How to store images in a single array or matrix

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Bashir
Bashir 2013-5-27
编辑： DGM 2023-2-12
Hello, i have a number of jpeg images stored in a folder; how can i read all the images and store them as a single matrix or array (reserving the image format).

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Image Analyst
Image Analyst 2013-5-27
Straight out of the FAQ:
myFolder = 'C:\Documents and Settings\yourUserName\My Documents\My Pictures';
if ~isdir(myFolder)
errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
uiwait(warndlg(errorMessage));
return;
end
filePattern = fullfile(myFolder, '*.jpg');
jpegFiles = dir(filePattern);
for k = 1:length(jpegFiles)
baseFileName = jpegFiles(k).name;
fullFileName = fullfile(myFolder, baseFileName);
fprintf(1, 'Now reading %s\n', fullFileName);
imageArray = imread(fullFileName);
imshow(imageArray); % Display image.
drawnow; % Force display to update immediately.
end
Obviously, you can adapt as needed, because I'm not sure what you mean when you say "store them as a single matrix". There is a montage() function that will do that if that's what you want. It will stitch together all the image files into one giant image.
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Ganesh Gajavelli
Ganesh Gajavelli 2017-6-28
编辑：Ganesh Gajavelli 2017-6-28
One thing to look out for with montage() is that it requires all of the pictures to be of the same dimensions. But thanks anyways!
Ganesh Gajavelli
Ganesh Gajavelli 2017-6-28
编辑：Ganesh Gajavelli 2017-6-28
Another thing that could be useful is imageSet() Maybe this could work.

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更多回答（5 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-5-27
f=dir('*.jpg')
files={f.name}
for k=1:numel(files)
Im{k}=imread(files{k})
end
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Jan
Jan 2019-3-11
[MOVED from flags] UKM wrote:
Very simple and Very perfect>> Thanks alot.
@UKM: Please use flags only to inform admins and editors about inappropriate content like sopam or rudeness.
Abhishek Singh
Abhishek Singh 2019-7-2
@Image Analyst After I have the array for the images can I compare those images without using loop? I need to compare two images using ssim() which was suggested by you only but I think loop is very slow in Matlab I was looking for something in arrays and vectors which could help me.

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Shelly Smith
Shelly Smith 2017-2-15
编辑：Image Analyst 2017-2-15
Hey
I have a problem and will be grateful if someone help me. I am reading 200 images through this code:
folder = 'C:\Users\whatever'
filePattern = fullfile(folder, '*.pgm');
f=dir(filePattern)
files={f.name}
for k=1:numel(files)
fullFileName = fullfile(folder, files{k})
cellArrayOfImages{k}=imread(fullFileName)
imshow(cellArrayOfImages{k});
end
I get a row vector with 200 length. In each cell there's a 50x50 uint8 image. I need to have the elements value of 50x50 image as well. So I want to basically read all the images (200 images) and stored the value of all images in a matrix. Can anyone tell me how can I do that? Thanks in advance.
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Image Analyst
Image Analyst 2017-2-15
I don't understand the question. You are reading in 200 images, which are 50 x 50 uint8 images, and storing them. It seems to be doing what you are asking for, so what's the problem? Do you want a 2-D array of cells instead of a 1-D row vector of cells? If so, why? And how many rows and columns do you want?

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Lav Palve
Lav Palve 2019-1-21
Store images in cell array
clc;
clear all;
close all;
arr = cell(25,77); % Create Cell array
k = 1;
% get 'zero' 25 image cell array
img_folder = ('E:\4th year\Project\Images\Chardatabase\Sample0'); % Enter name folder and its path
filenames = dir(fullfile(img_folder,'*.jpg')); % Read all image with specified extantion
Total_image = numel(filenames); % Count total image
for i=1:Total_image
j = 1;
for j=1:77
f = fullfile(img_folder,filenames(i).name); % Stroe ith image path
Output = imread(f); % read image
Output = imresize(Output,[11 7]);
Output = im2bw(Output);
Output = reshape(Output,[],77); % cell array divide by '77'
Output = im2double(Output);
arr{k,j} = Output(1,j); % get all pixel value of 'Output' image
end
k = k+1;
end
Vojtech Raska
Vojtech Raska 2020-3-13
编辑：Vojtech Raska 2020-3-13
Hi, i´m using this code to make 3-D matrix of 2-D MRI images, but if I load more than 3 images that every image besides firts three and the last one is just black and all values of that matrices are zeros. The images are uint8 format. I tried to trasfer them to double but it didn´t work. Is there some solution or the image matrices can be only three for each other?
clc; clear all; close all;
[Name, Path] = uigetfile('*.*', 'All Files (*.*)','MultiSelect','on');
if ~iscell(Name)
Name = {Name};
end
%% matrix
for i = 1:1:length(Name)
Nazev = Name(1,i);
Nazev = char(Nazev);
Img_info = [Path Nazev];
Img = imread(Img_info);
Img(:,:,i) = rgb2gray(Img);
end
Shreyas S
Shreyas S 2020-11-8
编辑：DGM 2023-2-12
im = {'image1.png','image2.png','image3.png'};
for k = 1:length(im)
image1 = im2double(imread(im{k}));
% ......
end

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