Index in position 1 exceeds array bounds

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Teik Jin Lim
Teik Jin Lim am 4 Nov. 2019
Bearbeitet: Adam Danz am 5 Nov. 2019
Hi, I am running the Circular Hough Transform code (from Matlab) with different image inputted. However there is an error popping out mentioned that "Index in position 1 exceeds array bounds". I don know what is the reason behind it. Please help me on this !
A = imread('circle.png');
imshow(A);
[centers, radii, metric] = imfindcircles(A,[15 30]);
centersStrong5 = centers(1:5,:);
radiiStrong5 = radii(1:5);
metricStrong5 = metric(1:5);
viscircles(centersStrong5, radiiStrong5,'EdgeColor','b');
  2 Kommentare
Adam Danz
Adam Danz am 4 Nov. 2019
Bearbeitet: Adam Danz am 5 Nov. 2019
What line is causing the error?
Sharing the error message is helpful but you should share the entire copy-pasted error message and indicate which line is causing the error.
"Index in position 1 exceeds array bounds" is quite informative. It means you're asking for values that don't exist. Here's an example:
a = [1 2 3 4 5]
a(6) % But there is only 5 values! Error!
Teik Jin Lim
Teik Jin Lim am 5 Nov. 2019
Bearbeitet: Teik Jin Lim am 5 Nov. 2019
Hi,
I think I pasted the whole error that pop out on my command window. Only "Index in position 1 exceeds array bounds" is shown which put me in a confuse situation.
But in this error, which line is represented as position 1 ?

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David Hill
David Hill am 4 Nov. 2019
If imfindcircles finds less than 5 circles you are going to error.
A = imread('circle.png');
imshow(A);
[centers, radii, metric] = imfindcircles(A,[15 30]);
a=max(5,length(centers));
centersStrong5 = centers(1:a,:);
radiiStrong5 = radii(1:a);
metricStrong5 = metric(1:a);
viscircles(centersStrong5, radiiStrong5,'EdgeColor','b');
  5 Kommentare
Walter Roberson
Walter Roberson am 5 Nov. 2019
I keep getting caught myself in thinking that the operation "at least so-many" should be a min() operation, because you want a minimum of so-many.
Teik Jin Lim
Teik Jin Lim am 5 Nov. 2019
Yea. You solve that issue for me.
But sadly, when I try it with other image it doens't seems like working even though there is no error. I changed the sensitivy and radius, but the output is the same. No circle detected.

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