I am a beginner-level programmer. Kindly help me to count the number of images from multiple folders at once

All the folders in the below path contains images. I want to count number of images in each folder and need to get the output in .csv format.

[Walter Roberson]

It would be easier if all of the images had the same file extension, or if at least it could be assumed that any file inside the folders is definitely an image. Otherwise, it becomes necessary to test every file in every folder in order to determine whether each can be read as an image -- and that doesn't really tell you how many images are in each folder, only how many of them could be read by the methods the code tried.

For example some of the folders might contain "raw" images produced by cameras that you do not expect, so you might not know that a (for example) .nri file was a Nokia Raw Image file from the Nokia 3060 series of phones -- it would be an image and so would have to be counted, but the same directory might contain a .nbd file which is a Nokia Backup archive and those are not images and so should not be counted....

[Akhil Narayanan]

All the image files inside these folders ar ein .jpg extension.. there are varying in numbers in each folders i.e,e i want to know how much image files are in each folder.. I am trying myself to write a program for this, but it will be great if i get a logic needed for running the program

[KSSV]

Do all the folders have only images? Or some other files too are present?

[Akhil Narayanan]

no just .jpg files. No other files are present.

Answer 1

[Walter Roberson]

dinfo = dir(fullfile('*', '*.jpg'));
folders = {dinfo.folder};
[~, basefolder] = fileparts(folders);
[G, folder_name] = findgroups(basefolder);
image_count = accumarray(G(:), 1);
results = table(folder_name, image_count);

writetable(results, 'OutputFileName.csv');

[Akhil Narayanan]

First of all , many thanks. But I am getting the error

Reference to non-existent field 'folder'.

I am using MATLAB 2013a.

[Walter Roberson]

Unfortunately that makes the code more difficult. You should consider upgrading.

if isunix()
    %for demonstration purposes only, position us to some images
    projectdir = fullfile(matlabroot, 'toolbox', 'images');
    cd(projectdir);
end

dinfo = dir('*');
dinfo(ismember({dinfo.name}, {'.', '..'})) = [];  %remove . and ..
folder_name = {dinfo.name}.';
num_folder = length(folder_name);
image_count = cell(num_folder, 1);

for K = 1 : num_folder
   finfo = dir( fullfile(folder_name{K}, '*.jpg') );
   image_count{K} = length(finfo);
end

results = [folder_name, image_count];

results

results = 11×2 cell array
    {'Halide.rights'}    {[ 0]}
    {'builtins'     }    {[ 0]}
    {'colorspaces'  }    {[ 0]}
    {'deep'         }    {[ 0]}
    {'icons'        }    {[ 0]}
    {'images'       }    {[ 0]}
    {'imdata'       }    {[38]}
    {'imdemos'      }    {[ 0]}
    {'imuitools'    }    {[ 0]}
    {'iptformats'   }    {[ 0]}
    {'iptutils'     }    {[ 0]}

Answer 2

[Image Analyst]

Do you want the count broken down by how many are in each folder? Or do you just want to count the numbre in each folder and give a grand total, like this:

topLevelFolder = pwd; % or 'C:\my folder' or whatever you want.
filePattern = fullfile(topLevelFolder, '**\*.jpg');
% Get list of all JPG files in the top level folder and all subfolders below that.
fileList = dir(filePattern)
% Count them and put the count into the numFiles variable.
numFiles = length(fileList)

** may not work in your antique version though. Not sure when the ** was introduced.