How to Create Graded lines inside the binary circle mask?

Question

fred bnm 2018-5-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/401747-how-to-create-graded-lines-inside-the-binary-circle-mask

编辑： fred bnm 2018-5-22

I have a binary circle mask. and i need create new binary mask from that with Graded lines inside the circle.Degrees is 45,90,135,180. please guide me.

 clc; clear;
 %%create circle mask
 mask = zeros(400,600);
 position = [200,300];
 cx = position(1);
 cy = position(2);
 r = 50;
 [ix,iy] = size(mask);
 [x,y]=meshgrid(-(cx-1):(ix-cx),-(cy-1):(iy-cy));
 c_mask=((x.^2+y.^2)<=r^2)';
 figure,imshow(c_mask)
 %%Create Graded lines inside the circle.
 %find center of circle
 BW = c_mask;
 prob = regionprops(BW,'centroid');
 center = prob.Centroid;
 figure, imshow(BW)
  hold on
 plot(center(1),center(2),'rx','MarkerSize',18,'LineWidth',2);

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

KSSV 2018-5-21

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/401747-how-to-create-graded-lines-inside-the-binary-circle-mask#answer_321155

在 MATLAB Online 中打开

YOu decide the angles needed, and use this:

th = [45,90,135,180] ; 
 x = center(1)+r*cos(th) ; 
 y = center(2)+r*sin(th) ;
 for i = 1:length(th)
     plot([center(1) x(i)],[center(2) y(i)],'r')
 end