How can I detect the number of circles on the picture on MATLAB?

Question

H Y 2018-1-16

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/377304-how-can-i-detect-the-number-of-circles-on-the-picture-on-matlab

回答： michio 2018-1-16

采纳的回答： michio

在 MATLAB Online 中打开

I'm working to detect the number of circles on the picture with the following tips. imfindcircles

dots.png

While executing the following code, there are several errors, and I hope to hear advice to fix it.

A = imread('dots.png');
imshow(A)
Rmin = 0;
Rmax = 600;
[centersDark, radiiDark] = imfindcircles(A,[Rmin Rmax],'ObjectPolarity','dark');
viscircles(centersDark, radiiDark ,'Color','w');

errors

Error using imfindcircles>parseInputs (line 240)
The value of 'RadiusRange' is invalid. Expected input number 2, RADIUS_RANGE, to be positive.
Error in imfindcircles (line 142)
parsedInputs  = parseInputs(varargin{:});
Error in trial1_16 (line 8)
[centersDark, radiiDark] = imfindcircles(A,[Rmin Rmax],'ObjectPolarity','dark');

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Answer 1

michio 2018-1-16

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https://ww2.mathworks.cn/matlabcentral/answers/377304-how-can-i-detect-the-number-of-circles-on-the-picture-on-matlab#answer_300272

在 MATLAB Online 中打开

As the error message states that "The value of 'RadiusRange' is invalid. Expected input number 2, RADIUS_RANGE, to be positive.", the range have to be a set of positive integers.

Could you try

Rmin = 1;

instead of 0?