how can ignore the other circle in the below image and extract the markers only

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Mustafa Alhandhali 2019-3-25

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https://ww2.mathworks.cn/matlabcentral/answers/452134-how-can-ignore-the-other-circle-in-the-below-image-and-extract-the-markers-only

评论： Mustafa Alhandhali 2019-3-26

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i want extract the circle on the markers only , this is the code i use

%extract all frames of the video 
a=VideoReader('walk.avi');
for img = 1:a.NumberOfFrames;
    filename=strcat('frame',num2str(img),'.jpg');
    b = read(a, img);
    imwrite(b,filename);
end
I = imread('frame11.jpg')
Ibw = im2bw(I);
Ibw = imfill(Ibw,'holes');
Ilabel = bwlabel(Ibw);
stat = regionprops(Ilabel,'centroid');
imshow(I); hold on;
for x = 1: numel(stat)
  plot(stat(x).Centroid(1),stat(x).Centroid(2),'ro');
end 
grid on;
axis on;
hAx=gca;% make the y cordinate not flip
ytk=hAx.YTick;
hAx.YTickLabel=max(ytk)-ytk;