Counting the number of adjacent binary points in a matrx

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Rollo 2016-6-17

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https://ww2.mathworks.cn/matlabcentral/answers/290556-counting-the-number-of-adjacent-binary-points-in-a-matrx

I am writing a function to count the number of adjacent binary true values in a matrix, and the number of these clusters in a matrix. Adjacent points are connected at either at least one of the top, bottom or sides.

For example, the function run on this matrix would return:

cluster = [10]

as there are 10 points in a single cluster, and the function run on this matrix:

would return

cluster = [1 1 1 1]

as there are 4 separate clusters, each with one point in. length(cluster) should equal the number of clusters in the image, and sum(cluster) == sum(A==1). Could I have some help in writing this function? I have thought to find the indices where the array = 1, then look to see if they are adjacent. It works in counting the single points, but it breaks down when counting the points in a larger cluster.

Minimal working example.

 B = rand(10);
 A = zeros(size(B));
 A(B>0.9) = 1;
 [row,col] = find(A(:,:,1)==1);
 cluster = 1;
 for i = 1:length(row)-1
    count = abs(row(i+1)-row(i))<2 && abs(col(i+1)-col(i))<2;
    if count == 1
        cluster = cluster+count;
    elseif count == 0
        cluster = [cluster 1];
    end
 end