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how to save image of the result imfindcircle

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raja gopal
raja gopal on 19 Dec 2015
Answered: Michal Heker on 24 Sep 2020
i have used imfindcircle to find circle object in image. do you know how to save the image result of the circle object detected?
  1 Comment
Image Analyst
Image Analyst on 19 Dec 2015
What kind of result do you want? The function imwrite() saves images - why can't you use that? Please explain why that won't work but only after you read this.

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Accepted Answer

harjeet singh
harjeet singh on 20 Dec 2015
dear raja, most probable you are using viscircles to highlighter the circles, this commands uses superimposing of graph over the image not actually changes the pixel values.
use this program to save circles with markings
clear all
close all
clc
A = imread('coins.png');
figure(1)
imshow(A)
drawnow
[centers, radii, metric] = imfindcircles(A,[15 30]);
centersStrong5 = centers(1:5,:);
radiiStrong5 = radii(1:5);
metricStrong5 = metric(1:5);
%/////// this command makes plot superimpose on the image not the pixels change permanently
viscircles(centersStrong5, radiiStrong5,'EdgeColor','b');
imwrite(A,'image_out_1.jpg');
%/////// for changing the values of the pixels in the image for making circle //////
B(:,:,1)=A;
B(:,:,2)=A;
B(:,:,3)=A;
for i=1:length(radiiStrong5)
theta=0:1:360;
r=round(centersStrong5(i,1) + radiiStrong5(i)*sin(theta));
c=round(centersStrong5(i,2) + radiiStrong5(i)*cos(theta));
for j=1:length(r)
B(c(j),r(j),:)=[0 0 255];
end
end
figure(2)
imshow(B)
drawnow
imwrite(B,'image_out_2.jpg');
  4 Comments
raja gopal
raja gopal on 3 Feb 2016
hello how to make marking circle become thicker? please help :(

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More Answers (2)

Alejandro Navarro
Alejandro Navarro on 20 Mar 2019
Hello.
instead of saving the output of a viscircles + image to a file, I would like to assign it as a variable. I have tried "imfuse(Image,Circles)" but this does not work because the circles are not an image, but a "matlab.graphics.primitive.Group". How would I do that related task?
Thanks

Michal Heker
Michal Heker on 24 Sep 2020
How about making a circles mask with imdilate and a disk element structure?
Something like this:
BW = zeros(size(I,1),size(I,2));
for i = 1:length(points)
landmarksMask(points(i,2),(points(i,1)) = 1;
end
BW = imdilate(BW, strel('disk',3));
And duplicate your image with BW.

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