how to remove error "Conversion to cell from uint8 is not possible." in the line R(k) = cell2mat(R(k));?

clc;

close all;

clear;

myFolder='D:\WORK\major project';

m=input('Type the Number of Images to Process:');% Ask the amount of image to process

for k = 1:m

tiffFilename = sprintf('image%d.tiff', k);

fullFileName = fullfile(myFolder, tiffFilename);

if exist(fullFileName, 'file')

imageData = imread(fullFileName);

IMAGE(k)= mat2cell(imageData);

else

warningMessage = sprintf('Warning: image file does not exist:\n%s', fullFileName);%if file doesent exist sends an error message

uiwait(warndlg(warningMessage));

end

end

for k = 1:m

temp = cell2mat(IMAGE(k));

R(k) = mat2cell(temp(:,:,1)); %<1*1>cell containing matrix of size 256*256 uint8%

G(k) = mat2cell(temp(:,:,2));

B(k) = mat2cell(temp(:,:,3));

R(k) = cell2mat(R(k));

B(k) = cell2mat(B(k));

G(k) = cell2mat(G(k));

L(k)= horzcat(R(k),G(k),B(k));

%concatenation%

end

for k = 2:m

V = vertcat(L(k-1),L(k));

end

Answer 1

[Prathamesh]

Hi @shashwat soni,

I understand that you are getting an error “Conversion to cell from uint8 is not possible”.

This happens because you are trying to assign a numeric array from “cell2mat”into a cell array element, or vice versa. You are using arrays like IMAGE(k) and R(k) as if they are cell arrays, but you did not initialize them as such. If you just want to store matrices, do not wrap them as cells unless you specifically want cell arrays.

“R(k) = cell2mat(R(k)); “

is problematic because R(k) is already a matrix, not a cell.

Below is a revised version of your code:

clc;
close all;
clear;

myFolder = 'D:\WORK\major project';
m = input('Type the Number of Images to Process: '); % Number of images

IMAGE = cell(1, m); % Preallocate as cell array

for k = 1:m
    tiffFilename = sprintf('image%d.tiff', k);
    fullFileName = fullfile(myFolder, tiffFilename);
    if exist(fullFileName, 'file')
        imageData = imread(fullFileName);
        IMAGE{k} = imageData; % Store directly as cell
    else
        warningMessage = sprintf('Warning: image file does not exist:\n%s', fullFileName);
        uiwait(warndlg(warningMessage));
    end
end

R = cell(1, m);
G = cell(1, m);
B = cell(1, m);
L = cell(1, m);

for k = 1:m
    temp = IMAGE{k};
    R{k} = temp(:,:,1); % Store as cell
    G{k} = temp(:,:,2);
    B{k} = temp(:,:,3);
    L{k} = horzcat(R{k}, G{k}, B{k}); % Concatenate and store as cell
end

% If you want to vertically concatenate all images:
V = L{1};
for k = 2:m
    V = vertcat(V, L{k});
end