# How to convert a closed curve into a binary mask

조회 수: 37(최근 30일)
Maura E. Monville 2019년 7월 9일
답변: Rob Campbell 2021년 5월 30일
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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### 채택된 답변

KSSV 2019년 7월 9일
편집: KSSV 2019년 7월 9일
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)

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### 추가 답변(1개)

Rob Campbell 2021년 5월 30일
I think you want the built-in function poly2mask

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