How to access multiple images in a single code ?

Hello Mathworks,

My question might sound a little bit odd but what I meant to say was if I have a group of 25 images in a single folder and if I have to calculate say max pixel or min pixel of every image then do I need to write min(x1) min(x2) ..... min(x25) or is there anyway with which I could write a code once and repeat it for other 24 images ?

I have had this doubt for quite a long time so now I am waiting to see some interesting facts :)

Thanks All

Answer 1

[Sean de Wolski]

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

FAQ 4.12

[Harsha Vardhan Rao Avunoori]

That was super fast Sean.

Thanks for the help :)

[Harsha Vardhan Rao Avunoori]

I took the example code from the link and when I ran it I found this error

??? Conversion to cell from uint8 is not possible.

jpegFiles = dir('*.jpg');

numfiles = length(jpegFiles);

mydata = cell(1, numfiles);

for k = 1:numfiles

mydata{k} = imread(jpegFiles(k).name);

end

[Sean de Wolski]

What line was the error on? I don't see anything here that would throw that error.

[Harsha Vardhan Rao Avunoori]

Line 6

mydata(k) = imread(jpegFiles(k).name);

[Sean de Wolski]

Where's Waldo MATLAB Style:

Look for the subtle but lethal difference between the line in the previous comment and your comment before!

[Harsha Vardhan Rao Avunoori]

Yep I figured it now.But how do I convert it into gray ???rgb2gray() doesn't work on 'cell' class ?

[Sean de Wolski]

mygraydata = cellfun(@(x)rgb2gray(x),mydata,'uni',false);

[Harsha Vardhan Rao Avunoori]

Sean you are an awesome guy :) How do you know all these ???

[Harsha Vardhan Rao Avunoori]

Okay now since I have loaded all my gray 22 images into one single variable.I got another question. How do I access each of them ? As mygraydata is 1 x 22 cell and each cell contains an image of size 408 x 704. I have tried converting this cell to matrix using cell2mat() but still I cannot call single image to find it's maximum value.

[Sean de Wolski]

gray3Dimage = cell2mat(reshape(mygraydata(:),[1 1 22]));