create 3*3 matrix around a given pixel

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Yuvashree Mani Urmila
回答： Mahendra Amrao 2020-9-8
I have a centroid plotted on a blank image using the command img(a(2),a(1))=1;
I would like to create a 3*3 matrix of ones around this pixel as centroid.
Can someone tell me how i can achieve this.
Thankyou

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采纳的回答

Jos (10584)
Jos (10584) 2014-7-7
One solution:
img = zeros(6,7)
a = [4 3]
img(a(2),a(1)) = 1
B = [1 1 1 ; 1 0 1 ; 1 1 1];
img2 = conv2(img, B ,'same')

更多回答（1 个）

Mahendra Amrao
Mahendra Amrao 2020-9-8
img = zeros(6,7)
a = [4 3]
img(a(2),a(1)) = 1
B = [1 1 1 ; 1 0 1 ; 1 1 1];
img2 = conv2(img, B ,'same')

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