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How to convert a closed curve into a binary mask

Asked by Maura Monville on 9 Jul 2019
Latest activity Edited by KSSV
on 9 Jul 2019
Accepted Answer by KSSV
I have a set of 2D closed curves represented by their X and Y ordered coordinates in a text file.
I have attached one of the curves as an example.
My goal is to convert the enclosed area into a binary image.
Builtin dunction "poly2mask" generates a completely black square whereas I would like the region inside the closed curve to be black
and the region outside the curve to be white.
Thank you in advance for any suggestion and help.
Regards,
Maura

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R2019a

1 Answer

Answer by KSSV
on 9 Jul 2019
Edited by KSSV
on 9 Jul 2019
 Accepted Answer

data = importdata('data.txt') ;
x = data(:,1) ;
y = data(:,2) ;
N = 500 ;
xi = linspace(min(x),max(x),N) ;
yi = linspace(min(y),max(y),N) ;
[X,Y] = meshgrid(xi,yi) ;
idx = inpolygon(X,Y,x,y) ;
Z = ones(size(X)) ;
Z(idx) = 0 ;
imshow(Z)
untitled.bmp

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