareafilt,medfilt2,filter2 and dipimage fuction
but i can't get a satisfied picture
and if i want to ftltering the range of dark (90~100) what fuction do i have to use?
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Accepted Answer
Wan Ji
on 23 Aug 2021
Use DCT transformation and with a critical bw value
I=double(imread ('image.bmp'));
I = -(I-min(I(:)))/(min(I(:))-max(I(:)));
%DCT transformation
[m,n]=size(I);
Y=dct2(I);
I=zeros(m,n);
I(1:floor(m/10),1:floor(n/10))=1;
Ydct=Y.*I;
Y=(idct2(Ydct));
I = -(Y-min(Y(:)))/(min(Y(:))-max(Y(:)));
I (I>0.83) = 0;
I (I~=0) = 1;
imshow(I)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/718509/image.jpeg)
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