How to enlarge binary image background in output screen?

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Zara Khan 2018-12-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/433700-how-to-enlarge-binary-image-background-in-output-screen

回答： Image Analyst 2018-12-4

I am drawing 16 different radii circles over a binary image. I want visualize all circles that has been drawn over the image.

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Kevin Chng 2018-12-4

编辑：Kevin Chng 2018-12-4

在 MATLAB Online 中打开

imshow('pic.png')

is this what you want?

Zara Khan 2018-12-4

no that I have already but not able to visualize all circles See pic.png. larger circles are not visible

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回答（3 个）

KSSV 2018-12-4

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https://ww2.mathworks.cn/matlabcentral/answers/433700-how-to-enlarge-binary-image-background-in-output-screen#answer_350421

在 MATLAB Online 中打开

I = imread('P1_G4_9.png') ;
imshow(I)
[nx,ny] = size(I) ;
[X,Y] = meshgrid(1:ny,1:nx) ;
C = [mean(X(:)) mean(Y(:))] ;
R = 1:10:100 ;
th = linspace(0,2*pi) ;
x = cos(th) ; y = sin(th) ;
hold on
for i = 1:length(R)
    plot(C(1)+R(i)*x,C(2)+R(i)*sin(th),'r')
end

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Zara Khan 2018-12-4

Padding with back ground pixels possible so that can visualize all diameter circles ??????

KSSV 2018-12-4

use imresize and increase the dimensions of your image.

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Image Analyst 2018-12-4

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https://ww2.mathworks.cn/matlabcentral/answers/433700-how-to-enlarge-binary-image-background-in-output-screen#answer_350506

Assuming you have the circles and just need to visualize them, use viscircles().

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Image Analyst 2018-12-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/433700-how-to-enlarge-binary-image-background-in-output-screen#answer_350520

If you want all the circles you have to, for some reason, extend beyond the image, you're going to have to enlarge the image with padarray(), NOT imresize().