How to convert a closed curve into a binary mask

3 views (last 30 days)
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.

Accepted Answer

KSSV on 9 Jul 2019
Edited: KSSV on 9 Jul 2019
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 ;

More Answers (1)

Rob Campbell
Rob Campbell on 30 May 2021
I think you want the built-in function poly2mask


Find more on Graphics Object Identification in Help Center and File Exchange




Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!