How to read multiple jpg images in a loop?

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archana
archana 2014-3-4
移动：DGM 2022-12-20
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 2019-12-13
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 2020-12-3
移动：DGM 2022-12-20
how to display five images in matlab

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采纳的回答

Dishant Arora
Dishant Arora 2014-3-4
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archana
archana 2014-3-6
编辑：archana 2014-3-6
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 2014-3-6
Use the builtin cov to get the covariance matrix.

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更多回答（5 个）

Karthik Karri
Karthik Karri 2014-3-6
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.
chaitra naveen
chaitra naveen 2017-3-20
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 2017-11-27
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 2019-6-30
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 2020-2-21
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 2014-3-6
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 2016-11-29
Isha Pandya, please show your current code and describe what difficulty you are observing.
Zahoor abbas
Zahoor abbas 2018-7-9
How I can access the images from two folders by using one for loop

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