How to read multiple jpg images in matlab

i have 250 jpg images stored at in_dir = 'C:\Users\DJDJ\Desktop\pic';

these pictures are arranged as following and named : image1 , image2, image3.....image250

I want to read all these images and processing them starting by image1 after processing go to process image2 .and after image3.to..image250

then saved the resultant images after preproceesing in a specific file,for example at out_dir = 'C:\Users\DJDJ\Desktop\pic output';.

How can i do this in matlab?

thank you in advance

Answer 1

[Niels]

you can use a for loop and save the image data in a cell:

replace png by the file type of your images. result will be a 1x250 cell array

for i= 1:250
    x{i}=imread(['image',num2str(i),'.png'])
end

>> save('image_Data','x')

[djamaleddine djeldjli]

thank you for answering my question like this, the problem of reading the images as : image1 ,image2....image250 is solved. but i am trying to read them from in_dir = 'C:\Users\DJDJ\Desktop\pic' and after to save them in out_dir = 'C:\Users\DJDJ\Desktop\pic output';

[djamaleddine djeldjli]

• * * * * * * * *

        my prog is :

        in_dir = 'C:\Users\DJDJ\Desktop\pic';

        out_dir = 'C:\Users\DJDJ\Desktop\pic output';

        for px = 1 : 250

                  fname=(['image',num2str(px),'.jpg']);

              current_image = imread(fullfile(in_dir, fname,'jpg'));

         %        imshow(current_image);
         % processing     %       out_image = some_function(current_image);

              out_image = current_image ; 

          % save output

               imwrite(out_image, fullfile(out_dir, fname,'jpg'));

        end

[djamaleddine djeldjli]

i have Error in loadsaveimg (line 11)

      current_image = imread(fullfile(in_dir, fname,'jpg'));

[Niels]

and what is the error? copy it pls

but as far as i can see you got an error because the jpg in your path come along twice in a row ( last argument 'jpg' in fullfile + in fname) the one in fullfile is wrong

replace line 11:

current_image = imread(fullfile(in_dir, fname));

[Image Analyst]

You need to use exist() to verify that the file exists first. Also, splitting up long lines into multiple lines would make things simpler. Because of that, I can see that you totally ignored my answer to use the code in the FAQ and used your own code, thus causing your problems. I urge you to again look at the FAQ and see what it's doing that you aren't, and then the code will work.

[djamaleddine djeldjli]

Thank you very much for your assistance.Now,it's working well.

I have replaced line 11 by current_image = imread(fullfile(in_dir, fname));

Answer 2

[Image Analyst]

You would use the first code sample in this entry of the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

[Maitham]

Hi Image Analyst. Sorry maybe my comment has not related to this topic. I need your help please with Strehl Ratio. I have a point source image and need to find and draw the Strehl Ratio for it. I would high appreciate it if you could help me please. Very kind regards Maitham

[Image Analyst]

Read this link and then attach your data in a new question. We can't do anything without data to work on.