how to extract the area of highlighted circle from the original image? I don't want to include part 2 area. I have attached original file along with the highlighted file

Answer 1

[KALYAN ACHARJYA]

This one:

#Step 1: Morphological Operation to remove those unwanted Region (You may avoid Morpho operation. Please see the difference in axex lengths and centroid without using morpho operation)

bwImage=imread(.....)
se=strel('disk',60);
BW1=imerode(bwImage,se);
BW2=imdilate(BW1,se);
figure,imshow([bwImage,BW2]);

Step 2: Get the circles (Get the properties using regionprops function and Draw circles using viscircles)

figure,imshow(bwImage);
hold on;
stats= regionprops(BW2,'Centroid','MajorAxisLength','MinorAxisLength')
centers=stats.Centroid;
diameters = mean([stats.MajorAxisLength stats.MinorAxisLength],2);
viscircles(stats.Centroid,diameters/2,'Color','b');

Result:

Hope it Helps!

Kalyan:)

[P VINOD NAIDU]

Its working fine.

Thank you for your solution.

[KALYAN ACHARJYA]

I'm glad my answer helped you.