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Circle Detection using Hough Transform

Find circles using circular Hough transform

Syntax

centers = imfindcircles(A,radius)

[centers,radii] = imfindcircles(A,radiusRange)

[centers,radii,metric] = imfindcircles(A,radiusRange)

[___] = imfindcircles(___,Name,Value)

Description

centers = imfindcircles(A,radius) finds the circles in image A whose radii are approximately equal to radius. The output, centers, is a two-column matrix containing the (x,y) coordinates of the circles centers in the image.


[centers,radii] = imfindcircles(A,radiusRange) finds circles with radii in the range specified by radiusRange. The additional output argument, radii, contains the estimated radii corresponding to each circle center in centers.



[centers,radii,metric] = imfindcircles(A,radiusRange) also returns a column vector, metric, containing the magnitudes of the accumulator array peaks for each circle (in descending order). The rows of centers and radii correspond to the rows of metric.



[___] = imfindcircles(___,Name,Value) specifies additional options with one or more Name,Value pair arguments, using any of the previous syntaxes.

Find circles using circular Hough transform MATLAB Documentation Link: https://www.mathworks.com/help/images...

clc

clear all

close all

warning off

t=0:0.001:2*pi;

x=cos(t);

y=sin(t);

plot(x,y);

axis square

pause(1);

hold on;

t=0:pi/20:2*pi;

x2=cos(t);

y2=sin(t);

t=0:0.001:2*pi;

for i=1:length(x2)

    x3=x2(i)+cos(t);

    y3=y2(i)+sin(t);

    plot(x3,y3);

    axis square

    hold on;

    pause(0.1);

    i=i+1;

end

 

Video Explanation



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