how to find connected neighbors?

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jenifer Ask
jenifer Ask on 13 Nov 2019
Answered: KSSV on 13 Nov 2019
How do I find a neighbor of pixels with a neighbor whose value is 1?
(Loop to find connected neighbors)
I tried to run the operation on this code but failed
[y,x] = find(I) ;
figure
imshow(I)
hold on
plot(x,y,'.b')
i=x(100)
j=y(100)
neighbors(1) = I(i-1,j-1);
plot(i-1,j-1,'*r')
neighbors(2) = I(i-1,j);
plot(i-1,j,'*r')
neighbors(3) = I(i-1,j+1);
plot(i-1,j+1,'*r')
neighbors(4) = I(i,j-1);
plot(i,j-1,'*r')
neighbors(5) = I(i,j+1);
plot(i,j+1,'*r')
neighbors(6) = I(i+1,j-1);
plot(i+1,j-1,'*r')
neighbors(7) = I(i,j);
plot(i,j,'*r')
neighbors(8) = I(i+1,j);
plot(i+1,j,'*r')
neighbors(9) = I(i+1,j+1);
plot(i+1,j+1,'*r')

Accepted Answer

KSSV
KSSV on 13 Nov 2019
If you know the location of the pixel..uou can use knnsearch or rangeseach. YOu can also search in mathworks, this question has been addressed multiple times.

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