How to access names of pictures in a file?

18 views (last 30 days)
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

Accepted Answer

awezmm
awezmm on 3 Jan 2020
Edited: awezmm on 3 Jan 2020
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)

More Answers (1)

Marco Riani
Marco Riani on 3 Jan 2020
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}

Categories

Find more on File Operations in Help Center and File Exchange

Products


Release

R2018a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!