Dimensions of arrays being concatenated are not consisten on workspace

i tried this code below and i still got an error and only load some images not all of them. every image has their own number of region so in one image, it could be 2, 3, or 6 areas.

or maybe if it's easier, how to just sum all of areas of each region in each image ?

clear;

folder_tbc = ('/Users/*/Documents/MATLAB/regionbased_seg/cv/TBC');

file_tbc = dir(fullfile(folder_tbc, '*png'));

jumlah_file_tbc = numel(file_tbc);

training_data_tbc = zeros(jumlah_file_tbc);

array = [];

for l = 1:jumlah_file_tbc

I = imread(fullfile(folder_tbc, file_tbc(l).name));

figure, imshow(I)

bw= imbinarize(I);

bw2 = imfill(bw,'holes');

s=regionprops(bw2, 'centroid', 'area');

centroids = cat(1, s.Centroid);

area = cat(2, s.Area);

hold on

plot(centroids(:,1), centroids(:,2),'r*')

[B,L]=bwboundaries(bw2, 'noholes');

[~,jumlah_file_tbc]=bwlabel(bw2,4);

for k=1:jumlah_file_tbc

%%for k=1 : size(bw2, 1)

boundary = B{k};

plot(boundary(:,2), boundary(:,1), 'y', 'LineWidth',2)

text(boundary(1,2), boundary(1,1), strcat(['Area =', num2str(area(k))]),'Color', 'r', 'FontSize',15, 'FontWeight','bold');

%%end

end

array = [array;area];

cell_area(l,:) = {file_tbc(l).name, area};

hold off

end

Answer 1

[DGM]

Here, you're concatenating the object areas to form a variable-length row vector.

area = cat(2,s.Area);

Here, you're trying to vertically concatenate the variable length rows.

array = [array;area];

If you want to have an array where each row corresponds to each image, then you might use a cell array instead. It seems you already have that as cell_area. You could preallocate cell_area:

cell_area = cell(jumlah_file_tbc,2); % preallocate

As to what to do with "array", I don't really know why you need it if you have the results stored in cell_area. If you want to keep a running sum or something, you could do that in the loop or simply end concatenate all the variable-length area vectors and then sum it at the end?

[fayza nayla]

cell_area = cell(jumlah_file_tbc,2); % preallocate

this basically works but only show [] instead of numbers of areas

[DGM]

Where are you putting that line? It should go outside the loop, before it starts. If it's after the loop or inside at the end of the loop, it will just overwrite the results.

[fayza nayla]

it's still giving me the same error

[Voss]

You also need to comment-out or delete the line:

array = [array;area];

because the idea was to replace "array" with "cell_area", since "array" cannot be built the way you want, since "area" is of varying length.