How to read multiple jpg images in a loop?

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archana
archana le 4 Mar 2014
Déplacé(e) : DGM le 20 Déc 2022
hello, i am a novice user in matlab my question is: i have stored some 100s of images in some folder and i want to read it one-by-one.how can i do this?
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Anil Varma
Anil Varma le 13 Déc 2019
showing error
Error using randi
First input must be a positive scalar integer value IMAX, or two integer values [IMIN IMAX] with IMIN
less than or equal to IMAX.
Error in test (line 9)
idx=randi(n);
shweta banait
shweta banait le 3 Déc 2020
Déplacé(e) : DGM le 20 Déc 2022
how to display five images in matlab

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Dishant Arora
Dishant Arora le 4 Mar 2014
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archana
archana le 6 Mar 2014
Modifié(e) : archana le 6 Mar 2014
sir,actually i want to obtain the covarience matrix of all these read images...for same i wrote a code but there i worked on each image seperatly (i.e. reading convrting to gray and the resized it) because of which code became verry bulky ,now with your guidlines i modified sem for loop reading. now what i supposed to do is 1st i should convert it to gray and then resize all..but fact is yet i didnot reached to covarience matrix stage...:( apologize me for mistake if any
Dishant Arora
Dishant Arora le 6 Mar 2014
Use the builtin cov to get the covariance matrix.

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Plus de réponses (5)

Karthik Karri
Karthik Karri le 6 Mar 2014
You can rename all images like..im1,im2,im3.....im100. To read 100 images one by one, run a loop 100 times with i as variable from 1 to 100 and in imread, m=imread(['folder_path\im' num2str(i) '.jpg']). I hope I answered your question.
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archana
archana le 6 Mar 2014
thanks its working.....:)

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chaitra naveen
chaitra naveen le 20 Mar 2017
can you please help me out to read 100's of images from folder to matlab and resize them to 100x100.
Muhammad Sohail
Muhammad Sohail le 27 Nov 2017
filelist = dir('Training data');
for i=1 : length(filelist)
for i=1 : length(filelist)
filename = filelist(i);
if ~strcmp(filename.name , '.') && ~strcmp(filename.name , '..')
filename.name
end
end
Haseeb Hassan
Haseeb Hassan le 30 Juin 2019
for i=1:16; % we have 16 images we have in or folder
clc;clear;
images ='C:\Users\Haseeb\Desktop\input\for_loop_input';
jpgfiles=dir(fullfile(images,'\*.jpg*'));
n=numel(jpgfiles(i));
im=jpgfiles(i).name
im1=imread(fullfile(images,im));
imshow(im1);
end
Here is the simple and short code, which will acces your images from your folder in a sequence.
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shital shinde
shital shinde le 21 Fév 2020
Actually it gives error as
Array indices must be positive integers or logical values.
n=numel(jpgfiles(i)); // for this line.
will you tell me why ?

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Xylo
Xylo le 6 Mar 2014
You can do this easily..... before doing this program, you have to keep all of your image in a folder and rename them by any common char+number concatenation form (like a1.jpg, a2.jpg,a3.jpg....). after that you just use strcat() function for reading the path name, and then read the images.
for i=1:10 %suppose there are 10 image
file_name=dir(strcat('J:\multimedia\photo\')); % the path tht u hv imges
im=imread(strcat('J:\multimedia\photo\',file_name(i).name));
imtool(im);
end
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Walter Roberson
Walter Roberson le 29 Nov 2016
Isha Pandya, please show your current code and describe what difficulty you are observing.
Zahoor abbas
Zahoor abbas le 9 Juil 2018
How I can access the images from two folders by using one for loop

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