How to access names of pictures in a file?

The name of the images have important information that I need to store in different variables for further processing.

For example the name of the image is: gh_368053_209864_19

And there are 8 images with different numbers. I need to access 368053 and store it in x separately and store 209864 in y. And I want to do this for all the images in the file in a loop. Store x and y in two different arrays.

I will also apply other functions to the accessed images!

How can this be done only with names of the images?

clear all
clc;
location = 'E:\ATR\*.JPG';        % folder in which your template images exists
img= imread('E:\ATR\gh_368053_209864_19.JPG');
ds = imageDatastore(location);    % Creates a datastore for all images in your folder
% fileNames={a.name};
while hasdata(ds) 
    temp = read(ds);              % read image from datastore
%   Image_name = temp.name;
%   figure, imshow(temp)
end

Answer 1

[awezmm]

if all the image names follow the pattern: gh_someNumber1_someNumber2_someNumber3

and you need to store someNumber1 and someNumber2 in separate variables:

% example array of file names:
example_img_names = {...
    'E:\ATR\gh_368053_209864_19.JPG',...
    'E:\ATR\gh_542191_032861_19.JPG',...
    'E:\ATR\gh_541666_417980_19.JPG'};

% make empty cell array to hold all the x numbers (all someNumber1's).
% initialize it with size of 1 x number of image names
all_x_numbers = cell(1,length(example_img_names));

% make empty cell array to hold all the y numbers (all someNumber2's).
% initialize it with size of 1 x number of image names
all_y_numbers = cell(1,length(example_img_names));

% for loop to go through all example_img_name
for i = 1:length(example_img_names)
   
    % get image name at current index
    curr_img_name = example_img_names{i};
    
    % break up filename into parts
    [filepath,name,ext] = fileparts(curr_img_name);
    
    % split filename by '_' character
    array_of_splits = strsplit(name, '_');
    
    % second element in split array will be someNumber1
    all_x_numbers{i} = array_of_splits{2};
    
    % third element in split array will be someNumber2
    all_y_numbers{i} = array_of_splits{3};
   
end
disp("x numbers:")
disp(all_x_numbers)
disp("y numbers:")
disp(all_y_numbers)

[maaham banu]

Thank you it worked :)

Answer 2

[Marco Riani]

Hi, please let me know if the code below works.

clear 
clc;
% location = folder in which your template images exists
location = 'D:\MATLAB\answers\images';

% ds = datastore for all images in your folder
ds = imageDatastore(location);

% Get all the filenames
temp = ds.Files;
% ltemp = number of images
ltemp=length(temp);
% maxFileNames = maximum number of filenames in the strings of File Names
maxFileNames=5;
% X= cell which will contain in column 1 first name,
%                              in column 2 second name,
% ....
X=cell(ltemp,maxFileNames);

for i=1:ltemp
    % FullName = full name with path
    FullName=temp{i};
    % Extract just the name (e.g. name='DSC_2834_34567')
    [~,name]=fileparts(FullName);
    % Find the position of "_" in the filename
    posUs=regexp(name,'_');
    
    % We assume that the first name is after "_" sign
    if ~isempty(posUs)
        lname=length(name);
        % pad posUs with length(name) at the end to make sure that every time you have the
        % same length
        posUsSL=[posUs (lname+1)*ones(1,maxFileNames+2-length(posUs))];
        % Insert in row i col j of cell X the filename
        for   j=1:maxFileNames
            X{i,j}=name(posUsSL(j)+1:posUsSL(j+1)-1);
        end
    end
end

% In my case (given that I specified maxFileNames=5)
% 
% temp =
% 
%   9×1 cell array
% 
%     {'D:\MATLAB\answers\images\DSC_2834_34567.jpg'    }
%     {'D:\MATLAB\answers\images\DSC_2835.jpg'          }
%     {'D:\MATLAB\answers\images\DSC_2836.jpg'          }
%     {'D:\MATLAB\answers\images\DSC_2837.jpg'          }
%     {'D:\MATLAB\answers\images\DSC_2911_78976_876.jpg'}
%     {'D:\MATLAB\answers\images\DSC_2914.jpg'          }
%     {'D:\MATLAB\answers\images\DSC_2921_6785.jpg'     }
%     {'D:\MATLAB\answers\images\DSC_2922_9843.jpg'     }
%     {'D:\MATLAB\answers\images\DSC_2923_8765.jpg'     }
%
% 
% X =
% 
%   9×5 cell array
% 
%     {'2834'}    {'34567' }    {1×0 char}    {1×0 char}    {1×0 char}
%     {'2835'}    {1×0 char}    {1×0 char}    {1×0 char}    {1×0 char}
%     {'2836'}    {1×0 char}    {1×0 char}    {1×0 char}    {1×0 char}
%     {'2837'}    {1×0 char}    {1×0 char}    {1×0 char}    {1×0 char}
%     {'2911'}    {'78976' }    {'876'   }    {1×0 char}    {1×0 char}
%     {'2914'}    {1×0 char}    {1×0 char}    {1×0 char}    {1×0 char}
%     {'2921'}    {'6785'  }    {1×0 char}    {1×0 char}    {1×0 char}
%     {'2922'}    {'9843'  }    {1×0 char}    {1×0 char}    {1×0 char}
%     {'2923'}    {'8765'  }    {1×0 char}    {1×0 char}    {1×0 char}