Clear Filters
Clear Filters

How to convert a closed curve into a binary mask

11 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.
Regards,
Maura

Accepted Answer

KSSV
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 ;
imshow(Z)
untitled.bmp

More Answers (1)

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

Categories

Find more on Convert Image Type in Help Center and File Exchange

Products


Release

R2019a

Community Treasure Hunt

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

Start Hunting!