Matlab 画九点圆

%画九点圆

clear;

width=1920  ;      %pattern的宽

height=1080    ;          %pattern的高

img_final=zeros(height,width);

r = 40;

img = zeros(r*2+1);

for m = 1:r*2+1

    for n = 1:r*2+1

        if (m-r-1)^2+(n-r-1)^2 < r^2

            img(m,n) = 1-(((m-r-1)^2+(n-r-1)^2)/(r^2))^2;

        end

    end

end

imshow(img)

scale = 0.5;%偏移比例

org_X = round(scale * (height/2));

org_Y = round(scale * (width/2));

img_final(org_X-r:org_X+r,org_Y-r:org_Y+r)=img;

img_final(org_X-r:org_X+r,width/2-r:width/2+r)=img;       

img_final(org_X-r:org_X+r,width-org_Y-r:width-org_Y+r)=img;

img_final(height/2-r:height/2+r,org_Y-r:org_Y+r)=img;

img_final(height/2-r:height/2+r,width/2-r:width/2+r)=img;       

img_final(height/2-r:height/2+r,width-org_Y-r:width-org_Y+r)=img;

img_final(height-org_X-r:height-org_X+r,org_Y-r:org_Y+r)=img;

img_final(height-org_X-r:height-org_X+r,width/2-r:width/2+r)=img;       

img_final(height-org_X-r:height-org_X+r,width-org_Y-r:width-org_Y+r)=img;

imshow(img_final)

imwrite(img_final,'nineCircle.png','png');