reading multiple images in a folder (imread)

Ok so I want to read 10 different images into matrices in Matlab. the images are saved as image001, image002 etc. up to image010. I tried this loop thinking it would work:

for n=1:10

image_{n}= imread(sprintf('image00%s.png',num2str(n)));

end

but it came up with the error:

??? Error using ==> strfind
Input strings must have one row.
Error in ==> imread at 340
if (strfind(filename, '://'))

it also would read the last image as image0010, which is not right. I then thought I could just do this:

for  r= 1:10
    sprintf('scan_%s', num2str(r)) = imread('*.png','png'); 
end

Because i thought that by putting "*.png" it would read all the images in the folder. But I go this error:

?? Error using ==> imread at 408
Can't open file "*.png" for reading;
you may not have read permission.

can someone see where I went wrong in my coding or suggest a better way to do it?

Thanks

[Udaynarayansingh Kushwaha]

% I have the code that read only 4 images and show using subplot function. But can someone suggest me that how I show more then 4 images in matlab without subplot function.

clc;

clear all;

for i=1:4

FileName=uigetfile({'.'});

im=imread(FileName);

subplot(2,2,i);

imshow(im);

end

Answer 1

[Walter Roberson]

for n=1:10
  images{n} = imread(sprintf('image%03d.png',n));
end

See also this FAQ and this one

[Jack Williams]

perfect so i assume the '%03d' makes 1 display as 001 and 10 010?

[mohammad aluounis]

how can i acsess one of thes images after read it

[Mohammed Hammouda]

@mohammad aluounis by calling its index.

images{1} for example is the image at index one in the cell array. This will give you the matrix of the image.

To see the actual image use

imshow(images{1}) 

And Allah knows best.

Take care bro.

[atyaf hekmat]

Mr. @Mohammed Hammouda Can you help me make a code to read images from a folder with subfolders in which there are multiple images. I want to get its features by eucledean distance...with all of my thanks

[Nathnael Esayas Bulti]

@atyaf hekmat did you manage to figure out how to read images from a folder with subfolders by any chance?

Answer 2

[Walter Roberson]

Your line

   filename = strcat('E:\EXTRACT\Motorcycle\Pos*.jpg',srcFiles(i).name);

Should not have the 'Pos*.jpg' part of the string.

I recommend that you learn to use fullfile()

[misbah khan]

hi i want to ask i am using the below code for reading multiple image but i want another folder to read the images in the same code how i modify this.i just want to read other folder not applying the same function for the second folder?

srcFile=dir('/MATLAB Drive/Published/*.bmp');
for i=1:length(srcFile)
filename=strcat('/MATLAB Drive/Published/', srcFile(i).name);
I=imread(filename);
im=rgb2gray(I);
path=strcat('/MATLAB Drive/Published/',srcFile(i).name);
imwrite(I,path);
end