How to extract point from a group of plot graph?

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I have a folder with some .png files. Please check the attachment of the folder. How can i exrtact the coordinates of the line from the figure. I have tried with the following code:
h = findobj(gca,'Type','line');
x=get(h,'Xdata');
y=get(h,'Ydata');
But with this code im getting all the coodinates from the plot. How can i extract only the coordinates of the line that is plotted in the figure i.e., the coordinates of the blue dots in the figure.

Answers (1)

KSSV
KSSV on 8 Mar 2018
I = imread('fig500.png') ;
I1 = rgb2gray(I) ;
[y,x] = find(I1==29) ;
imshow(I)
hold on
plot(x,y,'.m')

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