How to store images in a single array or matrix
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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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채택된 답변
Image Analyst
2013년 5월 27일
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
2017년 6월 28일
편집: Ganesh Gajavelli
2017년 6월 28일
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!
추가 답변 (5개)
Azzi Abdelmalek
2013년 5월 27일
f=dir('*.jpg')
files={f.name}
for k=1:numel(files)
Im{k}=imread(files{k})
end
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Abhishek Singh
2019년 7월 2일
@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.
Shelly Smith
2017년 2월 15일
편집: Image Analyst
2017년 2월 15일
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
2017년 2월 15일
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?
Lav Palve
2019년 1월 21일
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
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Vojtech Raska
2020년 3월 13일
편집: Vojtech Raska
2020년 3월 13일
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
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