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How to convert a closed curve into a binary mask

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Maura E. Monville
Maura E. Monville 2019 年 7 月 9 日
回答済み: Rob Campbell 2021 年 5 月 30 日
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

採用された回答

KSSV
KSSV 2019 年 7 月 9 日
編集済み: KSSV 2019 年 7 月 9 日
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

その他の回答 (1 件)

Rob Campbell
Rob Campbell 2021 年 5 月 30 日
I think you want the built-in function poly2mask

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