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Segmentation of the microscope circle

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I would like to remove the black area(background) of these images so that I can segment only the targetted region, which is the circle. Please help, thank you in advance.
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Ramanaesh Rao
Ramanaesh Rao 23 Mar 2021
Hi, yes I did but i lost the region of interest too.

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KALYAN ACHARJYA
KALYAN ACHARJYA 23 Mar 2021
편집: KALYAN ACHARJYA 23 Mar 2021
You can direct thresold the largest black area. Here the shown code is quite lengthy, but it is easier to understand.
bwImage=imbinarize(rgb2gray(rgbImage));
mask=bwareafilt(~bwImage,1);
R_data=rgbImage(:,:,1);
G_data=rgbImage(:,:,2);
B_data=rgbImage(:,:,3);
R_data(mask)=255;
G_data(mask)=255;
B_data(mask)=255;
result=cat(3,R_data,G_data,B_data);
figure,imshow(result);
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Ramanaesh Rao
Ramanaesh Rao 23 Mar 2021
Thank you so much sir.

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