Index exceeds the number of array elements. Index must not exceed 4.

Question

fayza nayla 2023-1-4

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https://ww2.mathworks.cn/matlabcentral/answers/1888387-index-exceeds-the-number-of-array-elements-index-must-not-exceed-4

评论： Mathieu NOE 2023-1-4

cell_areas variable contains all of the files name of images in one folder and the sum or area that every image has. The problem is that in workspace, it only loads some images, not all of them.

Note : every image has their own variety in number of regions, in each image there could be 1 or 2 or 3 or so regions and i want to sum each of its area and save it to cell_areas variable

clear;

clear clc;

folder_nrml = ('/Users/*/Documents/MATLAB/regionbased_seg/cv/NORMAL');

file_nrml = dir(fullfile(folder_nrml, '*jpeg'));

jumlah_file_nrml = numel(file_nrml);

training_data_nrml = zeros(jumlah_file_nrml);

array = [];

for l = 1:jumlah_file_nrml

I = imread(fullfile(folder_nrml, file_nrml(l).name));

figure, imshow(I)

bw= imbinarize(I);

bw2 = imfill(bw,'holes');

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

centroids = cat(1, s.Centroid);

area = cat(1, s.Area);

sum_area = sum(area);

%%cell_area = cell(jumlah_file_tbc, 2);

hold on

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

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

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

cell_area = cell(jumlah_file_tbc, 2);

for k=1:jumlah_file_nrml

%%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; sum_area];

%cell_area(l,:) = cell(file_tbc(l).name,area);

cell_areas(l,:) = {file_nrml(l).name, sum_area};

hold off

end

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Mathieu NOE 2023-1-4

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hello

why are you doing the same for loop twice ?

the inner loop is for what ?

    for k=1:jumlah_file_nrml
       %%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

I would suppose there is only one for loop and the section I extracted above should be run in the main loop directly

so the code should look like :

    clear;
clear clc;
folder_nrml = ('/Users/*/Documents/MATLAB/regionbased_seg/cv/NORMAL');
file_nrml = dir(fullfile(folder_nrml, '*jpeg'));
jumlah_file_nrml = numel(file_nrml);
training_data_nrml = zeros(jumlah_file_nrml);
array = [];
for l = 1:jumlah_file_nrml
    I = imread(fullfile(folder_nrml, file_nrml(l).name));
    
    figure, imshow(I)
   
    bw= imbinarize(I);
    bw2 = imfill(bw,'holes');
    
    s=regionprops(bw2, 'centroid', 'area');
    centroids = cat(1, s.Centroid);
    area = cat(1, s.Area);
    sum_area = sum(area);
    %%cell_area = cell(jumlah_file_tbc, 2);
    hold on
    plot(centroids(:,1), centroids(:,2),'r*')
    
    [B,L]=bwboundaries(bw2, 'noholes');
    [~,jumlah_file_nrml]=bwlabel(bw2,4);
    cell_area = cell(jumlah_file_tbc, 2);
%     for k=1:jumlah_file_nrml
       %%for k=1 : size(bw2, 1)
%            boundary = B{k};
           boundary = B;
           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; sum_area];
    %cell_area(l,:) = cell(file_tbc(l).name,area);
    cell_areas(l,:) = {file_nrml(l).name, sum_area};
    hold off
end