Area calculation for patches

Dear sir,

I want to find the area of the patches,which is the no of pixels within the region.How it is calculated? also i want to calculate the area of patches in the black region only.Please help sir

[KSSV]

How did you generate the patches?

[ATHIRA P M]

Dear sir,

I use simple linear iterative clustering algorithm.the program is attached below

A = imread('capture1.jpg');

[L,N] = superpixels(A,100);

figure

BW = boundarymask(L);

imshow(imoverlay(A,BW,'cyan'),'InitialMagnification',67)

Answer 1

[KSSV]

I = imread('capture1.jpg');
 [L,N] = superpixels(I,100);
 figure
BW = boundarymask(L);
imshow(imoverlay(I,BW,'cyan'),'InitialMagnification',67)
% Area of each patch 
A = zeros(N,1) ;
for i = 1:N
    A(i) = nnz(L==i) ;  % area in pixels 
end

[ATHIRA P M]

dear sir,

How know which patch area is calculated,how the patches are numbered?

Also if the individual patch area calculated separately.The figures are attached below.How the area calculated?