No value in centers when using imfindcircles

Hello, im trying to detect a circle caused fungi using imfindcircles function. But when i checked workspace there are no values in centres, radii, and metric that leads to Index exceeds matrix dimensions. Can anyone help me, please?

this is the script i used:

A=imread('1.jpg');

imshow(A)

B=rgb2gray(A);

figure, imshow(B)

[centers, radii, metric] = imfindcircles(A,[15 30]);

X= centers(1:1,:);

Y= radii(1:1);

Z= metric(1:1);

viscircles(X, Y,'EdgeColor','b');

[KALYAN ACHARJYA]

Please do share image 1 (Use Clip Attach)

Please do explain, what you are trying to with 1:1?

[Firecky Dwika]

detecting a single circle, here is the picture i use:

Answer 1

[KALYAN ACHARJYA]

A=imread('1.jpg');
imshow(A);
B=rgb2gray(A);
figure,imshow(B)
[centers,radii,metric]=imfindcircles(A,[1 100]);
%........................................^^ change this as per requiremnets
viscircles(centers,radii,'EdgeColor','b');

See the results in case of my sample image

Please do read about return colm metric here.

Hope it helps!

[Firecky Dwika]

Thank you so much!!

[KALYAN ACHARJYA]

you're welcome