How to read multiple jpg images in a loop?

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archana
archana el 4 de Mzo. de 2014
Movida: DGM el 20 de Dic. de 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?
  17 comentarios
Anil Varma
Anil Varma el 13 de Dic. de 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 el 3 de Dic. de 2020
Movida: DGM el 20 de Dic. de 2022
how to display five images in matlab

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Respuesta aceptada

Dishant Arora
Dishant Arora el 4 de Mzo. de 2014
  6 comentarios
archana
archana el 6 de Mzo. de 2014
Editada: archana el 6 de Mzo. de 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 el 6 de Mzo. de 2014
Use the builtin cov to get the covariance matrix.

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Más respuestas (5)

Karthik Karri
Karthik Karri el 6 de Mzo. de 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.

chaitra naveen
chaitra naveen el 20 de Mzo. de 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 el 27 de Nov. de 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 el 30 de Jun. de 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.
  1 comentario
shital shinde
shital shinde el 21 de Feb. de 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 el 6 de Mzo. de 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
  8 comentarios
Walter Roberson
Walter Roberson el 29 de Nov. de 2016
Isha Pandya, please show your current code and describe what difficulty you are observing.
Zahoor abbas
Zahoor abbas el 9 de Jul. de 2018
How I can access the images from two folders by using one for loop

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